Load Specifications
Load data in caliber .300 H&H Mag. with .308 | 150gr | Sellier & Bellot SPCE bullet and 96 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 Ramshot Hunter.
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>> | 86% | 55,970 psi | 90% | 2979 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,288 psi | 87% | 2976 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,021 psi | 75% | 2936 fps | 97.2% |
| Accurate 4064 | <<locked>> | 88% | 56,028 psi | 90% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 52,939 psi | 85% | 3068 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 84% | 55,709 psi | 89% | 3061 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,374 psi | 86% | 3009 fps | 99.7% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,404 psi | 87% | 3100 fps | 96% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,418 psi | 87% | 3005 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,970 psi | 90% | 2982 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,825 psi | 90% | 3189 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,215 psi | 87% | 3094 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,824 psi | 86% | 3031 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,273 psi | 87% | 3054 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,795 psi | 86% | 3130 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,027 psi | 88% | 3163 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,403 psi | 86% | 3084 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,280 psi | 71% | 2959 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,314 psi | 81% | 3146 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,680 psi | 89% | 3074 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 54,404 psi | 87% | 3048 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,215 psi | 87% | 3015 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,898 psi | 90% | 2989 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,331 psi | 87% | 3035 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,332 psi | 89% | 3061 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 55,492 psi | 89% | 3120 fps | 98% |
| Hodgdon H4350 | <<locked>> | 92% | 55,521 psi | 89% | 3077 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 84% | 56,318 psi | 90% | 3074 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,954 psi | 87% | 3051 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,333 psi | 90% | 3107 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,927 psi | 90% | 3156 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,897 psi | 58% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,983 psi | 87% | 3018 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,113 psi | 85% | 3002 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,231 psi | 90% | 3045 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,898 psi | 90% | 3022 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 54,839 psi | 88% | 3045 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,144 psi | 90% | 3054 fps | 97.9% |
| IMR 4831 | <<locked>> | 96% | 53,417 psi | 86% | 3058 fps | 99.5% |
| IMR 4895 | <<locked>> | 86% | 55,637 psi | 89% | 3087 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,418 psi | 87% | 3005 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,941 psi | 90% | 3035 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,781 psi | 88% | 2982 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 56,376 psi | 90% | 3041 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,883 psi | 90% | 3048 fps | 99% |
| Lovex S070 | <<locked>> | 94% | 53,476 psi | 86% | 3025 fps | 97.8% |
| Norma 201 | <<locked>> | 84% | 54,578 psi | 88% | 3005 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,114 psi | 88% | 3005 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,505 psi | 86% | 3041 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 55,564 psi | 89% | 3097 fps | 96.2% |
| Norma MRPᴾ | <<locked>> | 100% | 49,777 psi | 80% | 3097 fps | 96.8% |
| Norma URP | <<locked>> | 96% | 55,405 psi | 89% | 3110 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 54,070 psi | 87% | 3064 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 54,041 psi | 87% | 3100 fps | 98.5% |
| Ramshot TAC | <<locked>> | 82% | 54,824 psi | 88% | 3025 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,694 psi | 88% | 3045 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,492 psi | 59% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,201 psi | 89% | 3038 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,810 psi | 88% | 3123 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,737 psi | 88% | 3163 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,347 psi | 90% | 3146 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,288 psi | 89% | 3173 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 55,288 psi | 89% | 2986 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,071 psi | 88% | 3005 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,520 psi | 87% | 3041 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,272 psi | 84% | 3064 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 92% | 54,215 psi | 87% | 3015 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,883 psi | 90% | 3048 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,941 psi | 90% | 3035 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,376 psi | 90% | 3041 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,476 psi | 86% | 3025 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,275 psi | 90% | 3104 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,316 psi | 85% | 2999 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,143 psi | 87% | 3028 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,477 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,188 psi | 90% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,869 psi | 90% | 2995 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 55,259 psi | 89% | 2936 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,953 psi | 85% | 2992 fps | 99.8% |
| Somchem S355 | <<locked>> | 90% | 54,708 psi | 88% | 3038 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,824 psi | 86% | 3110 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,171 psi | 85% | 3045 fps | 97% |
| Vihtavuori N133 | <<locked>> | 84% | 55,854 psi | 90% | 2923 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,969 psi | 88% | 2966 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,709 psi | 89% | 2982 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,188 psi | 90% | 3018 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,157 psi | 87% | 3051 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 54,998 psi | 88% | 3009 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,766 psi | 86% | 2972 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,301 psi | 85% | 3051 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,211 psi | 79% | 3045 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,969 psi | 87% | 3022 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,201 psi | 89% | 3054 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,492 psi | 89% | 3120 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,842 psi | 64% | 2979 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,288 psi | 87% | 3038 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% | 46,079 psi | 74% | 2828 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 47,776 psi | 77% | 2858 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 40,799 psi | 65% | 2808 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 43,569 psi | 70% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 34,722 psi | 56% | 2694 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 49,153 psi | 79% | 2946 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 41,655 psi | 67% | 2782 fps | 98% |
| ADI AR 2209 | <<locked>> | 98% | 50,894 psi | 82% | 3035 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,256 psi | 82% | 2953 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,214 psi | 84% | 2930 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,237 psi | 73% | 2989 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,749 psi | 81% | 3031 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,727 psi | 67% | 2808 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,788 psi | 72% | 2881 fps | 98.7% |
| Alliant Reloder-16 | 58.8 gr | 82% | 34,577 psi | 55% | 2707 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,245 psi | 58% | 2776 fps | 97.8% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,038 psi | 80% | 3022 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,211 psi | 48% | 2602 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 92% | 37,695 psi | 60% | 2867 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,588 psi | 78% | 2949 fps | 99% |
| Bofors RP3 | <<locked>> | 80% | 41,713 psi | 67% | 2815 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 47,834 psi | 77% | 2900 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,721 psi | 85% | 2940 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,676 psi | 81% | 2979 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,279 psi | 68% | 2818 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 45,252 psi | 73% | 2930 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 48,776 psi | 78% | 2953 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 49,705 psi | 80% | 2959 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,791 psi | 48% | 2539 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,977 psi | 74% | 2930 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 88% | 45,020 psi | 72% | 2949 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 43% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,572 psi | 76% | 2907 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 49,806 psi | 80% | 2949 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,758 psi | 70% | 2822 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,151 psi | 74% | 2844 fps | 95.9% |
| IMR 4350 | <<locked>> | 90% | 45,556 psi | 73% | 2874 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,859 psi | 70% | 2822 fps | 95.1% |
| IMR 4831 | <<locked>> | 84% | 35,969 psi | 58% | 2707 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 45,934 psi | 74% | 2913 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 51,256 psi | 82% | 2953 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,762 psi | 78% | 2923 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,675 psi | 78% | 2877 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 44,005 psi | 71% | 2825 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 38,479 psi | 62% | 2707 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 44,237 psi | 71% | 2851 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 48,109 psi | 77% | 2897 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 48,544 psi | 78% | 2900 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,164 psi | 71% | 2867 fps | 99% |
| Norma 204 | <<locked>> | 94% | 51,938 psi | 83% | 3035 fps | 95.3% |
| Norma MRP | <<locked>> | 98% | 46,296 psi | 74% | 3025 fps | 95.8% |
| Norma URP | <<locked>> | 82% | 34,925 psi | 56% | 2694 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 44,005 psi | 71% | 2881 fps | 98.9% |
| Ramshot Hunter | 66.9 gr | 88% | 41,524 psi | 67% | 2858 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 51,271 psi | 82% | 2963 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,068 psi | 82% | 2986 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 43% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,540 psi | 68% | 2802 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,805 psi | 77% | 2999 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,551 psi | 62% | 2848 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 37,086 psi | 59% | 2772 fps | 95.8% |
| ReloadSwiss RS 70 | 67.4 gr | 86% | 39,189 psi | 63% | 2841 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 52,054 psi | 83% | 2936 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,672 psi | 73% | 2841 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 39,189 psi | 63% | 2753 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 48,994 psi | 79% | 3002 fps | 95% |
| Rottweil R 907 | <<locked>> | 88% | 47,834 psi | 77% | 2900 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,479 psi | 62% | 2707 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,762 psi | 78% | 2923 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,005 psi | 71% | 2825 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 44,237 psi | 71% | 2851 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,292 psi | 65% | 2808 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,719 psi | 80% | 2940 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,630 psi | 76% | 2913 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,182 psi | 79% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,263 psi | 66% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,076 psi | 69% | 2762 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 48,849 psi | 78% | 2838 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,414 psi | 79% | 2933 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 39,871 psi | 64% | 2759 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 29,240 psi | 47% | 2579 fps | 96.5% |
| Somchem S385 | <<locked>> | 96% | 46,499 psi | 75% | 2923 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 49,617 psi | 80% | 2828 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,629 psi | 73% | 2822 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,934 psi | 74% | 2828 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,956 psi | 61% | 2690 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 36,274 psi | 58% | 2697 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 51,474 psi | 83% | 2949 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,353 psi | 71% | 2815 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,795 psi | 57% | 2694 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 33,011 psi | 53% | 2687 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,547 psi | 54% | 2608 fps | 97.1% |
| Winchester 748 | <<locked>> | 80% | 51,692 psi | 83% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,469 psi | 73% | 2933 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,545 psi | 49% | 2694 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,456 psi | 76% | 2920 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 96 powders for .300 H&H Mag. loaded with the .308 | 150gr | Sellier & Bellot SPCE. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,189 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,189 fps. Accurate 3100 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 58–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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, Ramshot Hunter rank at the top here: for .300 H&H Mag. with the .308 | 150gr | Sellier & Bellot SPCE 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.