Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-16.
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 2015 | <<locked>> | 82% | 56,130 psi | 90% | 2946 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,680 psi | 89% | 2976 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,114 psi | 87% | 2972 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,601 psi | 75% | 2923 fps | 97.1% |
| Accurate 4064 | <<locked>> | 88% | 55,753 psi | 89% | 3025 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,999 psi | 90% | 3114 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 55,477 psi | 89% | 3054 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,113 psi | 85% | 2999 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,172 psi | 87% | 2999 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,347 psi | 89% | 2976 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,376 psi | 89% | 3179 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,838 psi | 86% | 3084 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,359 psi | 86% | 3025 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,751 psi | 86% | 3045 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,330 psi | 86% | 3117 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,563 psi | 87% | 3153 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 3074 fps | 95.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,903 psi | 70% | 2953 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,734 psi | 80% | 3136 fps | 99.1% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,245 psi | 89% | 3068 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 54,128 psi | 87% | 3041 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,027 psi | 87% | 3009 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,637 psi | 89% | 2982 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,809 psi | 86% | 3028 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,882 psi | 88% | 3051 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 94% | 55,042 psi | 88% | 3110 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 92% | 55,056 psi | 88% | 3068 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 84% | 56,043 psi | 90% | 3064 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,461 psi | 86% | 3045 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,825 psi | 90% | 3097 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,361 psi | 89% | 3143 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,810 psi | 57% | 1906 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,679 psi | 86% | 3012 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,289 psi | 90% | 3048 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,956 psi | 90% | 3038 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,463 psi | 89% | 3012 fps | 97.8% |
| IMR 4350 | <<locked>> | 96% | 54,418 psi | 87% | 3035 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,680 psi | 89% | 3045 fps | 97.8% |
| IMR 4831 | <<locked>> | 96% | 52,953 psi | 85% | 3048 fps | 99.5% |
| IMR 4895 | <<locked>> | 86% | 55,129 psi | 88% | 3077 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,172 psi | 87% | 2999 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,434 psi | 89% | 3028 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,549 psi | 87% | 2976 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 55,840 psi | 90% | 3031 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,492 psi | 89% | 3038 fps | 98.9% |
| Lovex S070 | <<locked>> | 94% | 53,084 psi | 85% | 3018 fps | 97.7% |
| Norma 201 | <<locked>> | 84% | 54,056 psi | 87% | 2995 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,795 psi | 88% | 2999 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,011 psi | 85% | 3031 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 55,172 psi | 88% | 3087 fps | 96% |
| Norma MRPᴾ | <<locked>> | 100% | 49,197 psi | 79% | 3084 fps | 96.6% |
| Norma URP | <<locked>> | 96% | 54,926 psi | 88% | 3100 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 86% | 53,606 psi | 86% | 3054 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 53,635 psi | 86% | 3094 fps | 98.4% |
| Ramshot TAC | <<locked>> | 82% | 54,404 psi | 87% | 3015 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,215 psi | 87% | 3035 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,419 psi | 58% | 1952 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,042 psi | 88% | 3035 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,505 psi | 87% | 3114 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,273 psi | 87% | 3153 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,912 psi | 90% | 3136 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,897 psi | 88% | 3166 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 54,969 psi | 88% | 2979 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,795 psi | 88% | 2999 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,998 psi | 87% | 3031 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 54,027 psi | 87% | 3009 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,492 psi | 89% | 3038 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,434 psi | 89% | 3028 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,840 psi | 90% | 3031 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,084 psi | 85% | 3018 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,796 psi | 89% | 3097 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,055 psi | 85% | 2995 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,911 psi | 86% | 3022 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,187 psi | 88% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,941 psi | 90% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,492 psi | 89% | 2986 fps | 97.9% |
| Somchem S335 | <<locked>> | 84% | 54,781 psi | 88% | 2930 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,231 psi | 90% | 3041 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,230 psi | 87% | 3031 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,316 psi | 85% | 3104 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,562 psi | 84% | 3031 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 84% | 55,564 psi | 89% | 2917 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,665 psi | 88% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,172 psi | 88% | 2972 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,695 psi | 89% | 3009 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,751 psi | 86% | 3041 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 82% | 54,723 psi | 88% | 2999 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,519 psi | 86% | 2969 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,866 psi | 85% | 3045 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,689 psi | 78% | 3031 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,635 psi | 86% | 3015 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,926 psi | 88% | 3051 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,042 psi | 88% | 3110 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,378 psi | 63% | 2966 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,795 psi | 86% | 3028 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 2015 | <<locked>> | 80% | 52,750 psi | 85% | 2897 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,759 psi | 73% | 2822 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 47,326 psi | 76% | 2848 fps | 95.3% |
| Accurate 3100 | <<locked>> | 96% | 40,393 psi | 65% | 2799 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 43,250 psi | 69% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,461 psi | 55% | 2684 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 48,660 psi | 78% | 2936 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 41,379 psi | 66% | 2776 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,763 psi | 81% | 2943 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,837 psi | 83% | 2927 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,991 psi | 72% | 2982 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,372 psi | 81% | 3022 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,452 psi | 66% | 2802 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,295 psi | 71% | 2871 fps | 98.6% |
| Alliant Reloder-16 | 58.3 gr | 82% | 34,185 psi | 55% | 2694 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,027 psi | 58% | 2769 fps | 97.7% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,661 psi | 80% | 3012 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,908 psi | 51% | 2654 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 37,188 psi | 60% | 2851 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,327 psi | 77% | 2946 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 41,437 psi | 66% | 2808 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 47,572 psi | 76% | 2894 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,446 psi | 84% | 2930 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,430 psi | 81% | 2972 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,018 psi | 67% | 2808 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 45,034 psi | 72% | 2923 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 88% | 48,559 psi | 78% | 2949 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 49,197 psi | 79% | 2949 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,573 psi | 47% | 2530 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,484 psi | 73% | 2920 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 47,935 psi | 77% | 3009 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 43% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,282 psi | 76% | 2900 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 49,458 psi | 79% | 2943 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,482 psi | 70% | 2815 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,934 psi | 74% | 2838 fps | 95.8% |
| IMR 4350 | <<locked>> | 92% | 47,964 psi | 77% | 2920 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 46,354 psi | 74% | 2871 fps | 95.8% |
| IMR 4831 | <<locked>> | 84% | 35,708 psi | 57% | 2700 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 45,426 psi | 73% | 2900 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 50,763 psi | 81% | 2943 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,457 psi | 78% | 2917 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,356 psi | 78% | 2871 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 43,700 psi | 70% | 2818 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 40,640 psi | 65% | 2756 fps | 95.8% |
| Lovex S070 | <<locked>> | 88% | 44,034 psi | 71% | 2844 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 47,805 psi | 77% | 2887 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 48,254 psi | 77% | 2894 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,685 psi | 70% | 2854 fps | 98.9% |
| Norma 204 | <<locked>> | 94% | 51,547 psi | 83% | 3022 fps | 95.2% |
| Norma MRP | <<locked>> | 98% | 45,919 psi | 74% | 3018 fps | 95.7% |
| Norma URP | <<locked>> | 82% | 34,664 psi | 56% | 2687 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 43,729 psi | 70% | 2874 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 41,133 psi | 66% | 2848 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 50,850 psi | 82% | 2956 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,604 psi | 81% | 2972 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 44% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,308 psi | 68% | 2792 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,224 psi | 76% | 2986 fps | 99% |
| ReloadSwiss RS 60 | 61.3 gr | 80% | 38,305 psi | 61% | 2841 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 36,666 psi | 59% | 2759 fps | 95.6% |
| ReloadSwiss RS 70 | 66.9 gr | 86% | 38,827 psi | 62% | 2828 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 51,750 psi | 83% | 2927 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,382 psi | 73% | 2835 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 38,914 psi | 62% | 2749 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 47,572 psi | 76% | 2894 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 40,640 psi | 65% | 2756 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,457 psi | 78% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,700 psi | 70% | 2818 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 44,034 psi | 71% | 2844 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,871 psi | 64% | 2799 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,472 psi | 79% | 2930 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,181 psi | 76% | 2904 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,878 psi | 78% | 2831 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,973 psi | 66% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,873 psi | 69% | 2756 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 48,573 psi | 78% | 2831 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,182 psi | 79% | 2923 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 39,610 psi | 64% | 2753 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 28,993 psi | 46% | 2569 fps | 96.3% |
| Somchem S385 | <<locked>> | 96% | 46,108 psi | 74% | 2913 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 49,298 psi | 79% | 2825 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,339 psi | 73% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,658 psi | 73% | 2822 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,710 psi | 60% | 2684 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 36,027 psi | 58% | 2690 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 51,155 psi | 82% | 2943 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,092 psi | 71% | 2808 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,549 psi | 57% | 2687 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 32,619 psi | 52% | 2677 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,373 psi | 54% | 2602 fps | 97% |
| Winchester 748 | <<locked>> | 80% | 51,401 psi | 82% | 2995 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,034 psi | 72% | 2923 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,255 psi | 49% | 2680 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,007 psi | 75% | 2910 fps | 99.7% |
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 95 powders for .300 H&H Mag. loaded with the .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,179 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,179 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Power Pro Varmint, 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 60, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for .300 H&H Mag. with the .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC 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.