Load Specifications
Load data in caliber .300 PRC with .308 | 155gr | Norma GTX 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% | 56,130 psi | 86% | 3054 fps | 98.7% |
| Accurate 3100 | <<locked>> | 98% | 55,637 psi | 86% | 3107 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 55,956 psi | 86% | 3045 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,450 psi | 88% | 3159 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 58,189 psi | 90% | 3258 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 84% | 55,492 psi | 85% | 3071 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 58,189 psi | 90% | 3205 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 55,825 psi | 86% | 3199 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,710 psi | 87% | 3100 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,681 psi | 87% | 3123 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,928 psi | 89% | 3219 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,695 psi | 86% | 3182 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,667 psi | 89% | 3192 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,288 psi | 85% | 3192 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,231 psi | 87% | 3179 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,631 psi | 75% | 3104 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,710 psi | 87% | 3271 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,244 psi | 83% | 3176 fps | 97.9% |
| Bofors RP3 | <<locked>> | 84% | 57,827 psi | 89% | 3120 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 55,288 psi | 85% | 3192 fps | 98.2% |
| Bofors RP7 | <<locked>> | 88% | 56,753 psi | 87% | 3104 fps | 99% |
| Hodgdon H380 | <<locked>> | 84% | 58,059 psi | 89% | 3136 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,492 psi | 85% | 3150 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 58,653 psi | 90% | 3169 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 96% | 55,970 psi | 86% | 3136 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 58,682 psi | 90% | 3182 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 58,407 psi | 90% | 3136 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,529 psi | 73% | 3143 fps | 97.4% |
| Hodgdon Superformance | <<locked>> | 88% | 55,970 psi | 86% | 3189 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 56% | 1975 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,450 psi | 90% | 3110 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,334 psi | 88% | 3091 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 58,189 psi | 90% | 3140 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,305 psi | 90% | 3130 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 57,696 psi | 89% | 3150 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,175 psi | 89% | 3150 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,261 psi | 88% | 3123 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,203 psi | 88% | 3235 fps | 97.4% |
| Lovex S062 | <<locked>> | 82% | 55,347 psi | 85% | 3048 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,755 psi | 90% | 3130 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 56,681 psi | 87% | 3117 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,414 psi | 76% | 3002 fps | 99% |
| Norma 203B | <<locked>> | 82% | 55,970 psi | 86% | 3107 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,419 psi | 85% | 3133 fps | 97.9% |
| Norma MRP | <<locked>> | 96% | 55,129 psi | 85% | 3222 fps | 99.2% |
| Norma URP | <<locked>> | 90% | 55,738 psi | 86% | 3140 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,145 psi | 88% | 3133 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 58,204 psi | 90% | 3261 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 58,378 psi | 90% | 3199 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,025 psi | 80% | 3117 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,420 psi | 58% | 2021 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,725 psi | 89% | 3117 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,868 psi | 84% | 3173 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,363 psi | 88% | 3179 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,753 psi | 86% | 3212 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,863 psi | 74% | 3140 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,217 psi | 88% | 3061 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,928 psi | 89% | 3114 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,057 psi | 86% | 3114 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 96% | 56,884 psi | 88% | 3176 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 56,753 psi | 87% | 3104 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,755 psi | 90% | 3130 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 55,347 psi | 85% | 3048 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,681 psi | 87% | 3117 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,912 psi | 86% | 3120 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 58,305 psi | 90% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,334 psi | 90% | 3077 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,420 psi | 87% | 3173 fps | 98.4% |
| Somchem S355 | <<locked>> | 86% | 57,609 psi | 89% | 3110 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 58,044 psi | 89% | 3107 fps | 96.8% |
| Somchem S365 | <<locked>> | 92% | 55,666 psi | 86% | 3143 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,653 psi | 89% | 3150 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 82% | 57,754 psi | 89% | 3018 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,943 psi | 89% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,361 psi | 85% | 3028 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,914 psi | 89% | 3136 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,956 psi | 88% | 3123 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 56,115 psi | 86% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,058 psi | 88% | 3140 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 58,769 psi | 90% | 3209 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,172 psi | 85% | 3209 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,624 psi | 89% | 3094 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,695 psi | 86% | 3156 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,562 psi | 81% | 3251 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 58,015 psi | 89% | 3150 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% | 52,591 psi | 81% | 2992 fps | 98.2% |
| Accurate 3100 | <<locked>> | 84% | 34,476 psi | 53% | 2680 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 52,518 psi | 81% | 2989 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,625 psi | 63% | 2851 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 96% | 54,041 psi | 83% | 3186 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 49,110 psi | 76% | 2963 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 44,599 psi | 69% | 2949 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 94% | 48,762 psi | 75% | 3061 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,966 psi | 77% | 2992 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,214 psi | 82% | 3064 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,160 psi | 60% | 2858 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,846 psi | 69% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 44,338 psi | 68% | 2940 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 45,194 psi | 70% | 2999 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,906 psi | 44% | 2589 fps | 96.4% |
| Alliant Reloder-25 | <<locked>> | 90% | 35,143 psi | 54% | 2785 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 82% | 33,547 psi | 52% | 2779 fps | 96.1% |
| Bofors RP15 | <<locked>> | 94% | 44,556 psi | 69% | 2986 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 50,633 psi | 78% | 3005 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 45,194 psi | 70% | 2999 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 44,106 psi | 68% | 2864 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 80% | 50,749 psi | 78% | 3015 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 42,438 psi | 65% | 2897 fps | 96.7% |
| Hodgdon H4350 | <<locked>> | 80% | 45,266 psi | 70% | 2923 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 94% | 52,417 psi | 81% | 3074 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 51,169 psi | 79% | 3054 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,840 psi | 57% | 2743 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 96% | 41,611 psi | 64% | 2995 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,611 psi | 64% | 2910 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,441 psi | 42% | 1768 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,677 psi | 80% | 2999 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,896 psi | 83% | 3035 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 39,653 psi | 61% | 2782 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,571 psi | 70% | 2897 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 38,943 psi | 60% | 2795 fps | 98.3% |
| IMR 4895 | <<locked>> | 80% | 54,592 psi | 84% | 3094 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 50,575 psi | 78% | 3009 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 49,850 psi | 77% | 3100 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 51,938 psi | 80% | 2995 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,091 psi | 66% | 2841 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 41,408 psi | 64% | 2825 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 35,723 psi | 55% | 2710 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 52,576 psi | 81% | 3051 fps | 100% |
| Norma 204 | <<locked>> | 84% | 45,252 psi | 70% | 2943 fps | 95.5% |
| Norma MRP | 77.8 gr | 86% | 38,696 psi | 60% | 2881 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 40,205 psi | 62% | 2841 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 53,272 psi | 82% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 46,717 psi | 72% | 3045 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 39,073 psi | 60% | 2825 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 94% | 41,742 psi | 64% | 2910 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 43% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,647 psi | 78% | 2995 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,587 psi | 73% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,437 psi | 62% | 2864 fps | 98.3% |
| ReloadSwiss RS 70 | 73.8 gr | 80% | 38,972 psi | 60% | 2871 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,566 psi | 59% | 2910 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 53,722 psi | 83% | 3009 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,703 psi | 73% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 49,327 psi | 76% | 2992 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 43,656 psi | 67% | 2927 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 44,106 psi | 68% | 2864 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,091 psi | 66% | 2841 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 51,938 psi | 80% | 2995 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,408 psi | 64% | 2825 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,892 psi | 75% | 3002 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,269 psi | 74% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,264 psi | 65% | 2785 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 43,279 psi | 67% | 2920 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 47,674 psi | 73% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 50,734 psi | 78% | 2982 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 36,680 psi | 56% | 2792 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 41,423 psi | 64% | 2848 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 54,172 psi | 83% | 2966 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,418 psi | 84% | 2982 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,672 psi | 70% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,553 psi | 64% | 2838 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 90% | 40,930 psi | 63% | 2825 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 52,576 psi | 81% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,017 psi | 63% | 2841 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,242 psi | 50% | 2674 fps | 96.6% |
| Vihtavuori N560 | 85 gr | 94% | 51,459 psi | 79% | 3143 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,698 psi | 63% | 2805 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 42,569 psi | 65% | 2900 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 27,470 psi | 42% | 2628 fps | 96.5% |
| Winchester Supreme 780 | <<locked>> | 90% | 43,816 psi | 67% | 2890 fps | 95.3% |
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 | Norma GTX. Alliant Reloder-26 delivers the highest muzzle velocity at 3,271 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,271 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 1:13.5 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 | Norma GTX 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.