Load Specifications
Load data in caliber .300 PRC with .308 | 165gr | Geco STAR bullet and 82 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 ADI AR 2213.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 58,407 psi | 90% | 3022 fps | 99.4% |
| Accurate 3100 | <<locked>> | 98% | 58,552 psi | 90% | 3077 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,943 psi | 89% | 2992 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,231 psi | 87% | 3061 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,464 psi | 88% | 3173 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 84% | 57,682 psi | 89% | 3028 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,363 psi | 88% | 3120 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 54,911 psi | 84% | 3114 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,509 psi | 62% | 2867 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,405 psi | 85% | 3002 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,145 psi | 88% | 3123 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 58,697 psi | 90% | 3143 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,840 psi | 87% | 3104 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 58,508 psi | 90% | 3173 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,651 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,416 psi | 79% | 3084 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,217 psi | 86% | 3179 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,348 psi | 88% | 3150 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 56,159 psi | 86% | 3015 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,311 psi | 73% | 2999 fps | 96.6% |
| Bofors RP5 | <<locked>> | 98% | 58,508 psi | 90% | 3173 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 55,448 psi | 85% | 3009 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,589 psi | 78% | 3028 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 82% | 56,391 psi | 87% | 3038 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 58,334 psi | 90% | 3123 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 57,377 psi | 88% | 3077 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 55,027 psi | 85% | 3051 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,638 psi | 89% | 3097 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,392 psi | 88% | 3041 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,256 psi | 77% | 3136 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 86% | 54,853 psi | 84% | 3094 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 57% | 1929 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,087 psi | 88% | 3012 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,043 psi | 88% | 3048 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,130 psi | 88% | 3038 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 56,594 psi | 87% | 3054 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,246 psi | 87% | 3038 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 98% | 56,565 psi | 87% | 3153 fps | 98% |
| Lovex S062 | <<locked>> | 82% | 57,435 psi | 88% | 3002 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,479 psi | 88% | 3035 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,419 psi | 85% | 3025 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,040 psi | 80% | 2976 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 58,465 psi | 90% | 3064 fps | 100% |
| Norma 204 | <<locked>> | 90% | 58,175 psi | 89% | 3107 fps | 98.9% |
| Norma MRP | <<locked>> | 96% | 58,494 psi | 90% | 3196 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 58,581 psi | 90% | 3104 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,334 psi | 88% | 3176 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 57,377 psi | 88% | 3107 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,637 psi | 86% | 3107 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,376 psi | 58% | 1972 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,318 psi | 87% | 3025 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 58,349 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,391 psi | 87% | 3087 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,708 psi | 84% | 3114 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,894 psi | 78% | 3133 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 56,434 psi | 87% | 3015 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 58,697 psi | 90% | 3087 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 94% | 56,057 psi | 86% | 3091 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 55,448 psi | 85% | 3009 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,479 psi | 88% | 3035 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,435 psi | 88% | 3002 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,419 psi | 85% | 3025 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 58,276 psi | 90% | 3077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,811 psi | 87% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,840 psi | 87% | 2986 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,608 psi | 86% | 3084 fps | 98.8% |
| Somchem S355 | <<locked>> | 84% | 56,217 psi | 86% | 3009 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,695 psi | 87% | 3018 fps | 97.3% |
| Somchem S365 | <<locked>> | 92% | 58,639 psi | 90% | 3100 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,666 psi | 87% | 3064 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 86% | 57,711 psi | 89% | 2982 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,811 psi | 87% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,202 psi | 86% | 3041 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 58,160 psi | 89% | 2979 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,709 psi | 86% | 3041 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,928 psi | 89% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 58,421 psi | 90% | 3189 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,969 psi | 83% | 3094 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,550 psi | 87% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 58,537 psi | 90% | 3123 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,913 psi | 88% | 3225 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,927 psi | 88% | 3061 fps | 98.8% |
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% | 54,708 psi | 84% | 2963 fps | 99.1% |
| Accurate 3100 | <<locked>> | 82% | 33,489 psi | 52% | 2592 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 54,172 psi | 83% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,395 psi | 65% | 2818 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 92% | 49,588 psi | 76% | 3031 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 50,923 psi | 78% | 2920 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,828 psi | 63% | 2802 fps | 95.2% |
| ADI AR 2213 | 82.2 gr | 92% | 47,935 psi | 74% | 2982 fps | 96% |
| ADI AR 2225 | <<locked>> | 96% | 35,520 psi | 55% | 2736 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,851 psi | 80% | 2946 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,857 psi | 63% | 2828 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,181 psi | 73% | 2959 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,698 psi | 63% | 2792 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 88% | 41,452 psi | 64% | 2848 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,023 psi | 46% | 2559 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,126 psi | 49% | 2638 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,692 psi | 50% | 2687 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 41,060 psi | 63% | 2838 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 52,663 psi | 81% | 2959 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 44,034 psi | 68% | 2933 fps | 95.6% |
| Bofors RP5 | <<locked>> | 88% | 41,452 psi | 64% | 2848 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 45,745 psi | 70% | 2835 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 96% | 44,063 psi | 68% | 2894 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 52,736 psi | 81% | 2976 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,338 psi | 68% | 2871 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 47,210 psi | 73% | 2894 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 90% | 47,892 psi | 74% | 2923 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,978 psi | 72% | 2907 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,493 psi | 59% | 2710 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 41,002 psi | 63% | 2923 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 43,787 psi | 67% | 2887 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 42% | 1722 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,592 psi | 82% | 2956 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,292 psi | 64% | 2753 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,152 psi | 73% | 2864 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 40,480 psi | 62% | 2762 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,340 psi | 71% | 2858 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 92% | 45,788 psi | 70% | 2949 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 53,954 psi | 83% | 2949 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,512 psi | 68% | 2805 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 42,830 psi | 66% | 2789 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 32,692 psi | 50% | 2569 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 54,737 psi | 84% | 3005 fps | 100% |
| Norma 204 | <<locked>> | 80% | 41,118 psi | 63% | 2785 fps | 95.1% |
| Norma MRP | 77.4 gr | 84% | 37,768 psi | 58% | 2792 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 41,887 psi | 64% | 2808 fps | 99.2% |
| Ramshot Grand | <<locked>> | 92% | 45,818 psi | 70% | 2959 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 40,828 psi | 63% | 2799 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 90% | 37,826 psi | 58% | 2756 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 43% | 1765 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,576 psi | 81% | 2959 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,125 psi | 77% | 3009 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,482 psi | 65% | 2838 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,901 psi | 63% | 2851 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,811 psi | 58% | 2835 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 49,414 psi | 76% | 2900 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 45,165 psi | 69% | 2844 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 39,958 psi | 61% | 2779 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 45,745 psi | 70% | 2835 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,512 psi | 68% | 2805 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 53,954 psi | 83% | 2949 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,830 psi | 66% | 2789 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,024 psi | 78% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,009 psi | 77% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,584 psi | 67% | 2749 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,610 psi | 61% | 2769 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 49,400 psi | 76% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,429 psi | 76% | 2894 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 38,638 psi | 59% | 2759 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,710 psi | 58% | 2697 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 47,326 psi | 73% | 2822 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,395 psi | 67% | 2808 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 40,132 psi | 62% | 2740 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 54,549 psi | 84% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,699 psi | 66% | 2805 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 33,649 psi | 52% | 2644 fps | 97.8% |
| Vihtavuori N560 | 83 gr | 90% | 47,253 psi | 73% | 2986 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 96% | 46,789 psi | 72% | 2959 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,598 psi | 66% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,512 psi | 68% | 2871 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,556 psi | 41% | 2539 fps | 97% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,743 psi | 66% | 2805 fps | 95.9% |
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 88 powders for .300 PRC loaded with the .308 | 165gr | Geco STAR. Winchester StaBALL HD delivers the highest muzzle velocity at 3,225 fps; across all powders the maximum-charge window runs from 1,929 fps to 3,225 fps. ADI AR 2217 gives the best case fill at 100 %, and 88 of the 88 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 165.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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. Norma MRP, Vihtavuori N560, ADI AR 2213 rank at the top here: for .300 PRC with the .308 | 165gr | Geco STAR they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Norma 217, ReloadSwiss RS 80 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.