Load Specifications
Load data in caliber .300 Win. Mag. with .308 | 166gr | Peregrine Glider (Glider Tactical) bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Hodgdon Superformance.
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 2495 | <<locked>> | 84% | 52,808 psi | 85% | 2812 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 52,939 psi | 85% | 2828 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,761 psi | 77% | 2841 fps | 98.3% |
| Accurate 4064 | <<locked>> | 86% | 53,214 psi | 85% | 2864 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,737 psi | 86% | 2959 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 53,127 psi | 85% | 2894 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,360 psi | 87% | 2900 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,463 psi | 89% | 3002 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,448 psi | 89% | 2894 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,200 psi | 85% | 3018 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,679 psi | 88% | 2920 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,027 psi | 88% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,042 psi | 88% | 3025 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,333 psi | 90% | 3051 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,520 psi | 87% | 2989 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,008 psi | 77% | 2920 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,005 psi | 72% | 2864 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,450 psi | 63% | 2766 fps | 97% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,445 psi | 82% | 3054 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,968 psi | 85% | 2910 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 55,303 psi | 89% | 2936 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,008 psi | 77% | 2920 fps | 96% |
| Bofors RP7 | <<locked>> | 92% | 55,172 psi | 88% | 2917 fps | 98.2% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,172 psi | 88% | 2923 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,086 psi | 90% | 2953 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 54,346 psi | 87% | 2982 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 94% | 54,926 psi | 88% | 2949 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 82% | 53,737 psi | 86% | 2904 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,100 psi | 88% | 2943 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,998 psi | 87% | 2943 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,026 psi | 85% | 2992 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 58% | 1814 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,867 psi | 86% | 2894 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,130 psi | 90% | 2913 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,214 psi | 85% | 2874 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,709 psi | 89% | 2900 fps | 98.7% |
| IMR 4350 | <<locked>> | 96% | 56,057 psi | 90% | 2949 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,592 psi | 86% | 2894 fps | 98.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,172 psi | 88% | 2966 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 52,968 psi | 85% | 2917 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,448 psi | 89% | 2894 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,156 psi | 85% | 2867 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,724 psi | 89% | 2874 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,795 psi | 86% | 2877 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,301 psi | 85% | 2887 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 54,360 psi | 87% | 2927 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,378 psi | 63% | 2680 fps | 96.3% |
| Norma 201 | <<locked>> | 84% | 55,114 psi | 88% | 2887 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,854 psi | 90% | 2887 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,288 psi | 87% | 2930 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,040 psi | 85% | 2940 fps | 96.8% |
| Norma MRPᴾ | <<locked>> | 100% | 50,850 psi | 82% | 3009 fps | 98.1% |
| Norma URP | <<locked>> | 94% | 52,895 psi | 85% | 2949 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 55,114 psi | 88% | 2956 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,375 psi | 87% | 3031 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 96% | 55,405 psi | 89% | 3005 fps | 99.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,862 psi | 75% | 2871 fps | 96.3% |
| Ramshot TAC | <<locked>> | 82% | 55,695 psi | 89% | 2920 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,564 psi | 89% | 2933 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,419 psi | 58% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,318 psi | 90% | 2940 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,130 psi | 90% | 3015 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,927 psi | 90% | 3048 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,708 psi | 86% | 2982 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,750 psi | 85% | 3012 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 55,883 psi | 90% | 2864 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,666 psi | 89% | 2887 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,405 psi | 89% | 2930 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 53,708 psi | 86% | 2917 fps | 95.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,388 psi | 86% | 2969 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 55,172 psi | 88% | 2917 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,301 psi | 85% | 2887 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,156 psi | 85% | 2867 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,795 psi | 86% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,360 psi | 87% | 2927 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,679 psi | 86% | 2940 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,070 psi | 87% | 2894 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,201 psi | 89% | 2920 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,939 psi | 85% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,824 psi | 86% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,026 psi | 85% | 2838 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,895 psi | 85% | 2963 fps | 97.1% |
| Somchem S335 | <<locked>> | 84% | 55,840 psi | 90% | 2818 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,882 psi | 86% | 2884 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,550 psi | 89% | 2930 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,274 psi | 89% | 3005 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,230 psi | 87% | 2949 fps | 98.1% |
| Unknown powder | <<locked>> | 92% | 53,693 psi | 86% | 2956 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 84% | 53,185 psi | 85% | 2759 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,941 psi | 90% | 2848 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,695 psi | 89% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,519 psi | 86% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,288 psi | 87% | 2927 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 86% | 55,463 psi | 89% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,433 psi | 87% | 2972 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,343 psi | 81% | 2943 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,129 psi | 88% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,346 psi | 87% | 2982 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,437 psi | 65% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 52,852 psi | 85% | 2917 fps | 96.8% |
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 2495 | <<locked>> | 80% | 46,151 psi | 74% | 2710 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,250 psi | 69% | 2654 fps | 95.4% |
| Accurate 3100 | <<locked>> | 92% | 35,998 psi | 58% | 2605 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 43,729 psi | 70% | 2710 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,764 psi | 53% | 2543 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 49,864 psi | 80% | 2841 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,293 psi | 68% | 2687 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 48,617 psi | 78% | 2884 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,040 psi | 83% | 2841 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,195 psi | 74% | 2894 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,235 psi | 68% | 2707 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,426 psi | 73% | 2779 fps | 99.5% |
| Alliant Reloder-16 | 55.4 gr | 80% | 32,779 psi | 53% | 2559 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,927 psi | 59% | 2694 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,718 psi | 77% | 2867 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,744 psi | 72% | 2858 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,587 psi | 46% | 2467 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,999 psi | 59% | 2703 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 88% | 32,982 psi | 53% | 2644 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,516 psi | 79% | 2851 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 42,250 psi | 68% | 2717 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 44,744 psi | 72% | 2858 fps | 95.1% |
| Bofors RP7 | <<locked>> | 84% | 42,714 psi | 68% | 2690 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,532 psi | 83% | 2867 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,888 psi | 69% | 2723 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 82% | 40,915 psi | 66% | 2730 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 45,368 psi | 73% | 2779 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 50,430 psi | 81% | 2851 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,124 psi | 48% | 2454 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,005 psi | 71% | 2776 fps | 99.9% |
| Hodgdon Superformance | 67.8 gr | 86% | 42,583 psi | 68% | 2795 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 43% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,643 psi | 72% | 2733 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 46,514 psi | 75% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,437 psi | 66% | 2661 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,046 psi | 66% | 2631 fps | 95.6% |
| IMR 4350 | <<locked>> | 88% | 43,337 psi | 69% | 2723 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,727 psi | 67% | 2671 fps | 95.7% |
| IMR 4831 | <<locked>> | 82% | 30,705 psi | 49% | 2474 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 46,586 psi | 75% | 2808 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,040 psi | 83% | 2841 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,559 psi | 79% | 2812 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,182 psi | 79% | 2769 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,396 psi | 71% | 2720 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,405 psi | 58% | 2556 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 39,523 psi | 63% | 2648 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 36,912 psi | 59% | 2625 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 48,501 psi | 78% | 2782 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,153 psi | 79% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,759 psi | 72% | 2766 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 46,282 psi | 74% | 2818 fps | 95.1% |
| Norma MRP | <<locked>> | 94% | 41,060 psi | 66% | 2812 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 33,112 psi | 53% | 2549 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 44,831 psi | 72% | 2782 fps | 99.6% |
| Ramshot Grand | <<locked>> | 98% | 50,415 psi | 81% | 2959 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 84% | 36,883 psi | 59% | 2648 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 98% | 43,410 psi | 70% | 2802 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 51,938 psi | 83% | 2861 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,982 psi | 83% | 2877 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,050 psi | 43% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,221 psi | 69% | 2707 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,631 psi | 78% | 2894 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,349 psi | 63% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,576 psi | 52% | 2559 fps | 95.3% |
| ReloadSwiss RS 70 | 62.1 gr | 82% | 34,592 psi | 55% | 2628 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 52,460 psi | 84% | 2815 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,151 psi | 74% | 2733 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,755 psi | 64% | 2661 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 96% | 50,328 psi | 81% | 2861 fps | 95% |
| Rottweil R 905 | <<locked>> | 96% | 46,601 psi | 75% | 2851 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 42,714 psi | 68% | 2690 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,405 psi | 58% | 2556 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,559 psi | 79% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,396 psi | 71% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 39,523 psi | 63% | 2648 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,886 psi | 66% | 2713 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,502 psi | 81% | 2838 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,298 psi | 77% | 2808 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,806 psi | 80% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,771 psi | 67% | 2589 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,669 psi | 65% | 2612 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,166 psi | 74% | 2844 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 49,313 psi | 79% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,372 psi | 81% | 2828 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,205 psi | 64% | 2661 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 29,631 psi | 48% | 2497 fps | 97.9% |
| Somchem S385 | <<locked>> | 92% | 41,365 psi | 66% | 2717 fps | 95.1% |
| Unknown powder | <<locked>> | 80% | 35,897 psi | 58% | 2608 fps | 96.1% |
| Vihtavuori N133 | <<locked>> | 80% | 46,934 psi | 75% | 2667 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,282 psi | 74% | 2707 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,137 psi | 74% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,476 psi | 55% | 2510 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 35,810 psi | 57% | 2579 fps | 96.7% |
| Vihtavuori N540 | <<locked>> | 80% | 45,730 psi | 73% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,390 psi | 58% | 2625 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 86% | 31,154 psi | 50% | 2543 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,953 psi | 54% | 2526 fps | 98.3% |
| Winchester 760 | <<locked>> | 82% | 40,915 psi | 66% | 2730 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,905 psi | 43% | 2487 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,614 psi | 73% | 2789 fps | 95% |
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 100 powders for .300 Win. Mag. loaded with the .308 | 166gr | Peregrine Glider (Glider Tactical). Alliant Reloder-26 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,054 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 166.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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. ReloadSwiss RS 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .300 Win. Mag. with the .308 | 166gr | Peregrine Glider (Glider Tactical) they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.