Load Specifications
Load data in caliber .300 PRC with .308 | 166gr | Hammer Stone Hammer bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 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% | 57,522 psi | 88% | 2995 fps | 99.3% |
| Accurate 3100 | <<locked>> | 98% | 57,159 psi | 88% | 3048 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 56,739 psi | 87% | 2963 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 54,998 psi | 85% | 3035 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,970 psi | 86% | 3140 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 56,898 psi | 88% | 3005 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,159 psi | 86% | 3087 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 57,653 psi | 89% | 3150 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,610 psi | 61% | 2838 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,899 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 58,088 psi | 89% | 3051 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,130 psi | 86% | 3097 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,522 psi | 88% | 3114 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,477 psi | 85% | 3074 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,130 psi | 88% | 3140 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,986 psi | 89% | 3114 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,024 psi | 77% | 3048 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,549 psi | 84% | 3146 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 3120 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 55,085 psi | 85% | 2989 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,905 psi | 71% | 2963 fps | 96.1% |
| Bofors RP5 | <<locked>> | 98% | 57,130 psi | 88% | 3140 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 58,160 psi | 89% | 3041 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,516 psi | 76% | 2992 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 55,376 psi | 85% | 3009 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,014 psi | 88% | 3091 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 56,260 psi | 87% | 3048 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 96% | 57,725 psi | 89% | 3084 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,608 psi | 87% | 3068 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,246 psi | 87% | 3015 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,081 psi | 76% | 3100 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 88% | 57,841 psi | 89% | 3130 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,695 psi | 56% | 1913 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,202 psi | 86% | 2986 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 58,697 psi | 90% | 3028 fps | 99.7% |
| IMR 4350 | <<locked>> | 90% | 56,057 psi | 86% | 3022 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,057 psi | 86% | 3009 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 55,448 psi | 85% | 3025 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 58,784 psi | 90% | 3068 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 98% | 55,274 psi | 85% | 3120 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 56,521 psi | 87% | 2979 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,376 psi | 87% | 3005 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,914 psi | 89% | 3051 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,618 psi | 78% | 2943 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 57,377 psi | 88% | 3035 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,985 psi | 88% | 3077 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 57,116 psi | 88% | 3166 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 57,203 psi | 88% | 3074 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 58,595 psi | 90% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,767 psi | 86% | 3136 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 56,173 psi | 86% | 3077 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,983 psi | 83% | 3071 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,304 psi | 57% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,216 psi | 85% | 2992 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,753 psi | 87% | 3100 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,071 psi | 85% | 3058 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,406 psi | 88% | 3146 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,501 psi | 76% | 3097 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 58,160 psi | 89% | 2986 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 55,361 psi | 85% | 2989 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,551 psi | 89% | 3058 fps | 98% |
| Rottweil R 905 | <<locked>> | 96% | 58,610 psi | 90% | 3120 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 58,160 psi | 89% | 3041 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,376 psi | 87% | 3005 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,521 psi | 87% | 2979 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,914 psi | 89% | 3051 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,305 psi | 88% | 3051 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,970 psi | 86% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,840 psi | 86% | 2956 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 58,131 psi | 89% | 3114 fps | 99.1% |
| Somchem S355 | <<locked>> | 86% | 58,813 psi | 90% | 3035 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,579 psi | 86% | 2989 fps | 97% |
| Somchem S365 | <<locked>> | 92% | 57,464 psi | 88% | 3077 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,332 psi | 85% | 3031 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 86% | 56,579 psi | 87% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,680 psi | 86% | 3015 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 58,711 psi | 90% | 3068 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 57,232 psi | 88% | 2953 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 58,523 psi | 90% | 3074 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,405 psi | 87% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,087 psi | 88% | 3159 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,547 psi | 81% | 3061 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,245 psi | 85% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,232 psi | 88% | 3094 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,100 psi | 85% | 3192 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,680 psi | 86% | 3031 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% | 53,809 psi | 83% | 2933 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 32,663 psi | 50% | 2562 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 53,171 psi | 82% | 2910 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,510 psi | 64% | 2789 fps | 99.2% |
| Accurate MAGPRO | 86.2 gr | 94% | 51,880 psi | 80% | 3064 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 50,096 psi | 77% | 2894 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,757 psi | 66% | 2835 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 92% | 46,905 psi | 72% | 2949 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 36,956 psi | 57% | 2766 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,937 psi | 78% | 2920 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,505 psi | 84% | 2999 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,030 psi | 62% | 2799 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,122 psi | 71% | 2930 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,569 psi | 65% | 2825 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,495 psi | 62% | 2818 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,327 psi | 45% | 2533 fps | 97.4% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,328 psi | 48% | 2605 fps | 95% |
| Alliant Reloder-26 | 74.2 gr | 80% | 31,778 psi | 49% | 2654 fps | 96.1% |
| Bofors RP15 | <<locked>> | 92% | 42,743 psi | 66% | 2867 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 51,576 psi | 79% | 2933 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 42,844 psi | 66% | 2897 fps | 95.1% |
| Bofors RP5 | <<locked>> | 88% | 40,495 psi | 62% | 2818 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 44,976 psi | 69% | 2805 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 96% | 43,004 psi | 66% | 2858 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 51,909 psi | 80% | 2949 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 43,555 psi | 67% | 2844 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 46,282 psi | 71% | 2864 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 50,270 psi | 77% | 2956 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,255 psi | 76% | 2940 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,623 psi | 58% | 2684 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,059 psi | 62% | 2887 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 42,786 psi | 66% | 2858 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 42% | 1713 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,678 psi | 81% | 2930 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,926 psi | 85% | 2969 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 40,582 psi | 62% | 2726 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,412 psi | 71% | 2835 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 39,682 psi | 61% | 2736 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,631 psi | 75% | 2890 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 92% | 44,904 psi | 69% | 2920 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 53,026 psi | 82% | 2927 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,729 psi | 67% | 2779 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 42,061 psi | 65% | 2762 fps | 97.5% |
| Lovex S071 | <<locked>> | 88% | 34,026 psi | 52% | 2598 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 53,824 psi | 83% | 2979 fps | 100% |
| Norma 204 | <<locked>> | 82% | 43,250 psi | 67% | 2822 fps | 95.8% |
| Norma MRP | 75.7 gr | 84% | 36,941 psi | 57% | 2762 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 41,060 psi | 63% | 2782 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 54,795 psi | 84% | 3009 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 44,759 psi | 69% | 2930 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 39,929 psi | 61% | 2769 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 92% | 39,726 psi | 61% | 2792 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 43% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,663 psi | 79% | 2933 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,023 psi | 75% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,524 psi | 64% | 2808 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,045 psi | 62% | 2822 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,753 psi | 57% | 2792 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 54,737 psi | 84% | 2936 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,501 psi | 75% | 2877 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,324 psi | 68% | 2815 fps | 95% |
| Rottweil R 905 | <<locked>> | 86% | 41,829 psi | 64% | 2812 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 44,976 psi | 69% | 2805 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,729 psi | 67% | 2779 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 53,026 psi | 82% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,061 psi | 65% | 2762 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,024 psi | 77% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,313 psi | 76% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,873 psi | 66% | 2723 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,510 psi | 64% | 2805 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 48,515 psi | 75% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,486 psi | 75% | 2864 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,753 psi | 58% | 2736 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 39,581 psi | 61% | 2730 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 46,514 psi | 72% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,598 psi | 66% | 2782 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 39,218 psi | 60% | 2713 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,766 psi | 83% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,959 psi | 65% | 2782 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 32,822 psi | 50% | 2615 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 92% | 49,559 psi | 76% | 3022 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 96% | 45,571 psi | 70% | 2927 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,640 psi | 64% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,555 psi | 67% | 2844 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,918 psi | 40% | 2507 fps | 96.5% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,843 psi | 64% | 2776 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 91 powders for .300 PRC loaded with the .308 | 166gr | Hammer Stone Hammer. Winchester StaBALL HD delivers the highest muzzle velocity at 3,192 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,192 fps. ADI AR 2217 gives the best case fill at 100 %, and 91 of the 91 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 166.0 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. Accurate MAGPRO, Alliant Reloder-26, Norma MRP rank at the top here: for .300 PRC with the .308 | 166gr | Hammer Stone Hammer they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, 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.