Load Specifications
Load data in caliber .300 PRC with .308 | 155gr | Frontier RSBT bullet and 85 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.
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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 2700 | <<locked>> | 82% | 55,985 psi | 86% | 3051 fps | 98.7% |
| Accurate 3100 | <<locked>> | 98% | 55,506 psi | 85% | 3107 fps | 99.6% |
| Accurate 4064 | <<locked>> | 82% | 55,796 psi | 86% | 3041 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,305 psi | 88% | 3159 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,856 psi | 89% | 3255 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 55,579 psi | 86% | 3074 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 58,088 psi | 89% | 3205 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 55,738 psi | 86% | 3199 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,536 psi | 87% | 3100 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,724 psi | 87% | 3123 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,769 psi | 89% | 3215 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,317 psi | 85% | 3179 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,566 psi | 89% | 3192 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,158 psi | 85% | 3192 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,825 psi | 86% | 3176 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,312 psi | 74% | 3100 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,536 psi | 87% | 3268 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,128 psi | 83% | 3173 fps | 97.9% |
| Bofors RP3 | <<locked>> | 84% | 57,667 psi | 89% | 3117 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,158 psi | 85% | 3192 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 56,608 psi | 87% | 3100 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 57,914 psi | 89% | 3136 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,347 psi | 85% | 3150 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 58,523 psi | 90% | 3169 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 55,854 psi | 86% | 3136 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 58,523 psi | 90% | 3182 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 58,276 psi | 90% | 3136 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,456 psi | 73% | 3140 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 88% | 55,840 psi | 86% | 3186 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,593 psi | 56% | 1975 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,508 psi | 90% | 3114 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,377 psi | 88% | 3094 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 58,073 psi | 89% | 3140 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,175 psi | 89% | 3130 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 57,566 psi | 89% | 3146 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,218 psi | 90% | 3153 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,174 psi | 88% | 3123 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,058 psi | 88% | 3232 fps | 97.4% |
| Lovex S062 | <<locked>> | 84% | 58,711 psi | 90% | 3104 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,624 psi | 90% | 3127 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 56,550 psi | 87% | 3117 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,298 psi | 76% | 2999 fps | 99% |
| Norma 203B | <<locked>> | 82% | 56,014 psi | 86% | 3107 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,303 psi | 85% | 3133 fps | 97.9% |
| Norma MRP | <<locked>> | 96% | 54,998 psi | 85% | 3219 fps | 99.2% |
| Norma URP | <<locked>> | 90% | 55,564 psi | 85% | 3136 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,000 psi | 88% | 3133 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,856 psi | 89% | 3255 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 58,262 psi | 90% | 3196 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,909 psi | 80% | 3117 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,376 psi | 58% | 2021 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,595 psi | 89% | 3117 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,769 psi | 90% | 3228 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,232 psi | 88% | 3179 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,405 psi | 85% | 3205 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,790 psi | 74% | 3136 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,043 psi | 88% | 3061 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,754 psi | 89% | 3114 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,941 psi | 86% | 3110 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 96% | 56,782 psi | 87% | 3176 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 56,608 psi | 87% | 3100 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,624 psi | 90% | 3127 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 58,711 psi | 90% | 3104 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,550 psi | 87% | 3117 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,767 psi | 86% | 3120 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 58,131 psi | 89% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,218 psi | 90% | 3077 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,304 psi | 87% | 3169 fps | 98.3% |
| Somchem S355 | <<locked>> | 86% | 57,450 psi | 88% | 3107 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,711 psi | 89% | 3104 fps | 96.7% |
| Somchem S365 | <<locked>> | 92% | 55,521 psi | 85% | 3143 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,566 psi | 89% | 3150 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 82% | 57,609 psi | 89% | 3018 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,769 psi | 89% | 3031 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,216 psi | 85% | 3025 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,711 psi | 89% | 3133 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,840 psi | 87% | 3123 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 55,956 psi | 86% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,927 psi | 88% | 3140 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 58,334 psi | 90% | 3205 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,013 psi | 85% | 3209 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,522 psi | 88% | 3094 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,564 psi | 85% | 3156 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,199 psi | 80% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,682 psi | 89% | 3143 fps | 98.4% |
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 2700 | <<locked>> | 80% | 52,446 psi | 81% | 2992 fps | 98.2% |
| Accurate 3100 | <<locked>> | 86% | 36,767 psi | 57% | 2740 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 52,359 psi | 81% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,466 psi | 62% | 2844 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 96% | 53,954 psi | 83% | 3186 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 48,994 psi | 75% | 2963 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 44,469 psi | 68% | 2949 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 94% | 48,646 psi | 75% | 3061 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,792 psi | 77% | 2989 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,069 psi | 82% | 3061 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,001 psi | 60% | 2854 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,686 psi | 69% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 44,208 psi | 68% | 2940 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 45,049 psi | 69% | 2999 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,805 psi | 44% | 2585 fps | 96.4% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,896 psi | 54% | 2779 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 82% | 33,446 psi | 51% | 2776 fps | 96% |
| Bofors RP15 | <<locked>> | 94% | 44,266 psi | 68% | 2979 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,488 psi | 78% | 3002 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 45,049 psi | 69% | 2999 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 44,135 psi | 68% | 2864 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 80% | 50,589 psi | 78% | 3012 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 42,293 psi | 65% | 2894 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 45,165 psi | 69% | 2920 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 94% | 52,054 psi | 80% | 3068 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 51,068 psi | 79% | 3051 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,695 psi | 56% | 2740 fps | 99% |
| Hodgdon Retumbo | <<locked>> | 96% | 41,524 psi | 64% | 2995 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,336 psi | 64% | 2904 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 42% | 1768 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,547 psi | 79% | 2999 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,737 psi | 83% | 3031 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 39,668 psi | 61% | 2782 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,426 psi | 70% | 2894 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 38,798 psi | 60% | 2795 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 54,476 psi | 84% | 3094 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 50,473 psi | 78% | 3005 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 49,763 psi | 77% | 3097 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 51,996 psi | 80% | 2995 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,931 psi | 66% | 2841 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 41,307 psi | 64% | 2822 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 35,592 psi | 55% | 2710 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 52,431 psi | 81% | 3048 fps | 100% |
| Norma 204 | <<locked>> | 84% | 45,121 psi | 69% | 2940 fps | 95.5% |
| Norma MRP | 77.5 gr | 86% | 38,406 psi | 59% | 2877 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 40,045 psi | 62% | 2838 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 53,113 psi | 82% | 3071 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 46,601 psi | 72% | 3041 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 38,928 psi | 60% | 2822 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 94% | 41,481 psi | 64% | 2904 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,847 psi | 43% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,502 psi | 78% | 2995 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,413 psi | 73% | 3048 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,292 psi | 62% | 2861 fps | 98.2% |
| ReloadSwiss RS 70 | 73.6 gr | 80% | 38,856 psi | 60% | 2871 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,464 psi | 59% | 2907 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,751 psi | 83% | 3012 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,514 psi | 73% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 49,182 psi | 76% | 2992 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 43,526 psi | 67% | 2927 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 44,135 psi | 68% | 2864 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,931 psi | 66% | 2841 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 51,996 psi | 80% | 2995 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,307 psi | 64% | 2822 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,762 psi | 75% | 2999 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,298 psi | 74% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,119 psi | 65% | 2782 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 43,149 psi | 66% | 2920 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 47,543 psi | 73% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 50,459 psi | 78% | 2979 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,680 psi | 56% | 2795 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 41,307 psi | 64% | 2844 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 54,186 psi | 83% | 2969 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,273 psi | 83% | 2982 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,527 psi | 70% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,408 psi | 64% | 2838 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 90% | 40,785 psi | 63% | 2822 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 52,446 psi | 81% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,872 psi | 63% | 2838 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,126 psi | 49% | 2671 fps | 96.5% |
| Vihtavuori N560 | 84.8 gr | 94% | 51,329 psi | 79% | 3140 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,582 psi | 62% | 2802 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 42,453 psi | 65% | 2897 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 27,369 psi | 42% | 2621 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 90% | 43,526 psi | 67% | 2887 fps | 95.2% |
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 94 powders for .300 PRC loaded with the .308 | 155gr | Frontier RSBT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,268 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,268 fps. ADI AR 2217 gives the best case fill at 100 %, and 94 of the 94 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 1:10.5 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 | Frontier RSBT 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.