Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 150gr | Sako Powerhead Blade 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 70, Hodgdon Superformance and Alliant Reloder-17.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 52,228 psi | 86% | 3009 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,563 psi | 90% | 3071 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,050 psi | 77% | 3025 fps | 98% |
| Accurate 4064 | <<locked>> | 86% | 52,388 psi | 86% | 3061 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,113 psi | 87% | 3159 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 52,431 psi | 86% | 3094 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,722 psi | 88% | 3100 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,839 psi | 90% | 3199 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,708 psi | 90% | 3094 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 52,475 psi | 86% | 3222 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,679 psi | 90% | 3196 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,070 psi | 89% | 3123 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,491 psi | 89% | 3146 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,331 psi | 89% | 3228 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 51,851 psi | 85% | 3199 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,780 psi | 88% | 3182 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,556 psi | 73% | 3058 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,928 psi | 64% | 2946 fps | 96.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,981 psi | 84% | 3255 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,431 psi | 86% | 3107 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 54,607 psi | 90% | 3136 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,665 psi | 90% | 3117 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,491 psi | 89% | 3123 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 51,851 psi | 85% | 3094 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 92% | 52,301 psi | 86% | 3156 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 90% | 52,576 psi | 86% | 3117 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 52,997 psi | 87% | 3107 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,433 psi | 89% | 3143 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,011 psi | 87% | 3140 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,518 psi | 86% | 3192 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,795 psi | 59% | 1962 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,186 psi | 89% | 3107 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,287 psi | 87% | 3087 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,055 psi | 87% | 3081 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,779 psi | 87% | 3058 fps | 98.1% |
| IMR 4350 | <<locked>> | 94% | 51,982 psi | 85% | 3087 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,055 psi | 87% | 3091 fps | 98.1% |
| IMR 4831 | <<locked>> | 96% | 53,708 psi | 88% | 3153 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 52,243 psi | 86% | 3120 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,708 psi | 90% | 3094 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,301 psi | 86% | 3064 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,100 psi | 90% | 3074 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,084 psi | 87% | 3077 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 52,620 psi | 86% | 3081 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 53,751 psi | 88% | 3123 fps | 98.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,827 psi | 64% | 2858 fps | 96% |
| Norma 201 | <<locked>> | 84% | 54,607 psi | 90% | 3091 fps | 100% |
| Norma 202 | <<locked>> | 82% | 51,822 psi | 85% | 3038 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,751 psi | 88% | 3133 fps | 100% |
| Norma 204 | <<locked>> | 94% | 52,460 psi | 86% | 3136 fps | 96.5% |
| Norma MRPᴾ | <<locked>> | 100% | 50,343 psi | 83% | 3205 fps | 97.9% |
| Norma URP | <<locked>> | 94% | 52,243 psi | 86% | 3146 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 54,404 psi | 89% | 3156 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,723 psi | 90% | 3202 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 54,969 psi | 90% | 3117 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,911 psi | 90% | 3136 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 60% | 2008 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 52,054 psi | 85% | 3074 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 51,561 psi | 85% | 3156 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 51,445 psi | 84% | 3196 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,084 psi | 87% | 3182 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,040 psi | 85% | 3209 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 86% | 55,071 psi | 90% | 3087 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,737 psi | 90% | 3130 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,924 psi | 87% | 3166 fps | 97% |
| Rottweil R 907 | <<locked>> | 92% | 54,665 psi | 90% | 3117 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 52,620 psi | 86% | 3081 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,301 psi | 86% | 3064 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,084 psi | 87% | 3077 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,751 psi | 88% | 3123 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,040 psi | 87% | 3140 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,606 psi | 88% | 3094 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,418 psi | 89% | 3117 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,330 psi | 86% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,214 psi | 87% | 2976 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,562 psi | 86% | 3031 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,431 psi | 86% | 3163 fps | 96.9% |
| Somchem S335 | <<locked>> | 82% | 52,011 psi | 85% | 2969 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,345 psi | 88% | 3081 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,781 psi | 90% | 3127 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,447 psi | 89% | 3205 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,635 psi | 88% | 3143 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 82% | 52,808 psi | 87% | 2956 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 51,909 psi | 85% | 3002 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 52,562 psi | 86% | 3015 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,852 psi | 87% | 3051 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,578 psi | 90% | 3146 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 86% | 54,114 psi | 89% | 3061 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,534 psi | 88% | 3146 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,734 psi | 82% | 3143 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,520 psi | 90% | 3114 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 52,518 psi | 86% | 3159 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,914 psi | 66% | 3087 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,476 psi | 89% | 3127 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,285 psi | 83% | 3074 fps | 96.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 45,600 psi | 75% | 2900 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,541 psi | 73% | 2884 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 38,101 psi | 63% | 2838 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 43,192 psi | 71% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,140 psi | 53% | 2713 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 49,197 psi | 81% | 3038 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,727 psi | 69% | 2871 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 48,051 psi | 79% | 3074 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,372 psi | 84% | 3041 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,556 psi | 75% | 3091 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 47,776 psi | 78% | 3068 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,698 psi | 68% | 2897 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,744 psi | 73% | 2969 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,256 psi | 53% | 2733 fps | 95.4% |
| Alliant Reloder-17 | 64 gr | 80% | 36,318 psi | 60% | 2871 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,253 psi | 78% | 3061 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,094 psi | 46% | 2628 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,521 psi | 60% | 2881 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,099 psi | 58% | 2897 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,834 psi | 80% | 3045 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 41,655 psi | 68% | 2904 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,279 psi | 69% | 2877 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,894 psi | 84% | 3068 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,250 psi | 69% | 2907 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 84% | 39,697 psi | 65% | 2900 fps | 95% |
| Hodgdon H4350 | <<locked>> | 86% | 46,093 psi | 76% | 2992 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 49,719 psi | 82% | 3048 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,631 psi | 49% | 2621 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,108 psi | 76% | 3022 fps | 100% |
| Hodgdon Superformance | 72.7 gr | 86% | 42,018 psi | 69% | 2979 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 44% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,645 psi | 78% | 2995 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 49,821 psi | 82% | 3031 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,845 psi | 72% | 2910 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,340 psi | 76% | 2936 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 42,786 psi | 70% | 2907 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,249 psi | 68% | 2854 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 31,227 psi | 51% | 2671 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 45,890 psi | 75% | 3002 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,372 psi | 84% | 3041 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,979 psi | 80% | 3009 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,617 psi | 80% | 2963 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,758 psi | 72% | 2907 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,984 psi | 59% | 2736 fps | 95.2% |
| Lovex S070 | <<locked>> | 84% | 39,001 psi | 64% | 2825 fps | 95% |
| Lovex S071 | <<locked>> | 98% | 36,390 psi | 60% | 2799 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,008 psi | 79% | 2979 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,588 psi | 80% | 2982 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,092 psi | 72% | 2956 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 48,849 psi | 80% | 3068 fps | 95.6% |
| Norma MRP | <<locked>> | 94% | 40,625 psi | 67% | 2995 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 32,445 psi | 53% | 2717 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 44,208 psi | 73% | 2976 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 38,870 psi | 64% | 2890 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 51,488 psi | 85% | 3058 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,343 psi | 84% | 3077 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,050 psi | 44% | 1798 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,670 psi | 70% | 2894 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,964 psi | 79% | 3091 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,725 psi | 64% | 2943 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,432 psi | 57% | 2795 fps | 95.9% |
| ReloadSwiss RS 70 | 68.2 gr | 84% | 36,579 psi | 60% | 2871 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 45,556 psi | 75% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,972 psi | 64% | 2838 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 96% | 45,963 psi | 75% | 3038 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 84% | 42,279 psi | 69% | 2877 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,984 psi | 59% | 2736 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,979 psi | 80% | 3009 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,758 psi | 72% | 2907 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,001 psi | 64% | 2825 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,379 psi | 66% | 2897 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,806 psi | 82% | 3028 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,776 psi | 78% | 3002 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,182 psi | 81% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,191 psi | 68% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,306 psi | 66% | 2792 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,513 psi | 75% | 3031 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 48,834 psi | 80% | 2917 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,661 psi | 82% | 3022 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,769 psi | 65% | 2848 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 29,095 psi | 48% | 2664 fps | 97.5% |
| Somchem S385 | <<locked>> | 94% | 43,787 psi | 72% | 2959 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 49,690 psi | 82% | 2907 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,571 psi | 75% | 2900 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,992 psi | 76% | 2910 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,811 psi | 62% | 2772 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 33,895 psi | 56% | 2723 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 44,396 psi | 73% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,344 psi | 55% | 2720 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 86% | 30,661 psi | 50% | 2713 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,475 psi | 55% | 2697 fps | 98% |
| Winchester 760 | <<locked>> | 84% | 39,842 psi | 65% | 2904 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,413 psi | 47% | 2720 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,529 psi | 78% | 3009 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,731 psi | 77% | 3005 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 95 powders for .300 Blaser Mag. loaded with the .308 | 150gr | Sako Powerhead Blade. Alliant Reloder-26 delivers the highest muzzle velocity at 3,255 fps; across all powders the maximum-charge window runs from 1,962 fps to 3,255 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 (420 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.0 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .300 Blaser Mag. with the .308 | 150gr | Sako Powerhead Blade 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.