Load Specifications
Load data in caliber .300 PRC with .308 | 166gr | Peregrine Glider GRM bullet and 88 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 Alliant Reloder-26.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 56,623 psi | 87% | 2976 fps | 99.2% |
| Accurate 3100 | <<locked>> | 98% | 56,043 psi | 86% | 3028 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 56,043 psi | 86% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,841 psi | 89% | 3074 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,723 psi | 84% | 3117 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 56,101 psi | 86% | 2992 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,056 psi | 85% | 3068 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 56,637 psi | 87% | 3127 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,725 psi | 60% | 2812 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,058 psi | 88% | 3012 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,246 psi | 88% | 3038 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 58,697 psi | 90% | 3133 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,420 psi | 87% | 3100 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 58,334 psi | 90% | 3114 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,086 psi | 86% | 3120 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,782 psi | 87% | 3097 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,066 psi | 75% | 3031 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,653 psi | 89% | 3192 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,984 psi | 85% | 3100 fps | 98.6% |
| Bofors RP3 | <<locked>> | 84% | 58,204 psi | 90% | 3031 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 56,086 psi | 86% | 3120 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 57,246 psi | 88% | 3025 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,501 psi | 75% | 2972 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 84% | 58,305 psi | 90% | 3051 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,057 psi | 86% | 3074 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 55,564 psi | 85% | 3031 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 96% | 56,710 psi | 87% | 3064 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,593 psi | 86% | 3048 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,245 psi | 85% | 2999 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,979 psi | 74% | 3074 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 88% | 56,753 psi | 87% | 3114 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 56% | 1903 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,376 psi | 85% | 2972 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,972 psi | 89% | 3015 fps | 99.7% |
| IMR 4350 | <<locked>> | 90% | 55,216 psi | 85% | 3005 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,347 psi | 85% | 2992 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 58,233 psi | 90% | 3064 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,784 psi | 90% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,812 psi | 89% | 3048 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,899 psi | 89% | 3159 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 55,695 psi | 86% | 2963 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,680 psi | 86% | 2992 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 57,000 psi | 88% | 3035 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,792 psi | 77% | 2927 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 56,536 psi | 87% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,130 psi | 86% | 3058 fps | 98.5% |
| Norma MRP | <<locked>> | 96% | 55,753 psi | 86% | 3143 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 56,217 psi | 86% | 3058 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,638 psi | 89% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,723 psi | 84% | 3117 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 90% | 55,288 psi | 85% | 3061 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,823 psi | 81% | 3048 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,333 psi | 57% | 1952 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 58,305 psi | 90% | 3038 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,825 psi | 86% | 3087 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,841 psi | 89% | 3097 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,492 psi | 87% | 3133 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,298 psi | 74% | 3071 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 82% | 57,479 psi | 88% | 2976 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 58,291 psi | 90% | 3028 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,724 psi | 87% | 3041 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 96% | 57,740 psi | 89% | 3104 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 57,246 psi | 88% | 3025 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,680 psi | 86% | 2992 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 55,695 psi | 86% | 2963 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,000 psi | 88% | 3035 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,318 psi | 87% | 3035 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 58,668 psi | 90% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,726 psi | 90% | 2995 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,276 psi | 88% | 3100 fps | 98.9% |
| Somchem S355 | <<locked>> | 86% | 58,001 psi | 89% | 3022 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 58,523 psi | 90% | 3031 fps | 97.5% |
| Somchem S365 | <<locked>> | 92% | 56,376 psi | 87% | 3061 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 58,218 psi | 90% | 3074 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 58,131 psi | 89% | 2930 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 58,262 psi | 90% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,811 psi | 86% | 2943 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 58,479 psi | 90% | 3051 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,754 psi | 89% | 3051 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 56,492 psi | 87% | 2940 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,392 psi | 88% | 3054 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,448 psi | 85% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,825 psi | 86% | 3133 fps | 97.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,372 psi | 79% | 3038 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 58,305 psi | 90% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,289 psi | 87% | 3077 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,490 psi | 82% | 3173 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 58,595 psi | 90% | 3074 fps | 98.9% |
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% | 52,866 psi | 81% | 2913 fps | 98.7% |
| Accurate 3100 | <<locked>> | 84% | 34,360 psi | 53% | 2605 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 52,446 psi | 81% | 2900 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,698 psi | 63% | 2772 fps | 99% |
| Accurate MAGPRO | <<locked>> | 94% | 50,894 psi | 78% | 3048 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 49,472 psi | 76% | 2881 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,134 psi | 65% | 2818 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 92% | 45,963 psi | 71% | 2927 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 36,274 psi | 56% | 2746 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,285 psi | 77% | 2907 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,650 psi | 83% | 2982 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,407 psi | 61% | 2785 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,310 psi | 70% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,916 psi | 64% | 2812 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 42,511 psi | 65% | 2861 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,848 psi | 44% | 2516 fps | 97.2% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,938 psi | 51% | 2651 fps | 95.8% |
| Alliant Reloder-26 | 73.1 gr | 80% | 31,169 psi | 48% | 2635 fps | 95.7% |
| Bofors RP15 | <<locked>> | 92% | 41,930 psi | 65% | 2848 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,705 psi | 78% | 2917 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 42,511 psi | 65% | 2861 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 44,251 psi | 68% | 2789 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 98% | 45,237 psi | 70% | 2904 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 51,140 psi | 79% | 2936 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,801 psi | 66% | 2825 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 80% | 45,527 psi | 70% | 2848 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 92% | 49,269 psi | 76% | 2936 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 48,269 psi | 74% | 2917 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,999 psi | 57% | 2671 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 94% | 39,218 psi | 60% | 2864 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 41,930 psi | 65% | 2838 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,311 psi | 42% | 1703 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,069 psi | 80% | 2917 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,186 psi | 83% | 2953 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 39,900 psi | 61% | 2710 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,876 psi | 71% | 2822 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 38,928 psi | 60% | 2720 fps | 98.8% |
| IMR 4895 | <<locked>> | 80% | 55,071 psi | 85% | 3009 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 47,863 psi | 74% | 2877 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 94% | 47,079 psi | 72% | 2963 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 52,199 psi | 80% | 2907 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,178 psi | 66% | 2766 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 41,350 psi | 64% | 2743 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 33,344 psi | 51% | 2579 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 53,011 psi | 82% | 2966 fps | 100% |
| Norma 204 | <<locked>> | 82% | 42,554 psi | 65% | 2805 fps | 95.5% |
| Norma MRP | 74.5 gr | 84% | 36,172 psi | 56% | 2743 fps | 95% |
| Norma URP | <<locked>> | 80% | 40,277 psi | 62% | 2762 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 53,809 psi | 83% | 2989 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 43,845 psi | 67% | 2907 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 39,233 psi | 60% | 2749 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 92% | 38,899 psi | 60% | 2769 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 43% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,937 psi | 78% | 2917 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,138 psi | 74% | 2969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,596 psi | 62% | 2789 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,233 psi | 60% | 2802 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,841 psi | 60% | 2848 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 80% | 53,882 psi | 83% | 2920 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,645 psi | 73% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 46,499 psi | 72% | 2858 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 86% | 40,973 psi | 63% | 2792 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,251 psi | 68% | 2789 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,178 psi | 66% | 2766 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 52,199 psi | 80% | 2907 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,350 psi | 64% | 2743 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,240 psi | 76% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,689 psi | 75% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,206 psi | 65% | 2707 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 40,611 psi | 62% | 2782 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 47,877 psi | 74% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 47,790 psi | 74% | 2848 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,927 psi | 57% | 2717 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 38,914 psi | 60% | 2713 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 54,578 psi | 84% | 2881 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,636 psi | 84% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,730 psi | 70% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,829 psi | 64% | 2766 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 88% | 38,479 psi | 59% | 2694 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 53,011 psi | 82% | 2890 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,249 psi | 63% | 2762 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 32,213 psi | 50% | 2598 fps | 97.2% |
| Vihtavuori N560 | 81.6 gr | 92% | 48,544 psi | 75% | 3002 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 47,790 psi | 74% | 2969 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,017 psi | 63% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,801 psi | 66% | 2825 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,425 psi | 39% | 2484 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,075 psi | 63% | 2756 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 | 166gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 3,192 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,192 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 53–90 %, leaving at least 10 % headroom. The 166.0 gr projectile in 0.308" calls for a 1:10.0 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, Alliant Reloder-26 rank at the top here: for .300 PRC with the .308 | 166gr | Peregrine Glider GRM they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Norma 217 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.