Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 176gr | Peregrine Glider GRM bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP 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.
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 2495 | <<locked>> | 82% | 55,898 psi | 88% | 2795 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,725 psi | 90% | 2884 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,898 psi | 88% | 2927 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 56,463 psi | 88% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,230 psi | 85% | 2920 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,505 psi | 85% | 3012 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 86% | 56,840 psi | 89% | 2894 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,419 psi | 87% | 2966 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,724 psi | 89% | 3022 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,623 psi | 89% | 3022 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,273 psi | 85% | 2867 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,404 psi | 85% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,303 psi | 87% | 2979 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,724 psi | 89% | 3002 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,737 psi | 86% | 2956 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3015 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,721 psi | 83% | 2940 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,716 psi | 72% | 2871 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,985 psi | 89% | 3087 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,198 psi | 80% | 2936 fps | 97.9% |
| Bofors RP3 | <<locked>> | 84% | 54,839 psi | 86% | 2877 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3015 fps | 98.7% |
| Bofors RP7 | <<locked>> | 88% | 54,462 psi | 85% | 2871 fps | 99% |
| Hodgdon H380 | <<locked>> | 84% | 55,463 psi | 87% | 2900 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,550 psi | 89% | 2976 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 88% | 56,231 psi | 88% | 2933 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 98% | 57,043 psi | 89% | 2966 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,811 psi | 87% | 2946 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,535 psi | 87% | 2900 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,811 psi | 89% | 2933 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,643 psi | 70% | 2904 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 90% | 57,043 psi | 89% | 3015 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,405 psi | 57% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,334 psi | 90% | 2897 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,246 psi | 88% | 2877 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,303 psi | 87% | 2861 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 55,550 psi | 87% | 2904 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,130 psi | 88% | 2897 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 54,824 psi | 86% | 2913 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 55,840 psi | 88% | 2913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,752 psi | 86% | 2894 fps | 96.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,099 psi | 85% | 2989 fps | 97.3% |
| Lovex S062 | <<locked>> | 84% | 56,507 psi | 89% | 2867 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,260 psi | 88% | 2894 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 57,522 psi | 90% | 2936 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,253 psi | 72% | 2769 fps | 98.9% |
| Norma 201 | <<locked>> | 82% | 57,595 psi | 90% | 2877 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,174 psi | 90% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,463 psi | 88% | 2959 fps | 98.5% |
| Norma MRP | <<locked>> | 98% | 55,477 psi | 87% | 3038 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 56,536 psi | 89% | 2956 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,491 psi | 85% | 2897 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,752 psi | 86% | 3012 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 55,390 psi | 87% | 2959 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,791 psi | 76% | 2881 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 58% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,201 psi | 87% | 2884 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,956 psi | 88% | 2989 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,215 psi | 85% | 2943 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,521 psi | 89% | 3028 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,773 psi | 70% | 2897 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 82% | 54,752 psi | 86% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,172 psi | 86% | 2877 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,130 psi | 90% | 2940 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 96% | 53,838 psi | 84% | 2940 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 54,462 psi | 85% | 2871 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,260 psi | 88% | 2894 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 56,507 psi | 89% | 2867 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,522 psi | 90% | 2936 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,840 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,130 psi | 88% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,782 psi | 87% | 2844 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,290 psi | 90% | 2995 fps | 98.9% |
| Somchem S355 | <<locked>> | 86% | 54,940 psi | 86% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,143 psi | 86% | 2874 fps | 96.7% |
| Somchem S365 | <<locked>> | 94% | 56,333 psi | 88% | 2959 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,520 psi | 85% | 2913 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 55,463 psi | 87% | 2789 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,593 psi | 87% | 2802 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,478 psi | 89% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,187 psi | 86% | 2900 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,954 psi | 85% | 2890 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 84% | 57,450 psi | 90% | 2851 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,230 psi | 85% | 2904 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,172 psi | 86% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,666 psi | 87% | 3028 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,868 psi | 86% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,782 psi | 89% | 2979 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,283 psi | 76% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,781 psi | 86% | 2913 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 2495 | <<locked>> | 80% | 52,388 psi | 82% | 2749 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,343 psi | 79% | 2766 fps | 98.3% |
| Accurate 3100 | <<locked>> | 86% | 34,301 psi | 54% | 2523 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 49,676 psi | 78% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,174 psi | 60% | 2625 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 96% | 50,778 psi | 80% | 2946 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 47,108 psi | 74% | 2736 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,482 psi | 67% | 2730 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 94% | 46,166 psi | 72% | 2831 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,765 psi | 83% | 2963 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,616 psi | 75% | 2759 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,068 psi | 80% | 2835 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,159 psi | 58% | 2638 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,467 psi | 67% | 2766 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,032 psi | 66% | 2720 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,496 psi | 67% | 2772 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,050 psi | 42% | 2382 fps | 96.4% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,909 psi | 52% | 2566 fps | 95.8% |
| Alliant Reloder-26 | 68 gr | 82% | 31,082 psi | 49% | 2556 fps | 95.8% |
| Bofors RP15 | <<locked>> | 94% | 41,858 psi | 66% | 2756 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 47,964 psi | 75% | 2769 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,496 psi | 67% | 2772 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 42,119 psi | 66% | 2644 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 80% | 48,399 psi | 76% | 2785 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 40,306 psi | 63% | 2677 fps | 96.8% |
| Hodgdon H4350 | <<locked>> | 80% | 43,163 psi | 68% | 2700 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 94% | 49,545 psi | 78% | 2841 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,457 psi | 76% | 2822 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,635 psi | 54% | 2526 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,098 psi | 83% | 2877 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,117 psi | 61% | 2766 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 39,276 psi | 62% | 2687 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 43% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,867 psi | 84% | 2848 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,559 psi | 78% | 2769 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,996 psi | 81% | 2805 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 37,826 psi | 59% | 2569 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,656 psi | 68% | 2677 fps | 97.5% |
| IMR 4831 | <<locked>> | 80% | 36,724 psi | 58% | 2582 fps | 98.3% |
| IMR 4895 | <<locked>> | 80% | 52,431 psi | 82% | 2861 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,167 psi | 75% | 2779 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 47,181 psi | 74% | 2864 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 49,821 psi | 78% | 2769 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,002 psi | 64% | 2625 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 39,276 psi | 62% | 2605 fps | 96.7% |
| Lovex S071 | <<locked>> | 90% | 33,228 psi | 52% | 2497 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 54,070 psi | 85% | 2825 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,415 psi | 79% | 2818 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,975 psi | 67% | 2717 fps | 95.6% |
| Norma MRP | 69.3 gr | 86% | 36,230 psi | 57% | 2657 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 38,014 psi | 60% | 2621 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 50,937 psi | 80% | 2844 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,224 psi | 74% | 2877 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 36,912 psi | 58% | 2608 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 94% | 38,928 psi | 61% | 2680 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,356 psi | 76% | 2769 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,194 psi | 71% | 2822 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,014 psi | 60% | 2644 fps | 98.3% |
| ReloadSwiss RS 70 | 65.8 gr | 80% | 36,898 psi | 58% | 2654 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,595 psi | 60% | 2753 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 51,430 psi | 81% | 2779 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,208 psi | 71% | 2717 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,963 psi | 74% | 2766 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 41,118 psi | 64% | 2700 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 42,119 psi | 66% | 2644 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,002 psi | 64% | 2625 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 49,821 psi | 78% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,276 psi | 62% | 2605 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,601 psi | 73% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,499 psi | 73% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,147 psi | 63% | 2569 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,741 psi | 64% | 2697 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 45,440 psi | 71% | 2717 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,124 psi | 75% | 2756 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 34,432 psi | 54% | 2575 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 38,986 psi | 61% | 2625 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 51,967 psi | 81% | 2740 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,228 psi | 82% | 2756 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,468 psi | 68% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,523 psi | 62% | 2625 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 90% | 38,508 psi | 60% | 2608 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 50,415 psi | 79% | 2749 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,841 psi | 61% | 2621 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 29,863 psi | 47% | 2457 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 94% | 48,457 psi | 76% | 2904 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,624 psi | 61% | 2592 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 40,306 psi | 63% | 2677 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,512 psi | 40% | 2411 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,263 psi | 65% | 2671 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 97 powders for .300 Weath. Mag. loaded with the .308 | 176gr | Peregrine Glider GRM. Alliant Reloder-26 delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,087 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 176.0 gr projectile in 0.308" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 176gr | 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, 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.