Disclaimer: Reloading is an inherently dangerous activity. Always consult current published load data from reputable sources (Sierra, Hodgdon, Hornady, Lyman) before loading any cartridge. Start at minimum charges and work up carefully while watching for pressure signs. Never exceed maximum published loads. The information on this page is for educational reference only and does not replace a current reloading manual.
Published: 2024 | Last updated: June 2026
Introduction
The Sierra GameKing has been a staple of North American hunting for nearly five decades. Sierra Bullets introduced it in 1978 from their facility in Sedalia, Missouri, and the design has changed very little since – which is either a testament to getting it right the first time, or a sign that hunters keep voting for it with their wallets season after season.
The GameKing occupies a specific niche that many hunters find genuinely useful: it is a soft-point hunting bullet with a boat-tail base, which gives it better long-range ballistics than flat-base hunting designs while keeping terminal expansion predictable. If you are loading for 243 Winchester, 270 Winchester, 308 Winchester, 30-06 Springfield, or any of a dozen other common hunting cartridges, a GameKing variant almost certainly exists for your combination of bore and bullet weight.
The caliber range runs from .224-inch to .375-inch diameter, covering everything from 223 Remington varmint loads up through serious big game cartridges like the 338 Winchester Magnum. Weights span 55 to 250 grains. That breadth is deliberate – Sierra built the GameKing to be a single-line answer to the question “what do I load for deer season?” regardless of what rifle you happen to own.
What sets the GameKing apart from Sierra’s own Pro-Hunter is the boat-tail base. At ranges under 200 yards the difference is small. At 350 yards into a stiff crosswind, a boat-tail will arrive with noticeably more velocity, less deflection, and a tighter group on paper – or on a deer’s shoulder. That is the practical case for the GameKing over its flat-base sibling.
Technical Characteristics
The GameKing’s construction is conventional in the best sense of the word. Sierra uses a lead core encased in a copper-alloy jacket, with the jacket thinned at the nose to expose a lead soft-point tip. That exposed lead is what initiates expansion: on impact, the soft nose deforms into the core and the jacket peels back in a controlled mushroom. Sierra designs for 1.5x to 2x diameter expansion, which at .308-inch means a mushroom roughly .45 to .60 inches across – adequate for reliable energy transfer on deer-sized game and large enough to create a usable wound channel.
The jacket thickness is graduated – thinner at the tip for consistent initiation, thicker through the shank to control expansion rate and prevent the bullet from shedding its core prematurely. This matters most at high-velocity impact scenarios: a 150-grain GameKing from a 300 Winchester Magnum hitting a whitetail broadside at 150 yards will expand more aggressively than the same bullet at 400 yards from a 308 Winchester. Sierra’s jacket construction is designed to handle both scenarios without blowing apart at close range or failing to expand at long range.
The minimum expansion velocity threshold is approximately 1,800 fps. This is a meaningful number: it defines your effective hunting range in practice. When velocity drops below that point, the soft-point tip may not deform reliably and you risk a pencil-hole wound track rather than an expanded mushroom. For most hunting cartridges and standard bullet weights, 1,800 fps corresponds to somewhere between 400 and 600 yards depending on the specific loading – well past what most hunters should be shooting at game anyway.
The boat-tail base is a half-degree taper that reduces base drag as the bullet travels downrange. It also makes the GameKing slightly more forgiving of seating depth variations during reloading compared to flat-base bullets, since the boat-tail eases cartridge feeding and helps maintain consistent neck tension. The cannelure – the groove crimped around the bullet shank – gives reloaders the option to apply a crimp, which matters for tubular-magazine lever guns, semi-automatic platforms, or any rifle with significant recoil where bullet setback under feeding pressure is a concern.
Ballistic coefficients (G1) range from 0.185 for the lightest .224-inch variants up to 0.517 for the 215-grain .338-inch version. Higher BC means the bullet retains velocity and resists wind better at distance. For context, a BC of 0.400 or above is generally considered strong for a hunting bullet and keeps the GameKing competitive with more expensive bonded or monolithic designs at normal hunting ranges.
Neck tension during reloading should be maintained between 0.002 and 0.004 inches of interference fit. Below that range, bullets can seat inconsistently or shift under recoil in a magazine. Above it, you risk case neck work-hardening quickly and shortening brass life. Standard full-length or neck-sizing dies set up properly for your chamber will land in that range without special adjustment.
Ballistics and Performance
The GameKing earns its reputation on paper and in the field, but the numbers require context to be useful.
G1 BCs between 0.185 and 0.517 cover a wide range of aerodynamic performance. The lighter .224-inch bullets at the low end of that scale are still serviceable varmint rounds – a 55-grain GameKing at 0.250 BC from a 22-250 Remington is a capable coyote and prairie dog bullet out to 300 yards. The 140-grain 6.5mm GameKing at 0.465 BC is a different animal entirely: it competes directly with purpose-built long-range hunting bullets and holds its velocity well past 500 yards from a 6.5 Creedmoor or 6.5×55 Swedish Mauser.
Sectional density values tell a parallel story. A bullet’s SD is its mass relative to its cross-sectional area, and it predicts penetration depth independent of velocity. The 180-grain .308-inch GameKing at SD 0.271 will penetrate substantially deeper than the 150-grain at SD 0.226 – a meaningful difference when you are considering elk versus deer, or shoulder shots versus broadside lung shots. For most deer hunting, SD above 0.200 is adequate. For elk or bear, staying at 0.250 or above is a reasonable guideline.
Accuracy potential is strong. Sierra is known for tight quality control on their manufacturing, and field reports consistently place the GameKing at 0.5 to 1.0 MOA in well-tuned bolt-action rifles. That is not benchrest performance, but it is more than adequate for ethical hunting shots out to the practical range limits of the cartridge. The 100-grain .243-inch GameKing is a particular standout, frequently producing sub-MOA groups in 243 Winchester rifles with 1:10 twist barrels and moderate charges of Hodgdon Varget or IMR 4064.
Expert Ballistics Table – Sierra GameKing Variants
Data from Sierra Bullets specifications. BCs are G1 values. Verify current figures on Sierra’s website before load development.
| Diameter (inches) | Weight (grains) | BC (G1) | Sectional Density | Application |
|---|---|---|---|---|
| .224 | 55 | 0.250 | 0.157 | Varmints, coyotes to 300 yards |
| .224 | 65 | 0.303 | 0.185 | Varmints, small deer at close range |
| .243 | 85 | 0.315 | 0.206 | Deer, antelope, light medium game |
| .243 | 100 | 0.361 | 0.242 | Deer, antelope to 400 yards |
| .264 | 120 | 0.400 | 0.246 | Deer, antelope, long-range hunting |
| .264 | 140 | 0.465 | 0.287 | Elk, deer, bear – versatile 6.5mm choice |
| .277 | 130 | 0.373 | 0.242 | Deer, antelope in 270 Winchester |
| .284 | 140 | 0.390 | 0.248 | Deer, black bear in 7mm cartridges |
| .308 | 150 | 0.343 | 0.226 | Deer, antelope – standard hunting weight |
| .308 | 165 | 0.363 | 0.248 | Deer, elk – the most versatile 30-cal option |
| .308 | 180 | 0.435 | 0.271 | Elk, moose, large deer – deep penetration |
| .338 | 215 | 0.517 | 0.269 | Long-range big game, elk, bear |
The 165-grain .308-inch variant deserves special mention. It is arguably the most popular GameKing weight for 308 Winchester and 30-06 Springfield hunters because it splits the difference between the lighter 150-grain (faster, flatter, but marginally less penetration) and the heavier 180-grain (deeper penetration, more drop). The 165-grain at SD 0.248 handles whitetail and mule deer reliably and has enough margin for elk with a proper shot placement. Many hunters load nothing else for mixed-species seasons.
The 180-grain .308-inch version – BC 0.435, SD 0.271 – is a better choice if elk or moose is the primary target. The additional mass slows velocity but improves penetration through heavy bone and muscle, and the higher BC partially compensates for the velocity difference at ranges beyond 300 yards. Paired with a 30-06 Springfield and IMR 4350 or Hodgdon H4350, it is a proven elk load with decades of field confirmation.
Comparison Bullets
The GameKing sits in a crowded market alongside several comparable soft-point hunting bullets. Understanding where it fits versus the competition helps you decide whether it is the right choice for your specific needs.
The Sierra Pro-Hunter is the GameKing’s flat-base sibling from the same factory. It uses the same jacket construction and lead core, but the flat base means BCs top out around 0.310 compared to the GameKing’s 0.517 at the high end. For shots under 200 yards – the majority of whitetail hunting in the eastern United States – the trajectory difference between the two is small enough to ignore. The Pro-Hunter is slightly less expensive and is the better choice if your hunting is consistently close-range. The GameKing is the better choice if you want a single bullet that works from 50 yards to 450 yards.
The Remington Core-Lokt is a different design philosophy. Core-Lokt uses a notched partition in the jacket to lock the core to the cup, which prevents core separation on impact. The result is a bullet that tends to retain more weight than the GameKing at high-velocity close-range impact, but the Core-Lokt’s BCs (0.200-0.300) are lower than comparable GameKing weights due to its construction geometry. For hunting inside 300 yards, the Core-Lokt is a proven performer and often less expensive. Beyond 300 yards, the GameKing’s aerodynamic advantage becomes meaningful.
The Federal Power-Shok occupies the budget end of the soft-point market. BCs (0.190-0.290) and weight retention are lower than the GameKing, and lot-to-lot consistency is somewhat more variable. At hunting ranges under 250 yards in factory ammunition, it is a perfectly adequate deer bullet. As a component for reloaders, it is rarely the first choice when GameKing pricing is only marginally higher.
Comparison Table – Soft-Point Hunting Bullets
| Bullet | Diameter Range | Weight Range | BC Range | Core Construction | Relative Cost |
|---|---|---|---|---|---|
| Sierra GameKing | .224-.375 | 55-250 gr | 0.185-0.517 | Lead/copper jacket, boat-tail | Mid |
| Sierra Pro-Hunter | .224-.458 | 55-400 gr | 0.185-0.310 | Lead/copper jacket, flat-base | Mid-low |
| Remington Core-Lokt | .224-.375 | 55-250 gr | 0.200-0.300 | Locked-core soft-point | Mid-low |
| Federal Power-Shok | .224-.458 | 55-300 gr | 0.190-0.290 | Lead/copper jacket | Budget |
If you are comparing the GameKing against bonded bullets like the Nosler AccuBond or premium monolithics like the Barnes TSX, the tradeoff is different. Bonded and monolithic bullets retain more weight on impact and are less likely to shed their core at high velocity or on heavy bone. The GameKing will expand more aggressively on softer tissue, which translates to a larger wound channel – but it may lose more weight on a shoulder shot than a bonded design would. For deer at moderate ranges, that rarely matters. For elk at close range on a quartering-to shot, a bonded bullet like the Nosler Partition or a monolithic like the Barnes TTSX gives a meaningful margin of reliability.
The honest assessment: the GameKing is an excellent hunting bullet for the majority of North American hunting scenarios, particularly deer, antelope, and black bear at ranges from 50 to 450 yards. It is not the best choice for dangerous game, very close range at magnum velocities, or hunting in jurisdictions with lead-free requirements.
Applications and Practical Aspects
The GameKing’s caliber and weight range makes it one of the most broadly applicable hunting bullets available to handloaders. Here is how to think about matching the right variant to your hunt.
Varmints and small game (.224-inch, 55-65 grains): The lighter GameKings in .224-inch are capable varmint bullets at moderate ranges. The 55-grain at BC 0.250 is a good coyote round out of a 223 Remington or 22-250 Remington to about 300 yards. The 65-grain at BC 0.303 stretches that range somewhat and is occasionally used for deer where it is legal – though for deer, the .243-inch options are a better starting point given the added mass and penetration.
Deer and antelope (.243-inch, 85-100 grains): This is where the GameKing shines. The 100-grain .243-inch variant in 243 Winchester is one of the most field-proven deer bullets in North America. It is flat-shooting, accurate, and expands reliably on deer at velocities the 243 Win produces at realistic ranges. The 85-grain is a better choice for lighter antelope or at ranges where impact velocity will be higher, since the lighter bullet expands more readily at threshold velocities. Powders like Hodgdon Varget, IMR 4064, and Hodgdon H4350 pair well with these weights.
Mid-range elk, deer, black bear (6.5mm, 120-140 grains): The 6.5mm GameKings are excellent for anyone shooting 6.5 Creedmoor, 6.5 PRC, 6.5×55 Swedish Mauser, or 260 Remington. The 140-grain at BC 0.465 and SD 0.287 is particularly strong – SD that high gives meaningful penetration through heavy muscle and bone, and the BC keeps the bullet supersonic well past 500 yards. For hunting in the Sierra Nevada or other open terrain where shots might extend to 400 yards, the 140-grain 6.5mm GameKing with Hodgdon H4350 or Alliant Reloder 16 is a well-validated combination.
Large deer, elk (.308-inch, 150-180 grains): The three .308-inch weights cover the full range of practical hunting with 308 Winchester, 30-06 Springfield, 300 Winchester Magnum, and similar cartridges. The 150-grain is the deer hunter’s standard – flat trajectory, manageable recoil, adequate penetration. The 165-grain handles deer and elk. The 180-grain is the choice when elk or moose is the primary target, where penetration matters more than the marginal velocity advantage of lighter bullets.
Long-range big game (.338-inch, 215 grains): The 215-grain .338-inch GameKing has one of the highest BCs in the entire lineup at 0.517, which makes it a genuine long-range hunting option in cartridges like 338 Winchester Magnum or 338 Lapua Magnum. At extended ranges, SD 0.269 ensures the bullet arrives with enough energy and sectional mass to penetrate reliably even after significant velocity loss.
Across all applications, the GameKing delivers consistent 0.5 to 1.0 MOA accuracy in properly set-up rifles. At typical hunting ranges, that means you are capable of sub-2-inch groups at 200 yards from a rested position – tighter than most hunters can hold offhand in the field, which keeps the bullet from being the limiting factor.
Reloading
The GameKing is a well-behaved component for handloaders. It does not require special techniques, exotic equipment, or unusual case preparation – standard practice produces good results.
Primers: Sierra recommends standard large rifle or small rifle primers as appropriate for the cartridge. For most hunting applications, standard primers are adequate. Magnum primers may be appropriate for slow-burning powders in large cases or in cold weather conditions where ignition consistency matters more. CCI 200 and Federal 210 are reliable choices for most .30-caliber and larger applications. CCI 400 or Federal 205 work well for smaller cartridges in the .224 and .243 range. For AR-platform rifles in .223, the CCI No. 41 is the correct choice to prevent slam-fire with its harder cup.
Cases: GameKing bullets are available in standard SAAMI dimensions and work with brass from all major manufacturers. Lapua, Federal, and Winchester brass are commonly paired with GameKings for hunting loads. Case preparation requirements are standard: full-length resize (or neck-size only for bolt rifles you are not sharing brass between), trim to length, deburr, and prime. Military surplus brass with crimped primer pockets requires swaging or reaming before use.
Seating Depth: Sierra recommends seating GameKings 0.010 to 0.050 inches off the lands as a starting point. Many rifles perform best with a moderate jump of 0.020 to 0.030 inches, which gives enough clearance to avoid pressure spikes from a bullet jammed into the rifling but maintains good alignment. Measure your chamber’s actual lands-to-ogive distance with a comparator gauge if accuracy is a priority. For magazine-fed hunting rifles, overall cartridge length (COAL) will be constrained by magazine box dimensions regardless of the ideal seating depth.
Crimp: The GameKing’s cannelure makes crimping optional but available. For bolt-action rifles firing standard hunting loads, no crimp is needed – the cannelure just marks where to seat the bullet. For tubular-magazine rifles, lever-action platforms, or heavy-recoiling magnum cartridges where bullet setback under repeated chambering is a concern, apply a light roll crimp at the cannelure groove.
Barrel Twist: Match the twist rate to the bullet weight you are loading. Sierra publishes minimum twist recommendations for each GameKing weight. As a general guide: 1:12 is adequate for 55-grain .224-inch, 1:10 works well for 65-grain .224-inch and most .243-inch weights, 1:8 or 1:9 handles the heavier 6.5mm and .308-inch weights in longer bullets. If your barrel has a faster-than-recommended twist for a given bullet, accuracy typically does not suffer – you can overstabilize a bullet slightly without problems. Under-stabilizing (too-slow twist for a long, heavy bullet) causes keyholing and is immediately obvious in a target.
Powder Selection: The GameKing’s conventional construction means it works with any powder appropriate for the cartridge and bullet weight. For .243-inch weights, Hodgdon Varget, IMR 4064, and Hodgdon H4350 are the most commonly used. For .308-inch hunting weights, Hodgdon Varget, IMR 4064, Hodgdon H4895, and Alliant Reloder 15 cover the 150-165 grain range well. For 180-grain and heavier loads in 30-caliber magnums, slower powders like Hodgdon H4350, Hodgdon H4831SC, IMR 4350, and Alliant Reloder 19 are standard choices. The 6.5mm 140-grain GameKing responds particularly well to Hodgdon H4350 and Alliant Reloder 16.
Velocity and Expansion Confirmation: The GameKing needs at least 1,800 fps at impact for reliable expansion. Chronograph your loads and calculate the downrange velocity at your intended maximum hunting range using Sierra’s ballistic data or a ballistics calculator. If your load drops below 1,800 fps before the maximum range you plan to shoot, either limit your shots or switch to a heavier, higher-BC bullet that retains velocity better.
Load data note: All charge weights must be sourced from current Sierra, Hodgdon, Hornady, or Lyman manuals. Never use data from an unverified online source. Start at the published minimum charge and work up in 0.5-grain increments while monitoring for pressure signs: flattened primers, sticky extraction, cratered primer pockets, and increased muzzle blast are all signals to stop and reduce the charge.
Reloading Tips Summary
| Parameter | Guideline |
|---|---|
| Neck tension | 0.002-0.004 inch interference |
| Seating depth | 0.010-0.050 inch off lands |
| Crimp | Optional; required for tubular magazines and semi-auto |
| Minimum expansion velocity | 1,800 fps at target distance |
| Extreme spread target | Under 15 fps for hunting accuracy |
| Storage | Cool, dry, sealed container |
Conclusion
The Sierra GameKing is a well-designed, broadly applicable hunting bullet that earns its place in a serious handloader’s component cabinet. It is not the most advanced design on the market – it does not feature bonded construction, a polymer tip, or monolithic copper construction. What it does offer is reliable controlled expansion from 1,800 fps to well over 3,000 fps, strong ballistic coefficients for a soft-point design, consistent manufacturing quality, and availability in virtually every common hunting caliber.
The GameKing is best suited to hunters who want a single bullet design that works across deer, antelope, and black bear at ranges from 50 to 450 yards. It is the right choice when you need a proven, conventional hunting bullet with better-than-average aerodynamics and you do not need the extreme weight retention of a premium bonded design.
Choose the GameKing if: you hunt deer, antelope, or black bear at ranges up to 400 yards with cartridges like 243 Winchester, 270 Winchester, 308 Winchester, 30-06 Springfield, or 6.5 Creedmoor, and you want a boat-tail hunting bullet with established field performance and mid-range pricing.
Choose something else if: your hunting involves dangerous game, very close-range magnum shots where core separation is a risk, lead-free zones, or you specifically need the deep-penetration reliability of a bonded bullet like the Nosler AccuBond or the weight retention of a monolithic like the Barnes TSX.
For a large portion of North American big game hunting, the GameKing remains one of the best cost-per-performance choices available to handloaders.
Disclaimer: Reloading involves inherent risks. Always use current load data from published manuals. Never mix data from different sources for the same load. Start below maximum charges and increase gradually. Wear eye protection at all times. The author and myreloading.com are not responsible for injuries or property damage resulting from reloading or shooting handloaded ammunition.
Editorial note: Originally published 2024, revised June 2026. The update expanded all sections with practical field context and shooting application guidance, added a full reloading parameters table, expanded the comparison section with bonded and monolithic alternatives, added game-specific application guidance by bullet weight, and applied current internal linking throughout.
