Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 139gr | RWS Evolution Green bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Power Pro 2000-MR.
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 2015 | <<locked>> | 86% | 55,535 psi | 89% | 3038 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,070 psi | 87% | 3058 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,679 psi | 86% | 3051 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,246 psi | 90% | 3127 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 53,577 psi | 86% | 3094 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,824 psi | 86% | 3169 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 88% | 55,027 psi | 88% | 3136 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 94% | 56,130 psi | 90% | 3133 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,056 psi | 87% | 3087 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 54,578 psi | 88% | 3071 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,811 psi | 89% | 3205 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,853 psi | 88% | 3255 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,782 psi | 89% | 3153 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,274 psi | 89% | 3048 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,910 psi | 85% | 3117 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,011 psi | 83% | 3176 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,287 psi | 85% | 3222 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,753 psi | 59% | 2861 fps | 96.4% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,085 psi | 88% | 3146 fps | 99% |
| Bofors RP3 | <<locked>> | 92% | 52,707 psi | 85% | 3110 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,898 psi | 90% | 3074 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,156 psi | 85% | 3110 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,230 psi | 89% | 3215 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 82% | 54,621 psi | 88% | 3087 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,796 psi | 89% | 3114 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,012 psi | 87% | 3123 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 98% | 53,519 psi | 86% | 3166 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 88% | 55,579 psi | 89% | 3150 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,196 psi | 77% | 3045 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,940 psi | 88% | 3179 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 98% | 54,534 psi | 87% | 3202 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,969 psi | 56% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,519 psi | 86% | 3097 fps | 99.7% |
| IMR 3031 | <<locked>> | 88% | 55,129 psi | 88% | 3133 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,608 psi | 89% | 3117 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,666 psi | 89% | 3087 fps | 96.6% |
| IMR 4198 | <<locked>> | 82% | 55,274 psi | 89% | 3005 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,463 psi | 89% | 3114 fps | 96.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,068 psi | 82% | 3104 fps | 98.4% |
| IMR 4895 | <<locked>> | 90% | 54,259 psi | 87% | 3153 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 54,056 psi | 87% | 3087 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 53,838 psi | 86% | 3064 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,418 psi | 87% | 3107 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,650 psi | 88% | 3061 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 55,085 psi | 88% | 3114 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,462 psi | 87% | 3100 fps | 97.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,405 psi | 89% | 3136 fps | 96.9% |
| Norma 201 | <<locked>> | 88% | 53,606 psi | 86% | 3077 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 54,143 psi | 87% | 3087 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,622 psi | 89% | 3163 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 53,200 psi | 85% | 3159 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 90% | 52,852 psi | 85% | 3133 fps | 99.3% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,040 psi | 83% | 3146 fps | 96.9% |
| Ramshot TAC | <<locked>> | 86% | 54,491 psi | 87% | 3097 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,896 psi | 86% | 3120 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,085 psi | 88% | 3087 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,433 psi | 57% | 1985 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,577 psi | 86% | 3071 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,346 psi | 87% | 3100 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,142 psi | 85% | 3186 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,852 psi | 85% | 3222 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,737 psi | 86% | 3192 fps | 98.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,954 psi | 87% | 3222 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 86% | 54,114 psi | 87% | 3061 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,882 psi | 86% | 3074 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 96% | 56,043 psi | 90% | 3156 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,462 psi | 87% | 3100 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,418 psi | 87% | 3107 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,085 psi | 88% | 3114 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,405 psi | 89% | 3136 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,694 psi | 88% | 3169 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,304 psi | 90% | 3074 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,663 psi | 84% | 3068 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,374 psi | 86% | 3100 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,390 psi | 89% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,608 psi | 89% | 3018 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,056 psi | 88% | 3051 fps | 96.5% |
| Somchem S321 | <<locked>> | 84% | 55,303 psi | 89% | 3120 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,665 psi | 88% | 3022 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,217 psi | 90% | 3127 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 53,113 psi | 85% | 3100 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,326 psi | 76% | 3097 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 84% | 55,027 psi | 88% | 2989 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,579 psi | 89% | 3012 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,621 psi | 86% | 3048 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,824 psi | 88% | 3061 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,607 psi | 88% | 3081 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,854 psi | 90% | 3159 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 86% | 54,462 psi | 87% | 3087 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 90% | 53,040 psi | 85% | 3054 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,868 psi | 88% | 3163 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,900 psi | 64% | 2949 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,866 psi | 85% | 3081 fps | 99.8% |
| Winchester 748 | <<locked>> | 86% | 54,505 psi | 87% | 3140 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,780 psi | 86% | 3169 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,185 psi | 85% | 3107 fps | 99.7% |
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 2015 | <<locked>> | 80% | 45,948 psi | 74% | 2884 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,328 psi | 81% | 2999 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,174 psi | 61% | 2779 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,600 psi | 73% | 2949 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 36,114 psi | 58% | 2762 fps | 99.4% |
| Accurate 4350 | <<locked>> | 92% | 40,306 psi | 65% | 2910 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 42,453 psi | 68% | 2897 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,071 psi | 58% | 2730 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,556 psi | 71% | 2913 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 44,425 psi | 71% | 2913 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,098 psi | 84% | 3140 fps | 99.6% |
| Alliant Power Pro 2000-MR | 58.5 gr | 80% | 38,551 psi | 62% | 2907 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,404 psi | 57% | 2749 fps | 96.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,895 psi | 83% | 2995 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,159 psi | 61% | 2815 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 40,393 psi | 65% | 2927 fps | 96% |
| Alliant Reloder-17 | 60.4 gr | 84% | 34,983 psi | 56% | 2818 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 34,548 psi | 55% | 2799 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,771 psi | 67% | 2894 fps | 96.4% |
| Bofors RP3 | <<locked>> | 80% | 34,809 psi | 56% | 2743 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,282 psi | 74% | 2907 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,279 psi | 69% | 2930 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,703 psi | 76% | 3081 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 80% | 51,010 psi | 82% | 3031 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,953 psi | 83% | 3054 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 41,176 psi | 66% | 2874 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 96% | 50,009 psi | 80% | 3100 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 42,815 psi | 69% | 2910 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 34,563 psi | 55% | 2746 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,696 psi | 62% | 2864 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 96% | 50,734 psi | 81% | 3130 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,947 psi | 42% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,147 psi | 66% | 2858 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 42,148 psi | 68% | 2913 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,840 psi | 61% | 2769 fps | 95.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 49,124 psi | 79% | 2972 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 52,156 psi | 84% | 2959 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 48,979 psi | 79% | 2995 fps | 95% |
| IMR 4831 | <<locked>> | 92% | 38,856 psi | 62% | 2861 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 39,088 psi | 63% | 2851 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 80% | 44,556 psi | 71% | 2913 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 50,343 psi | 81% | 3009 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 41,089 psi | 66% | 2871 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 42,699 psi | 68% | 2838 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 37,536 psi | 60% | 2769 fps | 97.7% |
| Lovex S065 | <<locked>> | 92% | 44,918 psi | 72% | 2923 fps | 95.6% |
| Lovex S070 | <<locked>> | 96% | 48,486 psi | 78% | 3012 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 41,394 psi | 66% | 2848 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 41,756 psi | 67% | 2864 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 37,550 psi | 60% | 2805 fps | 96.4% |
| Norma URP | <<locked>> | 92% | 40,538 psi | 65% | 2913 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 37,173 psi | 60% | 2815 fps | 96% |
| Ramshot Hunter | <<locked>> | 96% | 45,542 psi | 73% | 3018 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 44,599 psi | 72% | 2910 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,845 psi | 70% | 2930 fps | 98% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,283 psi | 77% | 2966 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,092 psi | 42% | 1772 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,154 psi | 80% | 3012 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 47,718 psi | 77% | 2979 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,972 psi | 64% | 2927 fps | 96.4% |
| ReloadSwiss RS 60 | 57.6 gr | 80% | 32,605 psi | 52% | 2762 fps | 97.4% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,190 psi | 64% | 2927 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 43,627 psi | 70% | 3012 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 45,005 psi | 72% | 2904 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 39,262 psi | 63% | 2792 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 80% | 32,677 psi | 52% | 2680 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 44,918 psi | 72% | 2923 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,089 psi | 66% | 2871 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 37,536 psi | 60% | 2769 fps | 97.7% |
| Shooters World SW4350 | <<locked>> | 96% | 48,486 psi | 78% | 3012 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,318 psi | 58% | 2799 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,823 psi | 85% | 3022 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,656 psi | 68% | 2877 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,075 psi | 66% | 2861 fps | 97.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,946 psi | 69% | 2812 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,534 psi | 57% | 2661 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 51,358 psi | 82% | 2989 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 48,298 psi | 77% | 3002 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 42,525 psi | 68% | 2815 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,511 psi | 68% | 2881 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 33,678 psi | 54% | 2694 fps | 95.5% |
| Somchem S365 | <<locked>> | 86% | 29,573 psi | 47% | 2664 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 48,646 psi | 78% | 2890 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,265 psi | 69% | 2812 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,667 psi | 62% | 2785 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,552 psi | 63% | 2792 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 31,995 psi | 51% | 2625 fps | 96.5% |
| Vihtavuori N160 | <<locked>> | 90% | 39,740 psi | 64% | 2858 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 44,614 psi | 72% | 2910 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 80% | 38,072 psi | 61% | 2776 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 90% | 39,189 psi | 63% | 2858 fps | 95% |
| Vihtavuori N555 | <<locked>> | 98% | 37,130 psi | 60% | 2881 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,721 psi | 52% | 2651 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 44,005 psi | 71% | 2953 fps | 99.5% |
| Winchester 760 | <<locked>> | 96% | 50,009 psi | 80% | 3100 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,451 psi | 65% | 2861 fps | 97.8% |
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 96 powders for .300 H&H Mag. loaded with the .308 | 139gr | RWS Evolution Green. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,255 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,255 fps. Accurate 4350 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .300 H&H Mag. with the .308 | 139gr | RWS Evolution Green 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.