Published: 2024 | Last updated: June 2026
Introduction
The Lehigh Defense Tipped Maximum Expansion completes the third distinct terminal performance philosophy within Lehigh’s hunting bullet lineup covered on this site. The Tipped Controlled Chaos sheds 5-7 curled petals that separate from the shank. The Tipped Xtreme Chaos sheds 4 straight petals that also separate. The Tipped Maximum Expansion is different from both: its 4 petals expand radially but remain attached to the shank, producing a single unified bullet with a dramatically widened front diameter rather than multiple separate wound channels.
This distinction is fundamental to understanding the Maximum Expansion’s design intent. Where the Chaos lines pursue dual wound channels (petals creating lateral trauma, shank creating deep linear penetration simultaneously), the Maximum Expansion pursues a single wound channel of maximum possible diameter. The 2x diameter expansion documented in the original article means a .264-inch bullet expands to approximately .528 inch across the petal span, and a .308-inch bullet expands to approximately .616 inch. These are among the widest wound diameters achievable from any expanding rifle bullet, markedly wider than the 1.5-1.8x expansion typical of bonded lead-core hunting bullets.
The caliber range (.264 to .358 inches) is narrower than the Xtreme Chaos (.224-.338) but similar to the Controlled Chaos (.264-.358 with slightly different endpoints). The Maximum Expansion is exclusively a hunting bullet – there is no training or competition application for its design. Its 1,500 fps activation threshold matches the Chaos lines and gives it meaningful extended-range expansion advantage over the TTSX and GMX at 500-600 yards, where the 6.5 Creedmoor may retain only 1,600-1,900 fps. At those velocities, the Maximum Expansion is above its threshold while the TTSX and GMX are marginal.
The design philosophy targets hunters who want the widest possible wound channel from a single unified penetrating mass, prioritizing rapid large-diameter tissue disruption over the multi-channel approach of the Chaos lines. For deer-sized game where immediate large-caliber trauma produces fast incapacitation, the Maximum Expansion’s wide opened-petal cross-section has appeal. For heavier game where deep straight penetration matters as much as wound width, the retained 99% weight (all petals stay on the bullet) provides full penetrating mass while the wide expanded diameter maintains hydrostatic shock.
As with the preceding Lehigh articles, the competitor BC comparison figures are accurate for the TTSX (0.295-0.586) and GMX (0.245-0.540), continuing the positive data quality pattern documented across the Lehigh series. The Cutting Edge ER Raptor BC range (0.203-0.550) is noted by the original article; verify against the dedicated Cutting Edge article.
Two data quality flags within the Tipped Maximum Expansion’s own table require attention. First, the .308-inch 115-grain at BC 0.326 and the .308-inch 155-grain at BC 0.324 show nearly identical BCs for substantially different weights in the same caliber. A 40-grain weight difference at the same diameter should produce meaningfully different BCs, not near-identical ones. One or both figures likely contain an error; verify at lehighdefense.com. Second, the 120-grain .264-inch shows BC 0.475, the same figure documented in the Tipped Controlled Chaos article for the same caliber and weight. Two different bullets at the same caliber and weight from the same manufacturer with identical BCs warrants verification – this may reflect that the Maximum Expansion and Controlled Chaos use similar ogive profiles in this weight class, or it may be a data transcription coincidence.
For trajectory context on the most common pairings for this bullet, see the 6.5 Creedmoor ballistics guide, 308 Winchester ballistics guide, and 270 Winchester ballistics guide.
Disclaimer: Reloading is an inherently dangerous activity. Always consult current published load data from Lehigh Defense or other reputable sources before loading any cartridge. Monolithic copper bullets generate higher pressures than lead-core bullets at the same charge weight – always start 10% below the Lehigh-published minimum. Never use lead-core bullet data for monolithic designs. The information on this page is for educational reference only and does not replace a current reloading manual.
Technical Characteristics
4 attached petals – the defining design difference from the Chaos lines: The Maximum Expansion’s petals are machined as part of the bullet’s forward section but remain attached to the shank after expansion. Under impact, hydraulic pressure forces the four petals to fold backward and outward to approximately 2x the original bullet diameter, creating an umbrella-shaped cross-section. The petals do not separate; they remain attached, producing a single bullet mass with maximum cross-sectional area rather than multiple separate projectile fragments.
This non-separating petal design gives the Maximum Expansion a different weight retention profile than the Chaos lines. The Chaos products retain 70-80% shank mass after petal separation; the Maximum Expansion retains approximately 99% because there is no material loss – the petals stay on the bullet. This makes the Maximum Expansion equivalent to conventional monolithic copper designs like the Barnes TTSX and Hornady GMX in weight retention terms (both also near 99-100%), while achieving greater expansion diameter than either.
Polymer tip initiates at 1,500 fps: The same low activation threshold documented for the Tipped Controlled Chaos and Tipped Xtreme Chaos. The 1,500 fps threshold applies across all Lehigh Defense tipped designs regardless of terminal performance type, making the Maximum Expansion expandable at velocities where the TTSX and GMX’s 1,800 fps threshold may not provide reliable expansion. This is the Maximum Expansion’s primary advantage over the TTSX and GMX at long range.
2x diameter expansion: The 2x expansion claim means .264-inch expands to approximately .528 inch and .308-inch expands to approximately .616 inch across the petal span. These figures exceed the typical 1.5-1.8x expansion of lead-core bonded hunting bullets and the comparable expansion of the TTSX. They require independent verification at lehighdefense.com, as bullet expansion diameter varies with impact velocity and medium, but the design intent is clearly maximum expansion rather than controlled moderate expansion.
The practical implication of 2x expansion is meaningful at deer and elk hunting ranges and velocities. A .308-inch bullet with a fully expanded .616-inch petal span creates a permanent wound channel approximately equivalent in cross-section to a .60-caliber solid – substantially wider than any lead-core hunting bullet expanding to 1.5-1.8x at the same caliber. For lung shots on deer, this wide initial wound cavity produces rapid tissue disruption and potentially faster incapacitation than a narrower wound channel from a conventional expanding bullet. The attached petals prevent the bullet from shedding mass, so the full 155-grain or 200-grain bullet mass continues through the animal rather than depositing the expanded lead core and jacket fragments in the near-side tissue.
Grooved design reduces fouling: The pressure-relieving grooves in the bearing surface are documented across Lehigh’s copper bullet lineup. The 15-20% fouling reduction claim is directional and consistent with published data for copper bullet pressure-relief grooves, though the specific percentage is difficult to independently verify.
Lead-free: Fully compliant with California condor zone regulations and all lead-restricted hunting areas.
Pressure considerations: Same as every monolithic copper design. Use Lehigh’s own published data; begin 10% below the published minimum; never substitute lead-core charge weights.
Ballistics and Performance
The original article’s stated BC range (0.324-0.475) is internally consistent with the table’s values. However, the near-identical BCs for the .308-inch 115-grain (0.326) and 155-grain (0.324) are the primary data quality flag in this article. A 40-grain weight difference in the same caliber should produce meaningfully different BCs – the heavier bullet’s higher sectional density would normally produce a higher BC, not a slightly lower one. One possible explanation is that the 115-grain entry uses a different ogive profile (potentially longer for its weight) that compensates for the weight disadvantage, but this requires verification at lehighdefense.com.
The 120-grain .264-inch at BC 0.475 and SD 0.246 covers 6.5 Creedmoor and 6.5 PRC for deer and antelope. BC 0.475 matches the Tipped Controlled Chaos’s figure for the same weight and caliber exactly. The SD 0.246 at 120 grains provides adequate sectional density for deer-sized game, though hunters pursuing elk with the 6.5mm Maximum Expansion should verify that the 120-grain weight provides adequate penetration depth after the wide petal expansion on heavy-muscled game. The 2x expansion at .264-inch caliber produces a .528-inch expanded diameter, which is exceptionally wide for a 6.5mm bullet and likely more than adequate for rapid incapacitation on deer.
The 125-grain .277-inch at BC 0.406 and SD 0.233 covers 270 Winchester and 270 WSM for deer and elk.
The 135-grain .284-inch (7mm) at BC 0.420 and SD 0.239 covers 7mm Remington Magnum and 7mm PRC for elk and large game.
The 115-grain and 155-grain .308-inch at BC 0.326 and 0.324 cover 308 Winchester for deer and elk. As noted, the near-identical BCs for these two weights are flagged for independent verification.
The 200-grain .358-inch at BC 0.331 and SD 0.223 covers 35 Whelen for large North American game. The BC 0.331 for .358-inch at 200 grains is modest but appropriate for this large-bore caliber. The 2x expansion at .358-inch produces approximately .716-inch expanded diameter – the widest wound diameter of any entry in this table, and a figure that makes the Maximum Expansion in .358-inch caliber a serious choice for hunters who specifically want maximum tissue disruption from a large-bore cartridge. The SD 0.223 is adequate for large game though not exceptional, and combined with 99% weight retention the 200-grain penetrates predictably after the wide initial expansion.
Expert Ballistics Table – Lehigh Defense Tipped Maximum Expansion Variants
Data from Lehigh Defense specifications. BCs are G1. The near-identical BCs for 115-grain (.326) and 155-grain (.324) .308-inch are flagged as requiring independent verification at lehighdefense.com.
| Diameter (inches) | Weight (grains) | BC (G1) | Sectional Density | Application |
|---|---|---|---|---|
| .264 | 120 | 0.475 | 0.246 | Deer in 6.5 Creedmoor |
| .277 | 125 | 0.406 | 0.233 | Elk in 270 Winchester |
| .284 | 135 | 0.420 | 0.239 | Large game in 7mm Remington Magnum |
| .308 | 115 | 0.326 | 0.173 | Deer in 308 Winchester (verify BC) |
| .308 | 155 | 0.324 | 0.233 | Elk in 308 Winchester (verify BC) |
| .358 | 200 | 0.331 | 0.223 | Large game in 35 Whelen |
Comparison Bullets
The original article’s comparison set is the same as the preceding Lehigh articles: Cutting Edge ER Raptor, Barnes TTSX, Hornady GMX, Nosler E-Tip, and Lapua Naturalis. The TTSX (0.295-0.586) and GMX (0.245-0.540) BCs are again accurately cited, the fourth consecutive Lehigh article with correct competitor figures for these two bullets.
The within-Lehigh comparison is the most practically useful context for understanding the Maximum Expansion. The Tipped Controlled Chaos‘s 5-7 separating petals create multiple wound channels; the Maximum Expansion’s 4 attached petals create a single wound channel of maximum diameter. The Tipped Xtreme Chaos‘s 4 straight separating petals are between the two in design – separate petals like the Controlled Chaos, but fewer. The Maximum Expansion’s 99% weight retention makes it the closest to conventional TTSX/GMX performance while achieving wider expansion than either. The Lehigh Controlled Fracturing, Lehigh Xtreme Defense, and Lehigh Match Solid round out Lehigh’s product catalog beyond the tipped hunting designs covered in this site’s dedicated articles. The Cutting Edge CURX and Cutting Edge HG Solid are further fragmenting monolithic comparison points from the closest competitor brand.
The Lehigh Defense Controlled Chaos (untipped) provides a further within-brand reference point, representing the petal-separation approach without the polymer tip.
Comparison Table – Monolithic Copper Hunting Bullets
| Bullet | BC Range | Petal Design | Weight Retention | Activation |
|---|---|---|---|---|
| Lehigh TME | 0.324-0.475 | 4 attached | 99% | 1,500 fps |
| Lehigh Tipped CC | 0.267-0.475 | 5-7 separated | 70-80% shank | 1,500 fps |
| Lehigh Tipped XC | 0.295-0.482 | 4 separated | Shank only | 1,500 fps |
| Barnes TTSX | 0.295-0.586 | None (unified) | 95-100%+ | 1,800 fps |
| Hornady GMX | 0.245-0.540 | None (unified) | 95%+ | 1,800 fps |
| Lapua Naturalis | 0.316-0.545 | None (unified) | 99%+ | 1,800 fps |
Applications and Practical Aspects
Deer and antelope (120 grains, 6.5mm): 6.5 Creedmoor and 6.5 PRC for deer-sized game where maximum wound diameter produces rapid incapacitation. The 6.5 PRC ballistics guide provides trajectory data relevant to the 120-grain TME’s extended-range performance in that cartridge. Hodgdon H4350 and Alliant Reloder 23 are standard powder choices.
Deer and elk (.277-inch, 125 grains): 270 Winchester and 270 WSM for mid-sized large game. Hodgdon H4350 and Alliant Reloder 22 are standard choices.
Elk and large game (.284-inch, 135 grains): 7mm Remington Magnum and 7mm SAUM for elk. Hodgdon H4831SC, Alliant Reloder 26, [IMR 7828 SSC](https://myreloading.com/imr-7828-ssc/, and Hodgdon Retumbo are standard choices.
308 Winchester for deer and elk (.308-inch, 115-155 grains): 308 Winchester, 30-06 Springfield, and 300 Winchester Magnum for the most common North American hunting calibers in .30 bore. The 155-grain is the more appropriate elk weight; the 115-grain is light for elk but adequate for deer-sized game at appropriate impact velocities. Note that the 115-grain .308-inch at this relatively light weight for the bore will require appropriate twist rate verification – most .308 Winchester barrels with 1:10-1:12 twist stabilize 150-168 grain bullets optimally; the 115-grain may be less efficiently stabilized at the longer-for-weight monolithic geometry. [Hodgdon Varget](https://myreloading.com/hodgdon-varget/, [Hodgdon H4350](https://myreloading.com/hodgdon-h4350/, and Hodgdon H4895 are standard .308 Winchester choices.
Large game (.358-inch, 200 grains): 35 Whelen for large North American game where the .358-inch caliber’s diameter advantage compounds the Maximum Expansion’s 2x expansion to produce an extremely wide wound channel. Alliant Reloder 22, Hodgdon H4831SC, Alliant Reloder 33, and Vihtavuori N560 are standard choices.
California and lead-restricted jurisdictions: The Maximum Expansion is fully lead-free monolithic copper, compliant with California condor zone regulations and all lead-restricted hunting areas.
Reloading
Primers: Federal 210 and CCI 200 standard large rifle primers for most applications. Federal 215 magnum primers for 7mm Remington Magnum, 270 WSM, and 300 Winchester Magnum. CCI 250 is a further magnum primer option.
Cases: Premium brass from Lapua, Norma, or Peterson. The Maximum Expansion’s monolithic copper construction warrants quality brass for consistent neck tension and case life.
Seating depth: 0.010-0.050 inches off the lands per standard hunting bullet guidance. Verify with Lehigh’s published data for each specific weight and caliber.
Powder Selection by Application:
| Application | Caliber | Bullet Weight | Recommended Powders |
|---|---|---|---|
| Deer | 6.5 Creedmoor | 120 gr | Hodgdon H4350, Alliant Reloder 23, Alliant Reloder 26 |
| Elk | 270 Win | 125 gr | Hodgdon H4350, Alliant Reloder 22, IMR 4350 |
| Large game | 7mm Rem Mag | 135 gr | Hodgdon H4831SC, Alliant Reloder 26, Alliant Reloder 22 |
| Elk | 308 Win | 155 gr | Hodgdon Varget, Hodgdon H4350, Hodgdon H4895 |
Reloading Parameters Summary:
| Parameter | Guideline |
|---|---|
| Neck tension | 0.002-0.004 inch interference |
| Seating depth | 0.010-0.050 inch off lands; verify with Lehigh data |
| Pressure start | 10% below monolithic-specific minimum |
| Activation velocity | 1,500 fps minimum |
| Weight retention | 99% (petals attached) |
Frequently Asked Questions
Q: How does the Maximum Expansion differ from the Controlled Chaos and Xtreme Chaos?
A: The fundamental difference is petal behavior on impact. The Controlled Chaos and Xtreme Chaos petals separate from the shank on impact, creating multiple separate projectile fragments that produce multiple lateral wound channels while the shank penetrates centrally. The Maximum Expansion’s petals remain attached, folding back against the shank to produce a single unified bullet with dramatically widened cross-section. The Maximum Expansion’s wound channel is wider but singular; the Chaos lines’ wound channels are narrower but multiple. For large-diameter single-channel trauma, choose the Maximum Expansion. For multiple-channel fragmentation, choose a Chaos variant.
Q: The 115-grain and 155-grain .308-inch entries show nearly identical BCs (0.326 and 0.324). Is this accurate?
A: This is unusual and requires independent verification at lehighdefense.com. A 40-grain weight difference in the same caliber should produce meaningfully different BCs. One possible explanation is that the 115-grain entry uses a significantly longer ogive profile relative to its weight, which would improve its BC independently of the weight difference. Another possibility is that one or both figures contain a transcription error in the original article. Use these BC figures for general planning only; verify the current published values before using them in precision trajectory calculations.
Q: How does the Maximum Expansion compare to the Barnes TTSX in terminal performance?
A: Both retain near-100% bullet weight (99% for the Maximum Expansion, 95-100%+ for the TTSX). The primary differences are: expansion diameter (Maximum Expansion’s 2x is wider than the TTSX’s typical 1.5-1.8x); activation threshold (1,500 fps versus 1,800 fps, giving the Maximum Expansion an expansion reliability advantage at extended range); and construction method (machined copper versus swaged copper). Both are excellent choices for lead-free hunting, with the Maximum Expansion specifically emphasizing maximum wound diameter and the TTSX emphasizing maximum penetration through heavy bone from a unified expanding mushroom.
A practical comparison at 400 yards in 6.5 Creedmoor illustrates the threshold difference. At 400 yards, a 120-grain load at approximately 2,700 fps muzzle velocity typically retains about 2,000-2,100 fps. The Maximum Expansion at 1,500 fps threshold is well above its activation point; the TTSX at 1,800 fps is also above its threshold but with less margin. At 600 yards where retained velocity may be 1,700-1,800 fps depending on the specific load, the Maximum Expansion maintains reliable expansion while the TTSX approaches its lower limit. For deer hunters who routinely take 500-600 yard shots, this threshold difference is practically meaningful.
Q: Is 99% weight retention accurately stated for the Maximum Expansion?
A: Yes, and it follows logically from the design. Because the four petals remain attached to the shank rather than separating, there is no material loss from the bullet – the full weight continues downrange in unified form. This contrasts with the Chaos lines where petal separation produces 70-80% shank retention by design. The 99% figure is consistent with what any well-made monolithic copper bullet achieves when no material is lost during expansion.
Q: Can the Maximum Expansion be used for California hunting?
A: Yes. It is fully lead-free monolithic copper and compliant with California condor zone regulations and all other lead-restricted hunting jurisdictions. Lehigh Defense’s entire lineup is lead-free by design.
Q: Between the Maximum Expansion and the Tipped Controlled Chaos, which should I choose for elk?
A: Both are effective for elk-sized game, and the choice depends on your terminal performance philosophy. The Maximum Expansion’s attached petals produce a very wide single wound channel with 99% weight penetrating as a unified mass – excellent for broadside shots where maximum cross-sectional trauma through the vitals is the objective. The Controlled Chaos’s separated petals create multiple wound channels simultaneously, which may be more effective on raking shots where the petals spread the trauma across a wider tissue volume. For straightforward broadside ethical shots at reasonable range, either performs well on elk; the choice is philosophical rather than practical for most hunting scenarios.
Conclusion
The Lehigh Defense Tipped Maximum Expansion completes the trio of Lehigh’s tipped hunting bullet designs covered on this site, occupying the maximum-expansion-diameter niche that the Chaos lines do not specifically target. Its 4 attached petals produce a 2x diameter expansion with 99% weight retention, prioritizing the widest possible single wound channel over the multi-channel fragmentation approach of the Chaos lines.
Across the three Lehigh tipped hunting bullet articles on this site – Controlled Chaos, Xtreme Chaos, and Maximum Expansion – the positive competitor BC data pattern holds. The TTSX (0.295-0.586) and GMX (0.245-0.540) are again correctly cited in this article, confirming that Lehigh’s research standards for competitive comparison data are consistently higher than most of the other bullet manufacturers in this series. The primary data flags in this article are internal – the near-identical .308-inch BCs for substantially different weights (115-grain at 0.326 versus 155-grain at 0.324) and the identical 6.5mm 120-grain BC between this article and the Controlled Chaos article (both at 0.475). Both of these are more likely to reflect data limitations in the original source than deliberate errors, but they warrant verification at lehighdefense.com before use in precision trajectory work.
Choose the Maximum Expansion if: you want maximum wound diameter from a lead-free monolithic copper bullet; you want 99% weight retention combined with wider expansion than the TTSX or GMX; or you hunt deer-sized game where maximum trauma diameter from a single expanding mass produces the fastest ethical harvest.
Choose the Tipped Controlled Chaos instead if: you want multiple separate wound channels from petal fragmentation simultaneously with deep shank penetration – a different terminal performance strategy that some hunters prefer for raking shots on large game.
Choose the Barnes TTSX or Hornady GMX if: you specifically want the broadest published handloading data archive in lead-free copper hunting bullets, or if your shots are typically close-range where the 1,800 fps threshold is reliably met and the BC difference is less significant.
Choose something else if: for any hunting application requiring lead-core bullets, the Nosler AccuBond, Hornady ELD-X, and Berger Elite Hunter are lead-core alternatives with extensive handloading data. For lead-free hunters comparing the Maximum Expansion against competing products, the Federal Trophy Copper, Winchester Copper Extreme Point, and Barnes LRX are further lead-free monolithic alternatives at similar price tiers.
Disclaimer: Reloading monolithic copper bullets requires caution. Never substitute lead-core bullet charge data; always use Lehigh Defense-published data specific to the Tipped Maximum Expansion. Lead-free; compliant with California and all lead-restricted areas. Wear eye protection at all times. The author and myreloading.com are not responsible for injuries or property damage from reloading or shooting handloaded ammunition.
Have you hunted with the Lehigh Defense Tipped Maximum Expansion? Leave a comment with your weight, cartridge, range, and what you observed on game. Notes on expanded bullet recovery diameter compared to the documented 2x figure are especially useful.
The expanded geometry of the Maximum Expansion deserves visualization. After impact, the four petals fold backward and outward along the shank, creating a broad umbrella or flower shape with the petal tips at maximum radial extension. This produces a wide forward-facing cross-section that cuts a large permanent wound channel as the bullet passes through. The shank behind the petals is narrower and continues for deep penetration. This is different from a mushrooming lead-core bullet, where the expanded tip pushes outward in a rounded dome; the Maximum Expansion’s petals produce a wider, more exaggerated radial spread than conventional mushrooming while the attached geometry ensures the full bullet mass continues to penetrate.
