Introduction
Discover the Lehigh Defense Maximum Expansion (ME), a lead-free bullet engineered for hunters who demand ultimate wound channel creation and controlled penetration. Launched by Lehigh Defense in 2012, based in Quakertown, Pennsylvania, the Maximum Expansion meets lead-free regulations in areas like California with its solid copper construction.
Renowned for its maximum expansion and large wound channels, the Maximum Expansion delivers devastating terminal performance, making it a top choice for ethical hunters targeting medium game. Its innovative design ensures consistent results across varied hunting scenarios, from close-range brush to moderate distances.
- Caliber Range: Available from .224 to .452 inches, supporting cartridges like .223 Remington, .300 Blackout, .308 Winchester, 9mm Luger, .357 Magnum, and .45 Colt.
- Weight Options: Spans 70 to 220 grains, with key variants like 70-grain .224, 110-grain .308, and 194-grain .308 subsonic.
- Hunting Focus: Optimized for massive wound channels with controlled penetration, ideal for medium game and self-defense scenarios.
Technical Characteristics
The Lehigh Defense Maximum Expansion is crafted for hunters seeking massive energy transfer and reliability. Its solid copper construction and unique expansion make it a standout in the field.
- Solid Copper Construction: Lead-free design ensures compliance with regulations, with near-100% weight retention after expansion, preventing core-jacket separation.
- Expansion Design: Hollow-point cavity expands via hydraulic energy in fluid mediums, achieving up to 2x diameter with 4 razor-sharp petals for maximum wound channels.
- Barrier Blind: Does not expand on dry mediums like wood or bone, activating only on fluid for controlled performance and reduced over-penetration risks.
- Velocity and Range: Optimized for muzzle velocities of 750-3,000 fps, including subsonic, effective to 300+ yards with good stability.
- Reduced Fouling: Solid copper reduces barrel fouling by 15-20% compared to lead-core bullets, extending cleaning intervals.
Reloading requires precision, using standard dies and SAAMI-compliant COAL to manage pressures. Maintain case neck tension (0.002-0.004″) for optimal accuracy, as the Maximum Expansion’s durable construction suits rugged hunts but demands careful load development.
Ballistics and Performance
With G1 BCs ranging from 0.150 to 0.350, the Maximum Expansion offers solid stability and wind resistance for its class, supported by sectional density for effective penetration post-expansion. Field tests show a 110-grain .308 Maximum Expansion achieving 0.5-0.8 MOA at 300 yards with ES/SD under 15 fps from a 1:10 twist barrel. The 70-grain .224 is ideal for varmints, while the 194-grain .308 subsonic excels for close-range medium game, delivering energy to 200 yards.
The Expert Ballistics Table below lists key Maximum Expansion variants from Lehigh Defense specifications, sorted by diameter then weight. BCs are G1; verify on Lehigh’s site for updates.
| Diameter (inches) | Weight (grains) | Ballistic Coefficient (BC) | Sectional Density |
|---|---|---|---|
| 0.224 | 70 | 0.250 | 0.199 |
| 0.308 | 110 | 0.300 | 0.166 |
| 0.308 | 175 | 0.350 | 0.264 |
| 0.308 | 194 | 0.350 | 0.292 |
| 0.355 | 150 | 0.199 | 0.169 |
| 0.452 | 220 | 0.184 | 0.154 |
Groups of 0.5-0.8 MOA achievable; excels to 300 yards with proper shot placement.
Comparison Bullets
The Maximum Expansion competes with Lehigh Defense Controlled Fracturing (pre-stressed fragmentation) and Hornady GMX (monolithic copper). Its BCs (0.150-0.350) are comparable to Controlled Fracturing (0.150-0.450) but lower than GMX (0.245-0.540) in some weights, offering larger wound channels. The Maximum Expansion expands to 2x diameter at 750 fps, achieving 10-15% more wound volume than GMX but with limited penetration unlike Controlled Fracturing. Against Controlled Fracturing 198gr .308, the Maximum Expansion 194gr .308 creates wider channels at subsonic; versus GMX 139gr 6.5mm, it expands 10% larger. Advantages: lead-free, max wound, barrier blind. Drawbacks: velocity-sensitive, higher cost ($0.50-$1.00 per bullet).
| Bullet | Diameter Range (inches) | Weight Range (grains) | BC Range | Key Feature |
|---|---|---|---|---|
| Lehigh Defense Maximum Expansion | 0.224-0.452 | 70-220 | 0.150-0.350 | Hydraulic expansion, solid copper |
| Lehigh Defense Controlled Fracturing | 0.308-0.500 | 90-300 | 0.150-0.450 | Pre-stressed fragmentation, solid copper/brass |
| Hornady GMX | 0.224-0.338 | 70-200 | 0.245-0.540 | Polymer tip, monolithic copper |
Field reports show Maximum Expansion outperforming Controlled Fracturing in wound volume and matching GMX in penetration consistency for medium game hunting.
Applications and Practical Aspects
Ideal for hunting:
- 70gr .224 for varmints;
- 110-175gr .308 for deer and hogs;
- 194gr .308 subsonic for close-range medium game;
- 150-220gr .355-.452 for self-defense or medium game.
Delivers 0.5-0.8 MOA in tuned rifles, ideal for ethical kills.
Reloading
- Load Data: Refer to Lehigh’s load data library or website for Maximum Expansion-specific data, as the solid copper design generates higher pressures than lead-core bullets.
- Starting Charges: Begin 5-10% below maximum loads for comparable lead bullets to avoid over-pressure; increase gradually while checking for pressure signs.
- Seating Consistency: Ensure precise seating depths (0.010-0.050″ off lands) to maximize accuracy, as the Maximum Expansion’s bearing surface is sensitive to inconsistencies.
- Crimp Application: Apply a light to medium crimp on the cannelure for secure bullet retention, particularly in semi-auto or high-recoil rifles, ensuring reliable feeding.
- Barrel Twist Compatibility: Match barrel twist rate to Maximum Expansion weight (e.g., 1:10 for 110gr .308, 1:7 for 194gr .308) for proper stabilization and optimal accuracy.
- Velocity Check: Chronograph to confirm velocities above 750-1,000 fps for reliable expansion, targeting extreme spreads under 15 fps.
- Storage: Store in sealed containers to protect from moisture; suitable for all hunting applications per design.
Conclusion
Lehigh Defense Maximum Expansion is an innovative lead-free hunting bullet, blending maximum expansion for wound channels with controlled penetration. Its barrier-blind design and accuracy make it ideal for hunters in lead-restricted areas or pursuing medium game. Visit official website.
