Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Peregrine Glider (Glider GRM) bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Hodgdon H414.
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% | 55,100 psi | 86% | 3018 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,421 psi | 90% | 3091 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,850 psi | 80% | 3054 fps | 98.6% |
| Accurate 4064 | <<locked>> | 86% | 55,622 psi | 87% | 3074 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,724 psi | 89% | 3179 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 55,201 psi | 87% | 3110 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,420 psi | 88% | 3114 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,462 psi | 85% | 3159 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,464 psi | 90% | 3107 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,825 psi | 87% | 3241 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,188 psi | 90% | 3136 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,406 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,638 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,506 psi | 87% | 3215 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 3212 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,749 psi | 80% | 3136 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,761 psi | 75% | 3077 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,640 psi | 65% | 2972 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,317 psi | 87% | 3287 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,303 psi | 87% | 3123 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 54,273 psi | 85% | 3097 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,749 psi | 80% | 3136 fps | 96.4% |
| Bofors RP7 | <<locked>> | 92% | 57,580 psi | 90% | 3133 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,566 psi | 90% | 3136 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,766 psi | 86% | 3110 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 55,709 psi | 87% | 3179 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 55,492 psi | 87% | 3136 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 55,796 psi | 87% | 3117 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,244 psi | 85% | 3104 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,144 psi | 88% | 3156 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,217 psi | 88% | 3219 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,042 psi | 56% | 1965 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,058 psi | 89% | 3120 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,405 psi | 88% | 3097 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,927 psi | 88% | 3097 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,332 psi | 87% | 3074 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 54,897 psi | 86% | 3104 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,869 psi | 88% | 3107 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 57,188 psi | 90% | 3169 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,216 psi | 87% | 3133 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,667 psi | 90% | 3146 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 82% | 57,464 psi | 90% | 3107 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,434 psi | 87% | 3081 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,667 psi | 90% | 3087 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,825 psi | 87% | 3087 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,506 psi | 87% | 3100 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 56,826 psi | 89% | 3140 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,887 psi | 66% | 2881 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 57,174 psi | 90% | 3100 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,447 psi | 85% | 3045 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,623 psi | 89% | 3146 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,782 psi | 87% | 3159 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 54,157 psi | 85% | 3235 fps | 98.4% |
| Norma URP | <<locked>> | 94% | 55,550 psi | 87% | 3166 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 53,911 psi | 84% | 3114 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,505 psi | 85% | 3163 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,593 psi | 57% | 2008 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,955 psi | 86% | 3094 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,592 psi | 86% | 3173 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,940 psi | 86% | 3212 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,768 psi | 89% | 3202 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,738 psi | 87% | 3238 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 54,447 psi | 85% | 3048 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,157 psi | 85% | 3087 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,188 psi | 88% | 3130 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 3192 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 57,580 psi | 90% | 3133 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,506 psi | 87% | 3100 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,434 psi | 87% | 3081 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,825 psi | 87% | 3087 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,826 psi | 89% | 3140 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,144 psi | 88% | 3156 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,492 psi | 89% | 3110 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,348 psi | 90% | 3133 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,723 psi | 86% | 2982 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,796 psi | 87% | 2982 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,535 psi | 87% | 3051 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 3186 fps | 97.5% |
| Somchem S335 | <<locked>> | 82% | 54,462 psi | 85% | 2976 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,246 psi | 88% | 3097 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,404 psi | 85% | 3087 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,592 psi | 86% | 3169 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 3166 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 82% | 55,303 psi | 87% | 2963 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,607 psi | 86% | 3009 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,274 psi | 87% | 3025 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,767 psi | 87% | 3061 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,128 psi | 85% | 3104 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,371 psi | 77% | 3015 fps | 96.5% |
| Vihtavuori N540 | <<locked>> | 86% | 56,985 psi | 89% | 3071 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,014 psi | 89% | 3166 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,461 psi | 84% | 3163 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,201 psi | 85% | 3074 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,709 psi | 87% | 3179 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,134 psi | 68% | 3120 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,624 psi | 90% | 3143 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,867 psi | 84% | 3100 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% | 48,269 psi | 76% | 2913 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,963 psi | 74% | 2904 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 38,159 psi | 60% | 2799 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 45,759 psi | 72% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,490 psi | 54% | 2733 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 51,750 psi | 81% | 3048 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,874 psi | 69% | 2884 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 47,630 psi | 75% | 3031 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,882 psi | 84% | 3051 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,356 psi | 76% | 3107 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,019 psi | 69% | 2907 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,210 psi | 74% | 2982 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,142 psi | 54% | 2749 fps | 96% |
| Alliant Reloder-17 | 67.4 gr | 80% | 38,609 psi | 61% | 2887 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,007 psi | 74% | 3018 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 47,384 psi | 74% | 3071 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 86% | 30,023 psi | 47% | 2651 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,506 psi | 57% | 2838 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 88% | 35,041 psi | 55% | 2848 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,677 psi | 81% | 3061 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 44,179 psi | 69% | 2917 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 47,384 psi | 74% | 3071 fps | 95.5% |
| Bofors RP7 | <<locked>> | 84% | 44,570 psi | 70% | 2894 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,751 psi | 84% | 3081 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,744 psi | 70% | 2923 fps | 98.3% |
| Hodgdon H414 | 69.3 gr | 84% | 42,351 psi | 66% | 2920 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 45,513 psi | 71% | 2946 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 52,301 psi | 82% | 3061 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,575 psi | 49% | 2638 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,037 psi | 77% | 3038 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 44,788 psi | 70% | 3002 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 42% | 1759 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,125 psi | 79% | 3009 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,692 psi | 83% | 3045 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,137 psi | 72% | 2923 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,501 psi | 76% | 2949 fps | 97.2% |
| IMR 4350 | <<locked>> | 86% | 42,395 psi | 66% | 2864 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 82% | 43,294 psi | 68% | 2867 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 33,417 psi | 52% | 2690 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 48,443 psi | 76% | 3015 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,070 psi | 85% | 3084 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 53,882 psi | 84% | 3051 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,634 psi | 81% | 3018 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,792 psi | 80% | 2972 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 46,093 psi | 72% | 2920 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,971 psi | 60% | 2749 fps | 95.7% |
| Lovex S070 | <<locked>> | 84% | 41,278 psi | 65% | 2841 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 39,204 psi | 61% | 2822 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 50,415 psi | 79% | 2989 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,010 psi | 80% | 2992 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,586 psi | 73% | 2969 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 48,559 psi | 76% | 3028 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 43,540 psi | 68% | 3025 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,679 psi | 54% | 2736 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 46,891 psi | 73% | 2989 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 38,653 psi | 61% | 2844 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,253 psi | 43% | 1798 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,991 psi | 71% | 2907 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,981 psi | 80% | 3110 fps | 99.8% |
| ReloadSwiss RS 60 | 67.4 gr | 80% | 41,118 psi | 64% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,418 psi | 54% | 2749 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 36,274 psi | 57% | 2822 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 47,979 psi | 75% | 2940 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,481 psi | 65% | 2854 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 96% | 52,823 psi | 83% | 3071 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 94% | 46,108 psi | 72% | 3002 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 44,570 psi | 70% | 2894 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,971 psi | 60% | 2749 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,634 psi | 81% | 3018 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,093 psi | 72% | 2920 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 41,278 psi | 65% | 2841 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,859 psi | 67% | 2913 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,736 psi | 83% | 3048 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,314 psi | 79% | 3015 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,430 psi | 81% | 2930 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,294 psi | 68% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 42,409 psi | 66% | 2805 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,672 psi | 72% | 2995 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 51,140 psi | 80% | 2927 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,547 psi | 82% | 3038 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,989 psi | 66% | 2858 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 31,024 psi | 49% | 2680 fps | 98% |
| Somchem S385 | <<locked>> | 92% | 43,555 psi | 68% | 2917 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,996 psi | 81% | 2917 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,095 psi | 75% | 2907 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,530 psi | 76% | 2920 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,089 psi | 63% | 2785 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 36,085 psi | 57% | 2743 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 98% | 46,137 psi | 72% | 2956 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 46,833 psi | 73% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,549 psi | 56% | 2736 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 84% | 30,864 psi | 48% | 2667 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,534 psi | 56% | 2713 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 42,351 psi | 66% | 2920 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,355 psi | 44% | 2674 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,256 psi | 79% | 3022 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,543 psi | 73% | 2966 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 97 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Peregrine Glider (Glider GRM). Alliant Reloder-26 delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 1,965 fps to 3,287 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 56–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-19, Alliant Reloder-22 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-17, ReloadSwiss RS 60, Hodgdon H414 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Peregrine Glider (Glider GRM) 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.