Load Specifications
Load data in caliber .300 PRC with .308 | 155gr | Merlin Virtus bullet and 92 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP 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.
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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>> | 82% | 57,000 psi | 88% | 3012 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 58,682 psi | 90% | 3097 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,522 psi | 88% | 3140 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 57,624 psi | 89% | 3071 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,419 psi | 85% | 3133 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,289 psi | 87% | 3228 fps | 96% |
| ADI AR 2208 | <<locked>> | 86% | 57,841 psi | 89% | 3114 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,695 psi | 87% | 3182 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 58,204 psi | 90% | 3241 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,870 psi | 89% | 3245 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,682 psi | 90% | 3133 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,259 psi | 85% | 3104 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,536 psi | 87% | 3199 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,059 psi | 89% | 3222 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,130 psi | 86% | 3169 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,392 psi | 88% | 3232 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,273 psi | 83% | 3153 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,876 psi | 72% | 3071 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,781 psi | 84% | 3241 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,605 psi | 81% | 3146 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 55,956 psi | 86% | 3094 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,392 psi | 88% | 3232 fps | 98.5% |
| Bofors RP7 | <<locked>> | 88% | 55,390 psi | 85% | 3084 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 56,362 psi | 87% | 3114 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,740 psi | 89% | 3192 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 57,188 psi | 88% | 3146 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 98% | 58,537 psi | 90% | 3182 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,188 psi | 88% | 3159 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,753 psi | 87% | 3114 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,001 psi | 89% | 3153 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,006 psi | 71% | 3110 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 90% | 58,653 psi | 90% | 3232 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,405 psi | 56% | 1972 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 58,233 psi | 90% | 3117 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,145 psi | 88% | 3094 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,144 psi | 86% | 3074 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 56,724 psi | 87% | 3117 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,174 psi | 88% | 3114 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 55,927 psi | 86% | 3123 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,710 psi | 87% | 3133 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,898 psi | 86% | 3104 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,651 psi | 86% | 3209 fps | 97% |
| Lovex S060 | <<locked>> | 82% | 58,494 psi | 90% | 3077 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,406 psi | 88% | 3087 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,188 psi | 88% | 3107 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 55,201 psi | 85% | 3097 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,471 psi | 73% | 2969 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 58,537 psi | 90% | 3097 fps | 100% |
| Norma 203B | <<locked>> | 84% | 58,189 psi | 90% | 3143 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,870 psi | 89% | 3176 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 57,435 psi | 88% | 3261 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 57,972 psi | 89% | 3179 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,593 psi | 86% | 3114 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,318 psi | 87% | 3232 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 56,811 psi | 87% | 3179 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,372 psi | 77% | 3091 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 57% | 2018 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,217 psi | 86% | 3097 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,450 psi | 88% | 3212 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,564 psi | 85% | 3156 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 58,189 psi | 90% | 3251 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,282 psi | 71% | 3107 fps | 98.1% |
| Rottweil R 902 | <<locked>> | 82% | 55,680 psi | 86% | 3045 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,028 psi | 86% | 3091 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 58,291 psi | 90% | 3153 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 96% | 55,216 psi | 85% | 3153 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 55,390 psi | 85% | 3084 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,188 psi | 88% | 3107 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 57,406 psi | 88% | 3087 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,201 psi | 85% | 3097 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 58,146 psi | 89% | 3159 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 58,624 psi | 90% | 3127 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,855 psi | 87% | 2972 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,971 psi | 88% | 3058 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,624 psi | 90% | 3209 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 55,898 psi | 86% | 3087 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,376 psi | 87% | 3084 fps | 96.4% |
| Somchem S365 | <<locked>> | 94% | 57,682 psi | 89% | 3176 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,970 psi | 86% | 3127 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 56,231 psi | 87% | 3002 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,391 psi | 87% | 3015 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,580 psi | 89% | 3061 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,260 psi | 87% | 3114 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,361 psi | 85% | 3100 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 84% | 58,305 psi | 90% | 3061 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,419 psi | 85% | 3117 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,550 psi | 87% | 3179 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,522 psi | 88% | 3251 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,130 psi | 86% | 3077 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,957 psi | 89% | 3196 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,357 psi | 77% | 3222 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,217 psi | 86% | 3120 fps | 98.1% |
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% | 53,316 psi | 82% | 2959 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,271 psi | 79% | 2972 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 35,172 psi | 54% | 2700 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 50,575 psi | 78% | 2966 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,899 psi | 60% | 2815 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 96% | 52,359 psi | 81% | 3156 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 47,921 psi | 74% | 2943 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 43,337 psi | 67% | 2927 fps | 95% |
| ADI AR 2213 | <<locked>> | 96% | 50,821 psi | 78% | 3107 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,838 psi | 83% | 3179 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,530 psi | 75% | 2969 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,793 psi | 80% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,855 psi | 58% | 2828 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,410 psi | 67% | 2969 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 43,047 psi | 66% | 2917 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 43,569 psi | 67% | 2969 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,601 psi | 42% | 2549 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,721 psi | 52% | 2746 fps | 95.2% |
| Alliant Reloder-26 | 75.9 gr | 82% | 31,937 psi | 49% | 2733 fps | 95.2% |
| Bofors RP15 | <<locked>> | 94% | 42,960 psi | 66% | 2953 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 48,805 psi | 75% | 2976 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 43,569 psi | 67% | 2969 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,772 psi | 66% | 2838 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 80% | 49,255 psi | 76% | 2992 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 41,046 psi | 63% | 2871 fps | 96.2% |
| Hodgdon H4350 | <<locked>> | 80% | 43,859 psi | 67% | 2897 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 94% | 50,937 psi | 78% | 3051 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,432 psi | 82% | 3097 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,288 psi | 54% | 2710 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,172 psi | 83% | 3094 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,873 psi | 66% | 3031 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 40,132 psi | 62% | 2881 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 42% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,607 psi | 84% | 3058 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,401 psi | 78% | 2982 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,707 psi | 81% | 3015 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 41,031 psi | 63% | 2815 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,396 psi | 68% | 2874 fps | 97% |
| IMR 4831 | <<locked>> | 80% | 37,318 psi | 57% | 2762 fps | 97.8% |
| IMR 4895 | <<locked>> | 80% | 53,171 psi | 82% | 3074 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 52,475 psi | 81% | 3045 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 96% | 48,385 psi | 74% | 3071 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 54,940 psi | 85% | 3022 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,459 psi | 78% | 2972 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,698 psi | 64% | 2818 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 39,842 psi | 61% | 2789 fps | 96.1% |
| Lovex S071 | <<locked>> | 92% | 36,347 psi | 56% | 2733 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 54,897 psi | 84% | 3041 fps | 100% |
| Norma 203B | <<locked>> | 80% | 51,155 psi | 79% | 3028 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,801 psi | 67% | 2913 fps | 95% |
| Norma MRP | 79.1 gr | 88% | 39,914 psi | 61% | 2913 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,638 psi | 59% | 2808 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 51,895 psi | 80% | 3054 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 48,457 psi | 75% | 3084 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 37,565 psi | 58% | 2792 fps | 96% |
| Ramshot Magnum | <<locked>> | 96% | 43,134 psi | 66% | 2943 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,702 psi | 43% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,313 psi | 76% | 2976 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,151 psi | 71% | 3028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,885 psi | 60% | 2835 fps | 97.8% |
| ReloadSwiss RS 70 | 73.4 gr | 80% | 37,695 psi | 58% | 2844 fps | 97.2% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,929 psi | 61% | 2949 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 52,185 psi | 80% | 2989 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,847 psi | 71% | 2917 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,863 psi | 74% | 2966 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 45,063 psi | 69% | 2963 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 42,772 psi | 66% | 2838 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,698 psi | 64% | 2818 fps | 97.7% |
| Shooters World Precision | <<locked>> | 80% | 50,459 psi | 78% | 2972 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,842 psi | 61% | 2789 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,355 psi | 73% | 2979 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,853 psi | 84% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,021 psi | 72% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,741 psi | 63% | 2753 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 44,672 psi | 69% | 2953 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,195 psi | 71% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 52,721 psi | 81% | 3018 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 35,143 psi | 54% | 2759 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 39,943 psi | 61% | 2815 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,634 psi | 81% | 2949 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,881 psi | 81% | 2963 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,106 psi | 68% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,161 psi | 62% | 2815 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 92% | 42,148 psi | 65% | 2854 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 51,213 psi | 79% | 2956 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,566 psi | 61% | 2812 fps | 98% |
| Vihtavuori N555 | <<locked>> | 80% | 30,530 psi | 47% | 2631 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 94% | 49,893 psi | 77% | 3110 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,291 psi | 60% | 2779 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 41,205 psi | 63% | 2874 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,020 psi | 40% | 2572 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 45,310 psi | 70% | 2927 fps | 95.7% |
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 92 powders for .300 PRC loaded with the .308 | 155gr | Merlin Virtus. Norma MRP delivers the highest muzzle velocity at 3,261 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,261 fps. Accurate 3100 gives the best case fill at 100 %, and 92 of the 92 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, 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. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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-26, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .300 PRC with the .308 | 155gr | Merlin Virtus 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.