Load Specifications
Load data in caliber .300 PRC with .308 | 155gr | Atomic 29 HP bullet and 87 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and ReloadSwiss RS 70.
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 2495 | <<locked>> | 82% | 58,450 psi | 90% | 3035 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 56,115 psi | 86% | 3064 fps | 98.8% |
| Accurate 3100 | <<locked>> | 98% | 55,448 psi | 85% | 3110 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 55,419 psi | 85% | 3041 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,101 psi | 88% | 3163 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 58,421 psi | 90% | 3268 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 55,463 psi | 85% | 3077 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 58,494 psi | 90% | 3215 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 55,985 psi | 86% | 3209 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,507 psi | 87% | 3104 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,739 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 58,204 psi | 90% | 3228 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,680 psi | 86% | 3186 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,711 psi | 89% | 3202 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,419 psi | 85% | 3202 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,202 psi | 86% | 3182 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,602 psi | 75% | 3107 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,956 psi | 88% | 3278 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,317 psi | 84% | 3179 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 57,435 psi | 88% | 3120 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,419 psi | 85% | 3202 fps | 98.3% |
| Bofors RP7 | <<locked>> | 88% | 56,666 psi | 87% | 3110 fps | 99% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,993 psi | 74% | 3041 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 84% | 57,740 psi | 89% | 3140 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,608 psi | 86% | 3159 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 58,653 psi | 90% | 3179 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 96% | 56,173 psi | 86% | 3150 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,853 psi | 84% | 3123 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 58,552 psi | 90% | 3146 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,471 psi | 73% | 3146 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 88% | 56,173 psi | 86% | 3199 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,564 psi | 56% | 1982 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,421 psi | 90% | 3117 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,450 psi | 88% | 3104 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 58,320 psi | 90% | 3150 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,378 psi | 90% | 3140 fps | 99.5% |
| IMR 4831 | <<locked>> | 92% | 57,667 psi | 89% | 3153 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,218 psi | 90% | 3159 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,493 psi | 88% | 3136 fps | 97% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,348 psi | 88% | 3245 fps | 97.6% |
| Lovex S062 | <<locked>> | 84% | 58,668 psi | 90% | 3107 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,610 psi | 90% | 3136 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 56,637 psi | 87% | 3123 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,240 psi | 76% | 3005 fps | 99% |
| Norma 203B | <<locked>> | 82% | 56,043 psi | 86% | 3114 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,477 psi | 85% | 3140 fps | 98% |
| Norma MRP | <<locked>> | 96% | 55,201 psi | 85% | 3228 fps | 99.3% |
| Norma URP | <<locked>> | 90% | 55,840 psi | 86% | 3146 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,145 psi | 88% | 3140 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 58,262 psi | 90% | 3268 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 58,450 psi | 90% | 3205 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,344 psi | 81% | 3127 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,304 psi | 57% | 2031 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,638 psi | 89% | 3123 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,201 psi | 85% | 3179 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,276 psi | 88% | 3186 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,767 psi | 86% | 3215 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,935 psi | 74% | 3146 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 82% | 57,000 psi | 88% | 3068 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,711 psi | 89% | 3117 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,115 psi | 86% | 3123 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 96% | 57,087 psi | 88% | 3189 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 56,666 psi | 87% | 3110 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,610 psi | 90% | 3136 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 58,668 psi | 90% | 3107 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,637 psi | 87% | 3123 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,709 psi | 86% | 3123 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 58,233 psi | 90% | 2995 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,349 psi | 90% | 3084 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,623 psi | 87% | 3182 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 57,334 psi | 88% | 3110 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 58,015 psi | 89% | 3114 fps | 96.9% |
| Somchem S365 | <<locked>> | 92% | 55,738 psi | 86% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,479 psi | 88% | 3156 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 82% | 57,464 psi | 88% | 3022 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,841 psi | 89% | 3038 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,288 psi | 85% | 3031 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,812 psi | 89% | 3140 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,261 psi | 88% | 3133 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 55,898 psi | 86% | 3031 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,014 psi | 88% | 3143 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 58,552 psi | 90% | 3212 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,288 psi | 85% | 3219 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,841 psi | 89% | 3104 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,811 psi | 86% | 3163 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,794 psi | 81% | 3258 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 58,088 psi | 89% | 3156 fps | 98.5% |
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% | 54,752 psi | 84% | 2982 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,547 psi | 81% | 3002 fps | 98.3% |
| Accurate 3100 | <<locked>> | 86% | 36,347 psi | 56% | 2733 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 51,996 psi | 80% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,147 psi | 62% | 2844 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 96% | 54,259 psi | 83% | 3196 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,936 psi | 75% | 2966 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 44,483 psi | 68% | 2953 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 94% | 48,863 psi | 75% | 3071 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,647 psi | 76% | 2989 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,069 psi | 82% | 3068 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,885 psi | 60% | 2858 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,657 psi | 69% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 44,382 psi | 68% | 2946 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 42,061 psi | 65% | 2936 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,500 psi | 44% | 2579 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,766 psi | 53% | 2779 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 82% | 33,141 psi | 51% | 2769 fps | 95.9% |
| Bofors RP15 | <<locked>> | 94% | 44,454 psi | 68% | 2989 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 50,285 psi | 77% | 3005 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 42,061 psi | 65% | 2936 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 43,859 psi | 67% | 2867 fps | 96.6% |
| Hodgdon H1000 | <<locked>> | 98% | 44,715 psi | 69% | 2972 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 50,473 psi | 78% | 3015 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 42,177 psi | 65% | 2897 fps | 96.7% |
| Hodgdon H4350 | <<locked>> | 80% | 45,150 psi | 69% | 2927 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 94% | 52,373 psi | 81% | 3081 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 51,372 psi | 79% | 3061 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,492 psi | 56% | 2740 fps | 99% |
| Hodgdon Retumbo | <<locked>> | 96% | 41,524 psi | 64% | 3002 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 41,408 psi | 64% | 2913 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 42% | 1772 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,474 psi | 79% | 3005 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,853 psi | 83% | 3041 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 39,465 psi | 61% | 2785 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,281 psi | 70% | 2900 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 38,435 psi | 59% | 2789 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 54,491 psi | 84% | 3100 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 50,589 psi | 78% | 3012 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 96% | 49,966 psi | 77% | 3107 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 51,779 psi | 80% | 2999 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,786 psi | 66% | 2844 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 40,944 psi | 63% | 2818 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 35,201 psi | 54% | 2703 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 52,446 psi | 81% | 3054 fps | 100% |
| Norma 204 | <<locked>> | 84% | 44,976 psi | 69% | 2943 fps | 95.6% |
| Norma MRP | 79.3 gr | 86% | 38,377 psi | 59% | 2877 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 39,813 psi | 61% | 2838 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 53,301 psi | 82% | 3077 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 46,528 psi | 72% | 3048 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 38,769 psi | 60% | 2822 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 94% | 41,553 psi | 64% | 2910 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 43% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,415 psi | 78% | 2999 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,456 psi | 73% | 3054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,190 psi | 62% | 2864 fps | 98.3% |
| ReloadSwiss RS 70 | 75.3 gr | 80% | 38,798 psi | 60% | 2874 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,392 psi | 59% | 2910 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 53,534 psi | 82% | 3012 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,166 psi | 73% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 49,182 psi | 76% | 2995 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 43,468 psi | 67% | 2927 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 43,859 psi | 67% | 2867 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,786 psi | 66% | 2844 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 51,779 psi | 80% | 2999 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,944 psi | 63% | 2818 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,718 psi | 75% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,095 psi | 74% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,742 psi | 64% | 2782 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 43,091 psi | 66% | 2923 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 47,427 psi | 73% | 2946 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 50,575 psi | 78% | 2986 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 36,405 psi | 56% | 2789 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 41,104 psi | 63% | 2844 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 53,896 psi | 83% | 2972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,143 psi | 83% | 2986 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,281 psi | 70% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,321 psi | 64% | 2841 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 90% | 40,640 psi | 63% | 2825 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 52,388 psi | 81% | 2976 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,669 psi | 63% | 2838 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 31,662 psi | 49% | 2661 fps | 96.4% |
| Vihtavuori N560 | 86.7 gr | 94% | 51,561 psi | 79% | 3150 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,553 psi | 62% | 2805 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 42,351 psi | 65% | 2900 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,876 psi | 41% | 2608 fps | 96.1% |
| Winchester Supreme 780 | <<locked>> | 90% | 43,511 psi | 67% | 2894 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 95 powders for .300 PRC loaded with the .308 | 155gr | Atomic 29 HP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,278 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,278 fps. ADI AR 2217 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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. Norma MRP, Vihtavuori N560, ReloadSwiss RS 70 rank at the top here: for .300 PRC with the .308 | 155gr | Atomic 29 HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Bofors RP30 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.