Load Specifications
Load data in caliber .300 PRC with .308 | 132gr | Brenneke TIG nature bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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 2495 | <<locked>> | 84% | 55,376 psi | 85% | 3219 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,812 psi | 89% | 3291 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,372 psi | 79% | 3241 fps | 98.2% |
| Accurate 4064 | <<locked>> | 86% | 55,796 psi | 86% | 3278 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,261 psi | 88% | 3386 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 55,405 psi | 85% | 3314 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,811 psi | 87% | 3320 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 98% | 55,085 psi | 85% | 3360 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,682 psi | 89% | 3317 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,086 psi | 86% | 3445 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,421 psi | 88% | 3343 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,696 psi | 89% | 3366 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 58,189 psi | 90% | 3455 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,970 psi | 86% | 3422 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 58,015 psi | 89% | 3409 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,341 psi | 74% | 3271 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,090 psi | 65% | 3150 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,202 psi | 86% | 3488 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,477 psi | 85% | 3323 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 58,378 psi | 90% | 3360 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 57,899 psi | 89% | 3333 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,885 psi | 89% | 3346 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 55,085 psi | 85% | 3310 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 92% | 56,101 psi | 86% | 3376 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 90% | 55,898 psi | 86% | 3337 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 56,014 psi | 86% | 3323 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 58,436 psi | 90% | 3363 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,434 psi | 87% | 3360 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,913 psi | 88% | 3419 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 55% | 2126 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,276 psi | 88% | 3330 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,391 psi | 87% | 3307 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,173 psi | 86% | 3301 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,347 psi | 85% | 3271 fps | 98% |
| IMR 4350 | <<locked>> | 94% | 55,390 psi | 85% | 3304 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,941 psi | 86% | 3304 fps | 98% |
| IMR 4831 | <<locked>> | 96% | 57,740 psi | 89% | 3373 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 55,376 psi | 85% | 3340 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 57,682 psi | 89% | 3317 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,521 psi | 85% | 3281 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,740 psi | 89% | 3291 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,057 psi | 86% | 3291 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,854 psi | 86% | 3301 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 57,232 psi | 88% | 3340 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,235 psi | 65% | 3058 fps | 96% |
| Norma 201 | <<locked>> | 84% | 57,406 psi | 88% | 3307 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,262 psi | 90% | 3307 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,942 psi | 88% | 3350 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,289 psi | 87% | 3356 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 54,781 psi | 84% | 3428 fps | 98% |
| Norma URP | <<locked>> | 94% | 55,970 psi | 86% | 3366 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 58,146 psi | 89% | 3379 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,969 psi | 85% | 3360 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 58,030 psi | 89% | 3333 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 58,146 psi | 89% | 3356 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,463 psi | 56% | 2175 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,158 psi | 85% | 3291 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,882 psi | 84% | 3376 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,274 psi | 85% | 3419 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 57,566 psi | 89% | 3409 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,246 psi | 87% | 3438 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 57,754 psi | 89% | 3284 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,175 psi | 89% | 3310 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,247 psi | 90% | 3350 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,029 psi | 88% | 3392 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 57,899 psi | 89% | 3333 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,854 psi | 86% | 3301 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,521 psi | 85% | 3281 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,057 psi | 86% | 3291 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,232 psi | 88% | 3340 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,623 psi | 87% | 3360 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,724 psi | 87% | 3310 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,537 psi | 89% | 3337 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,436 psi | 90% | 3238 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,854 psi | 86% | 3182 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,753 psi | 86% | 3245 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,536 psi | 87% | 3386 fps | 97% |
| Somchem S335 | <<locked>> | 84% | 58,015 psi | 89% | 3232 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,449 psi | 87% | 3297 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 58,247 psi | 90% | 3350 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 55,158 psi | 85% | 3369 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 3363 fps | 98% |
| Vihtavuori N133 | <<locked>> | 82% | 55,317 psi | 85% | 3166 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,494 psi | 90% | 3268 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,332 psi | 85% | 3228 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,072 psi | 86% | 3264 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 58,349 psi | 90% | 3366 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,850 psi | 77% | 3202 fps | 96% |
| Vihtavuori N530 | <<locked>> | 82% | 58,088 psi | 89% | 3314 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 57,261 psi | 88% | 3274 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,464 psi | 88% | 3366 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,070 psi | 83% | 3360 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 58,668 psi | 90% | 3330 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,304 psi | 87% | 3383 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,685 psi | 67% | 3307 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,827 psi | 89% | 3346 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,476 psi | 84% | 3294 fps | 96.3% |
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 2495 | <<locked>> | 80% | 48,457 psi | 75% | 3110 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,166 psi | 73% | 3091 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 41,365 psi | 64% | 3038 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 45,890 psi | 71% | 3107 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,577 psi | 53% | 2897 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 51,837 psi | 80% | 3248 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 43,918 psi | 68% | 3071 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 96% | 51,387 psi | 79% | 3291 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,012 psi | 83% | 3255 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,530 psi | 75% | 3304 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,092 psi | 68% | 3094 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,297 psi | 73% | 3173 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,272 psi | 53% | 2920 fps | 95.1% |
| Alliant Reloder-17 | 73.8 gr | 80% | 38,769 psi | 60% | 3068 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 96% | 50,778 psi | 78% | 3274 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 32,184 psi | 50% | 2871 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 98% | 39,465 psi | 61% | 3084 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 38,130 psi | 59% | 3094 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,750 psi | 80% | 3255 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 44,338 psi | 68% | 3104 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 47,645 psi | 73% | 3140 fps | 95.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,954 psi | 83% | 3281 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,817 psi | 69% | 3110 fps | 97.8% |
| Hodgdon H414 | <<locked>> | 86% | 45,469 psi | 70% | 3169 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 86% | 48,892 psi | 75% | 3202 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 52,417 psi | 81% | 3261 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,589 psi | 49% | 2802 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,023 psi | 75% | 3228 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 45,179 psi | 70% | 3186 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 41% | 1903 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,270 psi | 77% | 3205 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 52,765 psi | 81% | 3248 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,122 psi | 71% | 3110 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,689 psi | 75% | 3143 fps | 96.6% |
| IMR 4350 | <<locked>> | 88% | 45,498 psi | 70% | 3107 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 82% | 43,439 psi | 67% | 3051 fps | 95% |
| IMR 4831 | <<locked>> | 82% | 35,882 psi | 55% | 2920 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 48,559 psi | 75% | 3212 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 54,012 psi | 83% | 3255 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,822 psi | 80% | 3219 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,981 psi | 78% | 3173 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 46,282 psi | 71% | 3114 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 40,582 psi | 62% | 2986 fps | 95.8% |
| Lovex S070 | <<locked>> | 86% | 44,237 psi | 68% | 3087 fps | 95.7% |
| Lovex S071 | <<locked>> | 98% | 39,421 psi | 61% | 2992 fps | 95% |
| Norma 201 | <<locked>> | 80% | 50,546 psi | 78% | 3189 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,097 psi | 79% | 3189 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,688 psi | 72% | 3159 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 52,460 psi | 81% | 3287 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 44,034 psi | 68% | 3205 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 37,275 psi | 57% | 2972 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 47,079 psi | 72% | 3179 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 41,611 psi | 64% | 3084 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 54,215 psi | 83% | 3268 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,215 psi | 83% | 3287 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 42% | 1949 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,020 psi | 69% | 3087 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,155 psi | 79% | 3310 fps | 99.5% |
| ReloadSwiss RS 60 | 73.8 gr | 80% | 41,278 psi | 64% | 3146 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 37,188 psi | 57% | 2986 fps | 95.6% |
| ReloadSwiss RS 70 | 78.7 gr | 84% | 39,131 psi | 60% | 3064 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 54,433 psi | 84% | 3232 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,037 psi | 74% | 3133 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 41,495 psi | 64% | 3035 fps | 99% |
| Rottweil R 905 | <<locked>> | 96% | 49,647 psi | 76% | 3251 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 47,645 psi | 73% | 3140 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 40,582 psi | 62% | 2986 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,822 psi | 80% | 3219 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,282 psi | 71% | 3114 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 44,237 psi | 68% | 3087 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,975 psi | 66% | 3097 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,837 psi | 81% | 3245 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,444 psi | 78% | 3212 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,517 psi | 79% | 3130 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,352 psi | 67% | 2969 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 42,685 psi | 66% | 2986 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 49,197 psi | 76% | 3245 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 51,256 psi | 79% | 3127 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,591 psi | 81% | 3232 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 42,134 psi | 65% | 3045 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 31,111 psi | 48% | 2841 fps | 97.2% |
| Somchem S385 | <<locked>> | 94% | 47,050 psi | 72% | 3166 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 52,083 psi | 80% | 3117 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,167 psi | 74% | 3107 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,544 psi | 75% | 3114 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,118 psi | 62% | 2963 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 36,158 psi | 56% | 2910 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 98% | 46,427 psi | 71% | 3133 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 54,462 psi | 84% | 3255 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,934 psi | 72% | 3100 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,621 psi | 55% | 2904 fps | 95% |
| Vihtavuori N555 | <<locked>> | 86% | 33,257 psi | 51% | 2897 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,621 psi | 55% | 2877 fps | 97.8% |
| Winchester 760 | <<locked>> | 86% | 45,643 psi | 70% | 3173 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 90% | 30,661 psi | 47% | 2907 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,386 psi | 78% | 3215 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 50,618 psi | 78% | 3222 fps | 95.4% |
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 113 powders for .300 PRC loaded with the .308 | 132gr | Brenneke TIG nature. Alliant Reloder-26 delivers the highest muzzle velocity at 3,488 fps; across all powders the maximum-charge window runs from 2,126 fps to 3,488 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 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 132.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .300 PRC with the .308 | 132gr | Brenneke TIG nature they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.