Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 140gr | Barnes RRLP bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 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.
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>> | 84% | 54,172 psi | 85% | 3094 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,043 psi | 88% | 3146 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,081 psi | 77% | 3100 fps | 97.6% |
| Accurate 4064 | <<locked>> | 86% | 54,520 psi | 85% | 3150 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,998 psi | 86% | 3238 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 57,363 psi | 90% | 3232 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,998 psi | 86% | 3176 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,449 psi | 88% | 3274 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,840 psi | 88% | 3169 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,580 psi | 90% | 3146 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,751 psi | 84% | 3297 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,506 psi | 87% | 3199 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,912 psi | 88% | 3225 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,767 psi | 87% | 3304 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,290 psi | 90% | 3337 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 3258 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,209 psi | 72% | 3130 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,837 psi | 83% | 3327 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,493 psi | 90% | 3245 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 56,318 psi | 88% | 3219 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,970 psi | 88% | 3186 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,217 psi | 90% | 3153 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,883 psi | 88% | 3202 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,014 psi | 89% | 3232 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 57,377 psi | 90% | 3291 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 57,435 psi | 90% | 3251 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 82% | 54,259 psi | 85% | 3182 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,898 psi | 88% | 3219 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,505 psi | 85% | 3219 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,012 psi | 85% | 3261 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 56% | 2028 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,376 psi | 87% | 3186 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,636 psi | 86% | 3166 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,331 psi | 85% | 3156 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,319 psi | 90% | 3189 fps | 98.2% |
| IMR 4350 | <<locked>> | 96% | 56,826 psi | 89% | 3219 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,725 psi | 90% | 3222 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 55,492 psi | 87% | 3228 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 57,377 psi | 90% | 3258 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,840 psi | 88% | 3169 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,725 psi | 90% | 3205 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,144 psi | 88% | 3150 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,520 psi | 85% | 3153 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,450 psi | 90% | 3215 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 55,376 psi | 87% | 3199 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 55,999 psi | 88% | 3173 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,739 psi | 89% | 3173 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,201 psi | 87% | 3209 fps | 100% |
| Norma MRPᴾ | <<locked>> | 100% | 51,967 psi | 81% | 3274 fps | 97.3% |
| Norma URP | <<locked>> | 96% | 57,290 psi | 90% | 3281 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 56,057 psi | 88% | 3235 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,260 psi | 88% | 3274 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 56,275 psi | 88% | 3192 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,362 psi | 88% | 3212 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,564 psi | 57% | 2073 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,029 psi | 89% | 3209 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,594 psi | 89% | 3294 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,724 psi | 89% | 3333 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,853 psi | 86% | 3261 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,580 psi | 90% | 3353 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 56,826 psi | 89% | 3153 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,637 psi | 89% | 3169 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,434 psi | 88% | 3212 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,491 psi | 85% | 3241 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 92% | 55,970 psi | 88% | 3186 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,450 psi | 90% | 3215 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,725 psi | 90% | 3205 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,520 psi | 85% | 3153 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,376 psi | 87% | 3199 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,491 psi | 85% | 3215 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,911 psi | 86% | 3166 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,695 psi | 87% | 3192 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,985 psi | 89% | 3104 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,667 psi | 90% | 3097 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,566 psi | 90% | 3159 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3232 fps | 96.3% |
| Somchem S335 | <<locked>> | 84% | 56,623 psi | 89% | 3097 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,766 psi | 86% | 3159 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 56,347 psi | 88% | 3209 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,391 psi | 88% | 3287 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,347 psi | 87% | 3219 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 84% | 57,377 psi | 90% | 3084 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,666 psi | 89% | 3130 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,246 psi | 90% | 3146 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,346 psi | 85% | 3127 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,115 psi | 88% | 3222 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 56,565 psi | 89% | 3176 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,608 psi | 87% | 3140 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,172 psi | 86% | 3222 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 3215 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,014 psi | 88% | 3189 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,014 psi | 89% | 3225 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,595 psi | 90% | 3294 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,597 psi | 65% | 3156 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,912 psi | 88% | 3205 fps | 100% |
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% | 47,384 psi | 74% | 2986 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,994 psi | 77% | 3018 fps | 95.7% |
| Accurate 3100 | <<locked>> | 94% | 39,842 psi | 62% | 2910 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 44,817 psi | 70% | 2979 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 36,027 psi | 56% | 2844 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 50,343 psi | 79% | 3110 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 42,917 psi | 67% | 2943 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 52,808 psi | 83% | 3209 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,446 psi | 82% | 3117 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,766 psi | 84% | 3094 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,659 psi | 73% | 3156 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,004 psi | 67% | 2969 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,948 psi | 72% | 3041 fps | 98.9% |
| Alliant Reloder-16 | 64.1 gr | 82% | 35,534 psi | 56% | 2861 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,565 psi | 59% | 2940 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,938 psi | 81% | 3196 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 31,285 psi | 49% | 2753 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 36,622 psi | 57% | 2959 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,125 psi | 79% | 3117 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 43,033 psi | 67% | 2976 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 46,354 psi | 73% | 3005 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,969 psi | 85% | 3100 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,228 psi | 82% | 3140 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,584 psi | 68% | 2976 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 43,990 psi | 69% | 3031 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 88% | 50,401 psi | 79% | 3123 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 50,923 psi | 80% | 3123 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,763 psi | 48% | 2684 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,427 psi | 74% | 3094 fps | 99.8% |
| Hodgdon Superformance | 78.3 gr | 88% | 46,601 psi | 73% | 3114 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,745 psi | 42% | 1811 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,733 psi | 76% | 3064 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 51,300 psi | 80% | 3114 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,078 psi | 71% | 2982 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,485 psi | 74% | 3005 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 46,992 psi | 74% | 3035 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,933 psi | 70% | 2979 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 34,824 psi | 55% | 2799 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 47,137 psi | 74% | 3074 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 52,446 psi | 82% | 3117 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,401 psi | 79% | 3087 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,734 psi | 78% | 3038 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 45,136 psi | 71% | 2986 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 39,624 psi | 62% | 2861 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 42,917 psi | 67% | 2953 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 49,255 psi | 77% | 3054 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,908 psi | 78% | 3061 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,324 psi | 71% | 3025 fps | 99.2% |
| Norma MRP | <<locked>> | 96% | 45,092 psi | 71% | 3133 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 36,056 psi | 56% | 2844 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 45,426 psi | 71% | 3045 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 40,176 psi | 63% | 2953 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 52,692 psi | 83% | 3130 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,504 psi | 82% | 3150 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,296 psi | 43% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,816 psi | 69% | 2959 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,269 psi | 77% | 3163 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,987 psi | 63% | 3015 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,882 psi | 56% | 2861 fps | 95.2% |
| ReloadSwiss RS 70 | 71.8 gr | 84% | 37,811 psi | 59% | 2930 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 53,345 psi | 84% | 3097 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,891 psi | 73% | 3002 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 40,466 psi | 63% | 2910 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 50,923 psi | 80% | 3176 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 86% | 46,354 psi | 73% | 3005 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 39,624 psi | 62% | 2861 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,401 psi | 79% | 3087 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,136 psi | 71% | 2986 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 42,917 psi | 67% | 2953 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,553 psi | 65% | 2966 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,271 psi | 80% | 3104 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,892 psi | 77% | 3074 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,183 psi | 79% | 2995 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,192 psi | 66% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,411 psi | 70% | 2920 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 50,444 psi | 79% | 3169 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 49,980 psi | 78% | 2992 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,966 psi | 80% | 3097 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 40,973 psi | 64% | 2913 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 30,327 psi | 48% | 2730 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 48,341 psi | 76% | 3087 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 50,647 psi | 79% | 2982 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,804 psi | 73% | 2976 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,224 psi | 74% | 2986 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,073 psi | 61% | 2841 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 35,056 psi | 55% | 2785 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 52,794 psi | 83% | 3114 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,658 psi | 72% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 37,144 psi | 58% | 2848 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 34,447 psi | 54% | 2844 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,606 psi | 54% | 2759 fps | 97.4% |
| Winchester 748 | <<locked>> | 80% | 53,200 psi | 83% | 3163 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,990 psi | 69% | 3031 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,675 psi | 47% | 2776 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,791 psi | 76% | 3081 fps | 99.8% |
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 115 powders for .300 Weath. Mag. loaded with the .308 | 140gr | Barnes RRLP. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,353 fps; across all powders the maximum-charge window runs from 2,028 fps to 3,353 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 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 140.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .308 | 140gr | Barnes RRLP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.