Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 128gr | Hammer Stone Hammer bullet and 91 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and Alliant Reloder-17.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 55,405 psi | 87% | 3310 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,143 psi | 85% | 3323 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,331 psi | 85% | 3320 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,507 psi | 89% | 3389 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 54,302 psi | 85% | 3363 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,621 psi | 86% | 3415 fps | 98.1% |
| Accurate LT-30 | <<locked>> | 82% | 57,421 psi | 90% | 3307 fps | 100% |
| ADI AR 2206H | <<locked>> | 88% | 54,882 psi | 86% | 3396 fps | 99% |
| ADI AR 2208 | <<locked>> | 94% | 56,144 psi | 88% | 3386 fps | 98.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,450 psi | 90% | 3406 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 86% | 54,056 psi | 85% | 3343 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,201 psi | 87% | 3474 fps | 99.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,969 psi | 86% | 3507 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,941 psi | 88% | 3409 fps | 99.6% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,708 psi | 86% | 3330 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,652 psi | 89% | 3435 fps | 98.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,344 psi | 82% | 3419 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,722 psi | 84% | 3465 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,363 psi | 90% | 3281 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,187 psi | 86% | 3396 fps | 98.3% |
| Bofors RP3 | <<locked>> | 94% | 56,956 psi | 89% | 3428 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,709 psi | 87% | 3340 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 88% | 57,334 psi | 90% | 3432 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,143 psi | 86% | 3471 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 82% | 54,172 psi | 85% | 3363 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,796 psi | 87% | 3379 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,418 psi | 85% | 3373 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 88% | 55,390 psi | 87% | 3409 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,472 psi | 76% | 3281 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,129 psi | 86% | 3435 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,838 psi | 55% | 2211 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,942 psi | 89% | 3415 fps | 99.5% |
| IMR 3031 | <<locked>> | 88% | 54,911 psi | 86% | 3409 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,448 psi | 87% | 3369 fps | 98.7% |
| IMR 4198 | <<locked>> | 82% | 54,592 psi | 86% | 3297 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,576 psi | 81% | 3343 fps | 97.7% |
| IMR 4895 | <<locked>> | 90% | 54,476 psi | 85% | 3415 fps | 99% |
| IMR 8208 XBR | <<locked>> | 88% | 57,450 psi | 90% | 3406 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 82% | 54,172 psi | 85% | 3330 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 88% | 54,694 psi | 86% | 3369 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,491 psi | 85% | 3320 fps | 98.9% |
| Lovex S062 | <<locked>> | 92% | 55,201 psi | 87% | 3373 fps | 99.7% |
| Lovex S065 | <<locked>> | 98% | 54,897 psi | 86% | 3346 fps | 96.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3373 fps | 95.9% |
| Norma 201 | <<locked>> | 90% | 57,232 psi | 90% | 3402 fps | 99.8% |
| Norma 202 | <<locked>> | 90% | 57,653 psi | 90% | 3406 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,825 psi | 87% | 3422 fps | 99.1% |
| Norma URPᴾ | <<locked>> | 100% | 53,621 psi | 84% | 3402 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 92% | 56,840 psi | 89% | 3438 fps | 99.2% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,866 psi | 83% | 3383 fps | 96.1% |
| Ramshot TAC | <<locked>> | 86% | 54,766 psi | 86% | 3343 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,099 psi | 85% | 3373 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,245 psi | 87% | 3343 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,172 psi | 55% | 2260 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,768 psi | 89% | 3392 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,795 psi | 86% | 3343 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 57,174 psi | 90% | 3510 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 57,305 psi | 90% | 3543 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,607 psi | 86% | 3432 fps | 97.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,839 psi | 86% | 3458 fps | 97.6% |
| Rottweil R 901 | <<locked>> | 86% | 54,302 psi | 85% | 3337 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,682 psi | 90% | 3396 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 96% | 56,565 psi | 89% | 3412 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,897 psi | 86% | 3346 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,694 psi | 86% | 3369 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,201 psi | 87% | 3373 fps | 99.7% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3373 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,652 psi | 89% | 3353 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,056 psi | 86% | 3415 fps | 99% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,608 psi | 87% | 3353 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,739 psi | 89% | 3383 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 57,290 psi | 90% | 3415 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,100 psi | 86% | 3294 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,448 psi | 87% | 3278 fps | 100% |
| Somchem S321 | <<locked>> | 84% | 55,448 psi | 87% | 3379 fps | 99.8% |
| Somchem S335 | <<locked>> | 88% | 54,679 psi | 86% | 3284 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,318 psi | 88% | 3373 fps | 99.1% |
| Somchem S355 | <<locked>> | 96% | 56,985 psi | 89% | 3412 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 3340 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 84% | 54,592 psi | 86% | 3264 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,187 psi | 86% | 3278 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 57,000 psi | 89% | 3366 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,810 psi | 86% | 3323 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,013 psi | 86% | 3337 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,405 psi | 88% | 3402 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 86% | 54,375 psi | 85% | 3346 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 92% | 57,014 psi | 89% | 3366 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,622 psi | 87% | 3406 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,751 psi | 84% | 3317 fps | 99.5% |
| Winchester 748 | <<locked>> | 86% | 54,360 psi | 85% | 3396 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 90% | 57,363 psi | 90% | 3425 fps | 99.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 45,629 psi | 72% | 3153 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,386 psi | 79% | 3261 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 38,421 psi | 60% | 3038 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,643 psi | 72% | 3205 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 36,245 psi | 57% | 3009 fps | 98.6% |
| Accurate 4350 | <<locked>> | 94% | 43,918 psi | 69% | 3212 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 53,867 psi | 84% | 3255 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 42,148 psi | 66% | 3143 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 84% | 40,872 psi | 64% | 3087 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,208 psi | 69% | 3163 fps | 98.1% |
| Alliant AR-Comp | <<locked>> | 80% | 43,816 psi | 69% | 3179 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,459 psi | 81% | 3409 fps | 98.8% |
| Alliant Power Pro 2000-MR | 82.5 gr | 84% | 44,353 psi | 70% | 3284 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,201 psi | 55% | 2979 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,445 psi | 81% | 3278 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 40,698 psi | 64% | 3120 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 94% | 43,105 psi | 68% | 3222 fps | 95.4% |
| Alliant Reloder-17 | 83.2 gr | 86% | 37,826 psi | 59% | 3117 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,809 psi | 84% | 3228 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,713 psi | 65% | 3130 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 34,809 psi | 55% | 2976 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,035 psi | 72% | 3166 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,294 psi | 68% | 3176 fps | 98.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,529 psi | 74% | 3330 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 80% | 50,662 psi | 79% | 3304 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,924 psi | 81% | 3320 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 44,193 psi | 69% | 3176 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 42,525 psi | 67% | 3156 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 37,028 psi | 58% | 3028 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,609 psi | 61% | 3104 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,701 psi | 40% | 1988 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,872 psi | 64% | 3104 fps | 96.5% |
| IMR 3031 | <<locked>> | 80% | 41,829 psi | 66% | 3176 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 40,147 psi | 63% | 3068 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 51,300 psi | 80% | 3245 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 41,945 psi | 66% | 3150 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 38,856 psi | 61% | 3091 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 44,208 psi | 69% | 3163 fps | 98.1% |
| Lovex D073.5 | <<locked>> | 80% | 50,386 psi | 79% | 3264 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 41,205 psi | 65% | 3120 fps | 98.8% |
| Lovex S060 | <<locked>> | 80% | 42,337 psi | 66% | 3084 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 37,376 psi | 59% | 3012 fps | 96.3% |
| Lovex S065 | <<locked>> | 94% | 48,341 psi | 76% | 3225 fps | 95.2% |
| Lovex S070 | <<locked>> | 98% | 52,460 psi | 82% | 3314 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 41,263 psi | 65% | 3097 fps | 97.5% |
| Norma 202 | <<locked>> | 80% | 41,481 psi | 65% | 3117 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 40,030 psi | 63% | 3107 fps | 95.7% |
| Norma URP | <<locked>> | 94% | 43,642 psi | 68% | 3209 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 82% | 39,798 psi | 62% | 3107 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 98% | 49,356 psi | 77% | 3317 fps | 95.1% |
| Ramshot TAC | <<locked>> | 82% | 47,732 psi | 75% | 3215 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,859 psi | 69% | 3173 fps | 96.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,138 psi | 75% | 3215 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,947 psi | 41% | 2034 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,777 psi | 78% | 3274 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 51,256 psi | 80% | 3281 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 42,728 psi | 67% | 3232 fps | 95.8% |
| ReloadSwiss RS 60 | 77.4 gr | 80% | 32,706 psi | 51% | 2986 fps | 95.7% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 43,787 psi | 69% | 3225 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 47,558 psi | 75% | 3314 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 45,136 psi | 71% | 3173 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 39,247 psi | 62% | 3041 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 84% | 37,594 psi | 59% | 3038 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 48,341 psi | 76% | 3225 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,205 psi | 65% | 3120 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 37,376 psi | 59% | 3012 fps | 96.3% |
| Shooters World SW4350 | <<locked>> | 98% | 52,460 psi | 82% | 3314 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,881 psi | 83% | 3291 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 38,986 psi | 61% | 3094 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,011 psi | 82% | 3297 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 45,861 psi | 72% | 3179 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,973 psi | 64% | 3104 fps | 96% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,598 psi | 67% | 3068 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,259 psi | 55% | 2900 fps | 98.9% |
| Somchem S321 | <<locked>> | 80% | 48,283 psi | 76% | 3255 fps | 99.1% |
| Somchem S335 | <<locked>> | 80% | 42,322 psi | 66% | 3064 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 42,482 psi | 67% | 3117 fps | 96.4% |
| Somchem S355 | <<locked>> | 84% | 38,392 psi | 60% | 3048 fps | 95.8% |
| Somchem S365 | <<locked>> | 90% | 34,011 psi | 53% | 3012 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 48,153 psi | 75% | 3163 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,801 psi | 67% | 3071 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,276 psi | 60% | 3038 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,262 psi | 62% | 3038 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 82% | 34,316 psi | 54% | 2917 fps | 95.9% |
| Vihtavuori N160 | <<locked>> | 92% | 42,801 psi | 67% | 3150 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 44,295 psi | 69% | 3159 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 80% | 38,000 psi | 60% | 3015 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 94% | 45,237 psi | 71% | 3212 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 37,927 psi | 59% | 2995 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 43,918 psi | 69% | 3202 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,408 psi | 63% | 3100 fps | 96.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 91 powders for .338 Rem. Ultra Mag. loaded with the .338 | 128gr | Hammer Stone Hammer. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,543 fps; across all powders the maximum-charge window runs from 2,211 fps to 3,543 fps. Accurate 4350 gives the best case fill at 100 %, and 91 of the 91 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. Accurate 4350, Alliant Reloder-16, Hodgdon Hybrid 100V reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 128gr | Hammer Stone Hammer they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.