Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 155gr | Atomic 29 HP bullet and 97 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-26 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% | 57,537 psi | 90% | 3005 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,811 psi | 87% | 3028 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,374 psi | 84% | 3058 fps | 99.2% |
| Accurate 4064 | <<locked>> | 84% | 54,360 psi | 85% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,550 psi | 87% | 3120 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,305 psi | 90% | 3100 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,129 psi | 86% | 3051 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,014 psi | 89% | 3169 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 3153 fps | 96.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,288 psi | 85% | 3173 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,782 psi | 87% | 3071 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,956 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,449 psi | 88% | 3182 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,215 psi | 85% | 3150 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,173 psi | 88% | 3153 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 3146 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,415 psi | 79% | 3081 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,743 psi | 69% | 2989 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,157 psi | 85% | 3222 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,377 psi | 90% | 3117 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,936 psi | 77% | 3061 fps | 96.3% |
| Bofors RP3 | <<locked>> | 86% | 56,565 psi | 89% | 3087 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 3146 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 55,941 psi | 88% | 3071 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 56,942 psi | 89% | 3107 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,331 psi | 85% | 3117 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 88% | 54,041 psi | 85% | 3074 fps | 97.7% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,348 psi | 90% | 3140 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,811 psi | 89% | 3100 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,592 psi | 86% | 3087 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,766 psi | 86% | 3153 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 57% | 1942 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,347 psi | 87% | 3054 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,447 psi | 85% | 3031 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,217 psi | 90% | 3068 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 57,116 psi | 90% | 3104 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,317 psi | 85% | 3045 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 56,231 psi | 88% | 3114 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,450 psi | 90% | 3127 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,376 psi | 88% | 3087 fps | 96.1% |
| Lovex D073.6 | <<locked>> | 82% | 57,696 psi | 90% | 3068 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,883 psi | 88% | 3018 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,433 psi | 85% | 3022 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,740 psi | 90% | 3094 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 55,550 psi | 87% | 3081 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,092 psi | 69% | 2890 fps | 97.7% |
| Norma 201 | <<locked>> | 82% | 55,724 psi | 87% | 3035 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,637 psi | 89% | 3035 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,245 psi | 87% | 3081 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,462 psi | 85% | 3097 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3241 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 54,389 psi | 85% | 3104 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 56,333 psi | 88% | 3107 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,344 psi | 82% | 3136 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 94% | 57,116 psi | 90% | 3166 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,644 psi | 73% | 2995 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 58% | 1985 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,971 psi | 89% | 3087 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,043 psi | 89% | 3166 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,682 psi | 90% | 3205 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,666 psi | 87% | 3143 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,244 psi | 85% | 3173 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,318 psi | 88% | 3035 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,652 psi | 89% | 3084 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,998 psi | 86% | 3074 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 98% | 55,332 psi | 87% | 3133 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 55,941 psi | 88% | 3071 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,740 psi | 90% | 3094 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,696 psi | 90% | 3068 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,433 psi | 85% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,550 psi | 87% | 3081 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,781 psi | 86% | 3091 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,651 psi | 87% | 3064 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,550 psi | 89% | 2966 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,624 psi | 90% | 2966 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,624 psi | 90% | 3048 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,853 psi | 86% | 3127 fps | 97.7% |
| Somchem S335 | <<locked>> | 82% | 56,260 psi | 88% | 2959 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,550 psi | 89% | 3081 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,913 psi | 89% | 3068 fps | 95.9% |
| Somchem S365 | <<locked>> | 96% | 57,638 psi | 90% | 3166 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,028 psi | 88% | 3110 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 57,159 psi | 90% | 2946 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,913 psi | 89% | 2995 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,174 psi | 90% | 3012 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,505 psi | 85% | 3002 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,579 psi | 89% | 3100 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,634 psi | 81% | 3018 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 55,477 psi | 87% | 3005 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,782 psi | 87% | 3107 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,420 psi | 88% | 3166 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 3228 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,478 psi | 89% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,549 psi | 85% | 3120 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,455 psi | 71% | 3130 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,970 psi | 88% | 3074 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 3104 fps | 97.7% |
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% | 50,357 psi | 79% | 2900 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,791 psi | 76% | 2907 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 37,579 psi | 59% | 2749 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 47,718 psi | 75% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,245 psi | 57% | 2740 fps | 97% |
| ADI AR 2206H | <<locked>> | 80% | 53,606 psi | 84% | 3041 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,513 psi | 71% | 2877 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 46,543 psi | 73% | 2976 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 98% | 51,010 psi | 80% | 3087 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,560 psi | 79% | 3107 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,977 psi | 72% | 2904 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,066 psi | 77% | 2976 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,621 psi | 56% | 2756 fps | 97.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,509 psi | 63% | 2894 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,050 psi | 72% | 2963 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,456 psi | 73% | 3015 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,601 psi | 43% | 2536 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,853 psi | 56% | 2792 fps | 95.6% |
| Alliant Reloder-26 | 75.5 gr | 86% | 34,374 psi | 54% | 2792 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,693 psi | 84% | 3058 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 45,600 psi | 71% | 2992 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,035 psi | 72% | 2913 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,456 psi | 73% | 3015 fps | 95.8% |
| Bofors RP7 | <<locked>> | 82% | 43,294 psi | 68% | 2831 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 46,499 psi | 73% | 2920 fps | 99% |
| Hodgdon H414 | <<locked>> | 82% | 41,292 psi | 65% | 2861 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 82% | 44,454 psi | 70% | 2887 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,592 psi | 84% | 3077 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,112 psi | 52% | 2644 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,952 psi | 80% | 3028 fps | 100% |
| Hodgdon Superformance | 74.2 gr | 82% | 40,422 psi | 63% | 2867 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,963 psi | 42% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,895 psi | 81% | 2999 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,863 psi | 75% | 2917 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,299 psi | 79% | 2949 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 41,437 psi | 65% | 2808 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,076 psi | 66% | 2805 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 34,998 psi | 55% | 2694 fps | 96.7% |
| IMR 4895 | <<locked>> | 80% | 50,328 psi | 79% | 3009 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,953 psi | 83% | 3028 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 80% | 53,882 psi | 84% | 3012 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,518 psi | 82% | 2963 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,877 psi | 75% | 2913 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,494 psi | 62% | 2749 fps | 96.7% |
| Lovex S070 | <<locked>> | 82% | 40,190 psi | 63% | 2782 fps | 95.7% |
| Lovex S071 | <<locked>> | 94% | 36,143 psi | 57% | 2713 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 52,243 psi | 82% | 2979 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,156 psi | 83% | 2982 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,414 psi | 76% | 2963 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,355 psi | 74% | 2969 fps | 95.6% |
| Norma MRP | <<locked>> | 90% | 39,798 psi | 62% | 2900 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,303 psi | 57% | 2740 fps | 96.9% |
| Ramshot Big Game | <<locked>> | 80% | 48,950 psi | 77% | 2986 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 48,602 psi | 76% | 3064 fps | 95% |
| Ramshot Hunter | <<locked>> | 82% | 37,753 psi | 59% | 2782 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 43,294 psi | 68% | 2927 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,354 psi | 43% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,601 psi | 73% | 2904 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,142 psi | 83% | 3104 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,120 psi | 68% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,143 psi | 57% | 2756 fps | 96.6% |
| ReloadSwiss RS 70 | 69.6 gr | 80% | 35,360 psi | 55% | 2762 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 49,748 psi | 78% | 2930 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,294 psi | 68% | 2851 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 51,547 psi | 81% | 3015 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 92% | 45,020 psi | 71% | 2943 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 82% | 43,294 psi | 68% | 2831 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,494 psi | 62% | 2749 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,882 psi | 84% | 3012 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,877 psi | 75% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,190 psi | 63% | 2782 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,599 psi | 70% | 2907 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,069 psi | 82% | 3005 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,214 psi | 83% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,904 psi | 70% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,725 psi | 61% | 2690 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,614 psi | 70% | 2936 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 52,881 psi | 83% | 2910 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,700 psi | 68% | 2854 fps | 99.7% |
| Somchem S361 | <<locked>> | 94% | 53,229 psi | 83% | 3005 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 32,764 psi | 51% | 2690 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 42,786 psi | 67% | 2864 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 53,824 psi | 84% | 2900 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,067 psi | 78% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,314 psi | 79% | 2907 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,756 psi | 65% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,724 psi | 59% | 2743 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 94% | 42,264 psi | 66% | 2838 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 48,559 psi | 76% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,130 psi | 58% | 2740 fps | 97% |
| Vihtavuori N555 | <<locked>> | 82% | 30,342 psi | 48% | 2615 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 98% | 53,388 psi | 84% | 3159 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,057 psi | 58% | 2713 fps | 99.1% |
| Winchester 760 | <<locked>> | 82% | 41,481 psi | 65% | 2864 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,833 psi | 44% | 2625 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,315 psi | 82% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,498 psi | 71% | 2910 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 107 powders for .300 Weath. Mag. loaded with the .308 | 155gr | Atomic 29 HP. Norma MRP delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,241 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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-26, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .308 | 155gr | Atomic 29 HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, 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.