Load Specifications
Load data in caliber .300 PRC with .308 | 125gr | Nosler AccuBond bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 and Hodgdon Superformance.
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.
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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>> | 82% | 58,175 psi | 89% | 3304 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 58,363 psi | 90% | 3333 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,434 psi | 87% | 3323 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,038 psi | 77% | 3278 fps | 97.4% |
| Accurate 4064 | <<locked>> | 88% | 58,523 psi | 90% | 3389 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,724 psi | 86% | 3425 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 84% | 57,769 psi | 89% | 3419 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 88% | 55,390 psi | 85% | 3356 fps | 99.6% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,174 psi | 88% | 3458 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,478 psi | 87% | 3363 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,957 psi | 89% | 3337 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 58,682 psi | 90% | 3560 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,956 psi | 86% | 3386 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,449 psi | 87% | 3412 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,405 psi | 87% | 3491 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 58,059 psi | 89% | 3527 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,318 psi | 87% | 3438 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,891 psi | 72% | 3304 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,012 psi | 83% | 3514 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 58,102 psi | 89% | 3432 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 56,956 psi | 88% | 3402 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 56,565 psi | 87% | 3373 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,725 psi | 89% | 3346 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,507 psi | 87% | 3389 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,740 psi | 89% | 3419 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 58,334 psi | 90% | 3481 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 92% | 58,131 psi | 89% | 3438 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 58,392 psi | 90% | 3432 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,652 psi | 87% | 3406 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,027 psi | 85% | 3406 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,926 psi | 85% | 3445 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 55% | 2172 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,970 psi | 86% | 3376 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,813 psi | 90% | 3415 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,291 psi | 90% | 3402 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,885 psi | 89% | 3376 fps | 97.9% |
| IMR 4350 | <<locked>> | 96% | 57,377 psi | 88% | 3399 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 58,233 psi | 90% | 3406 fps | 97.9% |
| IMR 4831 | <<locked>> | 96% | 56,144 psi | 86% | 3412 fps | 99.5% |
| IMR 4895 | <<locked>> | 86% | 57,943 psi | 89% | 3448 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,478 psi | 87% | 3363 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 58,233 psi | 90% | 3392 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,565 psi | 87% | 3337 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 58,508 psi | 90% | 3399 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 58,334 psi | 90% | 3402 fps | 99% |
| Lovex S070 | <<locked>> | 94% | 55,883 psi | 86% | 3376 fps | 97.8% |
| Norma 201 | <<locked>> | 84% | 56,376 psi | 87% | 3356 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,087 psi | 88% | 3360 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,738 psi | 86% | 3396 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 58,581 psi | 90% | 3458 fps | 96.3% |
| Norma MRPᴾ | <<locked>> | 100% | 53,026 psi | 82% | 3458 fps | 97.1% |
| Norma URP | <<locked>> | 96% | 58,233 psi | 90% | 3471 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 56,753 psi | 87% | 3422 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 57,116 psi | 88% | 3461 fps | 98.6% |
| Ramshot TAC | <<locked>> | 82% | 56,840 psi | 87% | 3379 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,869 psi | 87% | 3399 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,463 psi | 56% | 2224 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,696 psi | 89% | 3396 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,305 psi | 88% | 3488 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 57,580 psi | 89% | 3527 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,825 psi | 86% | 3445 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 58,668 psi | 90% | 3543 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 57,101 psi | 88% | 3340 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,159 psi | 88% | 3360 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,043 psi | 88% | 3399 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,303 psi | 85% | 3422 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 92% | 56,565 psi | 87% | 3373 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 58,334 psi | 90% | 3402 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 58,233 psi | 90% | 3392 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 58,508 psi | 90% | 3399 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,883 psi | 86% | 3376 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,056 psi | 85% | 3399 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,608 psi | 86% | 3353 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,318 psi | 87% | 3383 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,319 psi | 88% | 3291 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 58,334 psi | 90% | 3287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 58,363 psi | 90% | 3346 fps | 98% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,810 psi | 84% | 3412 fps | 95.9% |
| Somchem S335 | <<locked>> | 84% | 56,971 psi | 88% | 3284 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,187 psi | 85% | 3340 fps | 99.8% |
| Somchem S355 | <<locked>> | 90% | 56,884 psi | 88% | 3392 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 57,319 psi | 88% | 3474 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,144 psi | 86% | 3396 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 57,696 psi | 89% | 3271 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,246 psi | 88% | 3320 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,696 psi | 89% | 3333 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 58,523 psi | 90% | 3366 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,695 psi | 87% | 3402 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 56,884 psi | 88% | 3360 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,101 psi | 86% | 3323 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,956 psi | 86% | 3406 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,460 psi | 81% | 3399 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,000 psi | 88% | 3369 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,624 psi | 89% | 3415 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 58,537 psi | 90% | 3484 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,366 psi | 65% | 3327 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,521 psi | 87% | 3392 fps | 100% |
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% | 54,795 psi | 84% | 3255 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,906 psi | 74% | 3163 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 49,472 psi | 76% | 3196 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 43,439 psi | 67% | 3140 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 45,324 psi | 70% | 3159 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 36,579 psi | 56% | 3009 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 50,807 psi | 78% | 3294 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 43,178 psi | 66% | 3114 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 98% | 53,534 psi | 82% | 3389 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,881 psi | 81% | 3301 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,215 psi | 83% | 3281 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,253 psi | 73% | 3337 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,381 psi | 67% | 3140 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,369 psi | 71% | 3215 fps | 98.6% |
| Alliant Reloder-16 | 69.8 gr | 82% | 35,853 psi | 55% | 3018 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,913 psi | 58% | 3100 fps | 97.6% |
| Alliant Reloder-19 | <<locked>> | 98% | 52,620 psi | 81% | 3369 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 33,736 psi | 52% | 2969 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 39,987 psi | 62% | 3199 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,604 psi | 78% | 3297 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 43,540 psi | 67% | 3146 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 49,835 psi | 77% | 3241 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,099 psi | 83% | 3284 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,837 psi | 81% | 3327 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,990 psi | 68% | 3146 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 47,572 psi | 73% | 3274 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 50,908 psi | 78% | 3301 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 51,329 psi | 79% | 3307 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 33,170 psi | 51% | 2900 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,892 psi | 74% | 3271 fps | 99.7% |
| Hodgdon Superformance | 85.3 gr | 88% | 47,456 psi | 73% | 3294 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 41% | 1952 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,168 psi | 76% | 3248 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 51,721 psi | 80% | 3301 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,382 psi | 70% | 3156 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,747 psi | 73% | 3182 fps | 95.7% |
| IMR 4350 | <<locked>> | 90% | 47,442 psi | 73% | 3209 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 86% | 48,428 psi | 75% | 3219 fps | 95.8% |
| IMR 4831 | <<locked>> | 84% | 37,608 psi | 58% | 3018 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 47,529 psi | 73% | 3251 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 52,881 psi | 81% | 3301 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,792 psi | 78% | 3268 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,009 psi | 77% | 3215 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 45,469 psi | 70% | 3156 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 42,569 psi | 65% | 3087 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 46,282 psi | 71% | 3189 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 49,705 psi | 76% | 3238 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 50,270 psi | 77% | 3241 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,716 psi | 70% | 3202 fps | 98.9% |
| Norma 204 | <<locked>> | 94% | 54,665 psi | 84% | 3386 fps | 95.5% |
| Norma MRP | <<locked>> | 96% | 45,876 psi | 71% | 3304 fps | 95% |
| Norma URP | <<locked>> | 84% | 39,001 psi | 60% | 3071 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 46,021 psi | 71% | 3219 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 43,555 psi | 67% | 3189 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 53,171 psi | 82% | 3310 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,055 psi | 82% | 3330 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 42% | 1995 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,193 psi | 68% | 3127 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,821 psi | 77% | 3346 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,321 psi | 62% | 3182 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 39,030 psi | 60% | 3091 fps | 95.6% |
| ReloadSwiss RS 70 | 80.1 gr | 86% | 41,176 psi | 63% | 3173 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 53,664 psi | 83% | 3284 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,268 psi | 73% | 3182 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 40,785 psi | 63% | 3077 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 98% | 51,750 psi | 80% | 3353 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 88% | 49,835 psi | 77% | 3241 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 42,569 psi | 65% | 3087 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,792 psi | 78% | 3268 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,469 psi | 70% | 3156 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 46,282 psi | 71% | 3189 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,018 psi | 65% | 3136 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,808 psi | 80% | 3284 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,371 psi | 76% | 3251 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,546 psi | 78% | 3179 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,554 psi | 65% | 3015 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,817 psi | 69% | 3087 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 51,271 psi | 79% | 3346 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,430 psi | 78% | 3176 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,459 psi | 79% | 3274 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 41,379 psi | 64% | 3084 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 30,545 psi | 47% | 2877 fps | 96.2% |
| Somchem S385 | <<locked>> | 96% | 49,153 psi | 76% | 3264 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 50,995 psi | 78% | 3166 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,166 psi | 73% | 3156 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,558 psi | 73% | 3159 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,407 psi | 61% | 3005 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 37,985 psi | 58% | 3012 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 53,301 psi | 82% | 3301 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,050 psi | 71% | 3146 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 37,463 psi | 58% | 3009 fps | 95% |
| Vihtavuori N555 | <<locked>> | 88% | 34,896 psi | 54% | 2999 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,969 psi | 54% | 2910 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 53,853 psi | 83% | 3353 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 47,747 psi | 73% | 3278 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 32,198 psi | 50% | 3005 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,255 psi | 76% | 3258 fps | 99.6% |
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 97 powders for .300 PRC loaded with the .308 | 125gr | Nosler AccuBond. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,560 fps; across all powders the maximum-charge window runs from 2,172 fps to 3,560 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 125.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 Reloder-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .300 PRC with the .308 | 125gr | Nosler AccuBond 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.