Load Specifications
Load data in caliber .300 PRC with .308 | 165gr | Barnes MRX BT bullet and 85 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate MAGPRO and Norma MRP.
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% | 57,595 psi | 89% | 3002 fps | 99.3% |
| Accurate 3100 | <<locked>> | 98% | 57,305 psi | 88% | 3058 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 57,116 psi | 88% | 2976 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,071 psi | 85% | 3045 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,086 psi | 86% | 3146 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 56,985 psi | 88% | 3018 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,362 psi | 87% | 3100 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 57,769 psi | 89% | 3159 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,697 psi | 61% | 2848 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 58,015 psi | 89% | 3038 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 58,204 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,202 psi | 86% | 3107 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,522 psi | 88% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,666 psi | 86% | 3084 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,319 psi | 88% | 3150 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 58,378 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,328 psi | 77% | 3061 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,940 psi | 85% | 3156 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,173 psi | 86% | 3130 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 55,376 psi | 85% | 3002 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,209 psi | 71% | 2976 fps | 96.2% |
| Bofors RP5 | <<locked>> | 98% | 57,319 psi | 88% | 3150 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 58,218 psi | 90% | 3051 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,647 psi | 76% | 3005 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 55,709 psi | 86% | 3022 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,246 psi | 88% | 3100 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 56,536 psi | 87% | 3061 fps | 99% |
| Hodgdon H4831 | <<locked>> | 96% | 57,856 psi | 89% | 3097 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,753 psi | 87% | 3077 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,478 psi | 87% | 3028 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,226 psi | 76% | 3110 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 88% | 58,015 psi | 89% | 3143 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 56% | 1923 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,333 psi | 87% | 2995 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 58,784 psi | 90% | 3041 fps | 99.7% |
| IMR 4350 | <<locked>> | 90% | 56,101 psi | 86% | 3031 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,318 psi | 87% | 3022 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 55,506 psi | 85% | 3035 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,361 psi | 85% | 3022 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 98% | 55,405 psi | 85% | 3130 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 56,652 psi | 87% | 2989 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,652 psi | 87% | 3018 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 58,160 psi | 89% | 3064 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,865 psi | 78% | 2956 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 57,493 psi | 88% | 3048 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,188 psi | 88% | 3091 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 57,276 psi | 88% | 3176 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 57,493 psi | 88% | 3087 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,115 psi | 86% | 3153 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 56,391 psi | 87% | 3091 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,302 psi | 84% | 3084 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,449 psi | 58% | 1965 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,492 psi | 85% | 3005 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,043 psi | 88% | 3114 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,317 psi | 85% | 3068 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,841 psi | 89% | 3159 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,763 psi | 77% | 3110 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 58,291 psi | 90% | 2999 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 55,477 psi | 85% | 2999 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,754 psi | 89% | 3068 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 96% | 58,798 psi | 90% | 3133 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 88% | 58,218 psi | 90% | 3051 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,652 psi | 87% | 3018 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,652 psi | 87% | 2989 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 58,160 psi | 89% | 3064 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,348 psi | 88% | 3061 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,086 psi | 86% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,057 psi | 86% | 2969 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 58,320 psi | 90% | 3127 fps | 99.1% |
| Somchem S355 | <<locked>> | 84% | 55,477 psi | 85% | 2995 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,709 psi | 86% | 2999 fps | 97% |
| Somchem S365 | <<locked>> | 92% | 57,725 psi | 89% | 3087 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,535 psi | 85% | 3041 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 86% | 56,826 psi | 87% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,738 psi | 86% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,114 psi | 85% | 3022 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 57,537 psi | 89% | 2966 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 58,697 psi | 90% | 3084 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,623 psi | 87% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,261 psi | 88% | 3169 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,707 psi | 81% | 3071 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,419 psi | 85% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,450 psi | 88% | 3104 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,521 psi | 85% | 3209 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,825 psi | 86% | 3041 fps | 98.6% |
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% | 53,867 psi | 83% | 2943 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 32,735 psi | 50% | 2569 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 53,330 psi | 82% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,626 psi | 64% | 2802 fps | 99.2% |
| Accurate MAGPRO | 86.9 gr | 94% | 52,243 psi | 80% | 3081 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 50,241 psi | 77% | 2907 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,975 psi | 66% | 2844 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 92% | 47,079 psi | 72% | 2963 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 37,231 psi | 57% | 2782 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,082 psi | 79% | 2930 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,621 psi | 84% | 3009 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,161 psi | 62% | 2812 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,412 psi | 71% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,815 psi | 66% | 2838 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,553 psi | 62% | 2828 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,428 psi | 45% | 2543 fps | 97.4% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,517 psi | 48% | 2618 fps | 95% |
| Alliant Reloder-26 | 74.8 gr | 80% | 31,966 psi | 49% | 2667 fps | 96.1% |
| Bofors RP15 | <<locked>> | 92% | 42,946 psi | 66% | 2881 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 51,677 psi | 80% | 2943 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,018 psi | 66% | 2910 fps | 95.2% |
| Bofors RP5 | <<locked>> | 88% | 40,553 psi | 62% | 2828 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 45,092 psi | 69% | 2815 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 96% | 43,163 psi | 66% | 2871 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 52,025 psi | 80% | 2963 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 43,656 psi | 67% | 2854 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 46,369 psi | 71% | 2874 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 50,444 psi | 78% | 2969 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,443 psi | 76% | 2949 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,768 psi | 58% | 2694 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,205 psi | 62% | 2900 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 42,844 psi | 66% | 2867 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 42% | 1716 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,823 psi | 81% | 2943 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 55,042 psi | 85% | 2979 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 40,683 psi | 63% | 2740 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,514 psi | 72% | 2844 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 39,784 psi | 61% | 2746 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,646 psi | 75% | 2900 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 92% | 44,918 psi | 69% | 2930 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 53,171 psi | 82% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,845 psi | 67% | 2789 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 42,163 psi | 65% | 2772 fps | 97.5% |
| Lovex S071 | <<locked>> | 88% | 34,258 psi | 53% | 2608 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 53,940 psi | 83% | 2992 fps | 100% |
| Norma 204 | <<locked>> | 82% | 43,294 psi | 67% | 2828 fps | 95.7% |
| Norma MRP | 76.2 gr | 84% | 37,014 psi | 57% | 2772 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 41,176 psi | 63% | 2792 fps | 99.1% |
| Ramshot Grand | <<locked>> | 92% | 44,918 psi | 69% | 2940 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 40,045 psi | 62% | 2779 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 92% | 39,900 psi | 61% | 2805 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,934 psi | 43% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,909 psi | 80% | 2946 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,342 psi | 76% | 2995 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,611 psi | 64% | 2818 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,132 psi | 62% | 2831 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,985 psi | 57% | 2808 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 54,897 psi | 84% | 2946 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,631 psi | 75% | 2887 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,411 psi | 68% | 2825 fps | 95% |
| Rottweil R 905 | <<locked>> | 86% | 41,930 psi | 65% | 2818 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,092 psi | 69% | 2815 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,845 psi | 67% | 2789 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 53,171 psi | 82% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,163 psi | 65% | 2772 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,125 psi | 77% | 2946 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,443 psi | 76% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,960 psi | 66% | 2733 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,568 psi | 64% | 2815 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 48,660 psi | 75% | 2884 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,646 psi | 75% | 2874 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,884 psi | 58% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,115 psi | 57% | 2680 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 46,630 psi | 72% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,699 psi | 66% | 2795 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 39,262 psi | 60% | 2720 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,853 psi | 83% | 2913 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,047 psi | 65% | 2792 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 32,953 psi | 51% | 2625 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 92% | 49,748 psi | 77% | 3035 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 96% | 45,716 psi | 70% | 2936 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,872 psi | 64% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,830 psi | 67% | 2854 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,005 psi | 40% | 2513 fps | 96.5% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,018 psi | 65% | 2785 fps | 95.6% |
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 85 powders for .300 PRC loaded with the .308 | 165gr | Barnes MRX BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,209 fps. ADI AR 2225 gives the best case fill at 100 %, and 85 of the 85 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 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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, Accurate MAGPRO, Norma MRP rank at the top here: for .300 PRC with the .308 | 165gr | Barnes MRX BT 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.