Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 146.6gr | Sax KDG-S 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% | 51,982 psi | 85% | 3038 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,433 psi | 89% | 3100 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,891 psi | 77% | 3054 fps | 97.9% |
| Accurate 4064 | <<locked>> | 86% | 52,344 psi | 86% | 3094 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 52,881 psi | 87% | 3189 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 82% | 52,228 psi | 86% | 3127 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,664 psi | 88% | 3130 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,665 psi | 90% | 3232 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,505 psi | 89% | 3127 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 52,301 psi | 86% | 3255 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,462 psi | 89% | 3225 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,766 psi | 88% | 3153 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,201 psi | 89% | 3176 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,085 psi | 89% | 3255 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 51,561 psi | 85% | 3225 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,621 psi | 88% | 3215 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,251 psi | 73% | 3081 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,841 psi | 64% | 2972 fps | 96.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,662 psi | 83% | 3284 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,098 psi | 86% | 3136 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 54,491 psi | 89% | 3169 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,273 psi | 89% | 3140 fps | 97.8% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,375 psi | 89% | 3156 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 51,750 psi | 85% | 3123 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 92% | 52,040 psi | 85% | 3182 fps | 98% |
| Hodgdon H4350 | <<locked>> | 90% | 52,417 psi | 86% | 3146 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 82% | 52,794 psi | 87% | 3136 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,114 psi | 89% | 3173 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 52,866 psi | 87% | 3173 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,330 psi | 86% | 3222 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 59% | 1985 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,157 psi | 89% | 3143 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,142 psi | 87% | 3120 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,055 psi | 87% | 3114 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,518 psi | 86% | 3087 fps | 97.9% |
| IMR 4350 | <<locked>> | 96% | 55,114 psi | 90% | 3173 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,939 psi | 87% | 3120 fps | 98% |
| IMR 4831 | <<locked>> | 96% | 53,650 psi | 88% | 3182 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 52,199 psi | 86% | 3153 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,505 psi | 89% | 3127 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,243 psi | 86% | 3097 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,926 psi | 90% | 3104 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 52,881 psi | 87% | 3107 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 52,431 psi | 86% | 3114 fps | 99% |
| Lovex S070 | <<locked>> | 94% | 53,563 psi | 88% | 3153 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 54,389 psi | 89% | 3123 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,013 psi | 90% | 3120 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,432 psi | 88% | 3159 fps | 100% |
| Norma 204 | <<locked>> | 94% | 52,359 psi | 86% | 3166 fps | 96.3% |
| Norma MRPᴾ | <<locked>> | 100% | 50,067 psi | 82% | 3232 fps | 97.7% |
| Norma URP | <<locked>> | 94% | 51,996 psi | 85% | 3176 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 54,201 psi | 89% | 3186 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,607 psi | 90% | 3235 fps | 99.1% |
| Ramshot TAC | <<locked>> | 82% | 54,839 psi | 90% | 3150 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,795 psi | 90% | 3169 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 59% | 2031 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 51,909 psi | 85% | 3104 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,027 psi | 90% | 3251 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,013 psi | 90% | 3287 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 52,910 psi | 87% | 3212 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 51,895 psi | 85% | 3241 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 82% | 55,042 psi | 90% | 3100 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,824 psi | 90% | 3120 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,331 psi | 89% | 3159 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,518 psi | 86% | 3192 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 92% | 54,273 psi | 89% | 3140 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 52,431 psi | 86% | 3114 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,243 psi | 86% | 3097 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 52,881 psi | 87% | 3107 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,563 psi | 88% | 3153 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 52,837 psi | 87% | 3173 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,243 psi | 87% | 3123 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,346 psi | 89% | 3153 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,214 psi | 86% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 52,982 psi | 87% | 3005 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,388 psi | 86% | 3058 fps | 98% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,025 psi | 85% | 3186 fps | 96.6% |
| Somchem S335 | <<locked>> | 82% | 51,648 psi | 85% | 2999 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,040 psi | 87% | 3110 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,679 psi | 90% | 3159 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,331 psi | 89% | 3238 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,403 psi | 88% | 3173 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 82% | 52,692 psi | 87% | 2989 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,027 psi | 90% | 3081 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 52,359 psi | 86% | 3048 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,518 psi | 86% | 3077 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,360 psi | 89% | 3176 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 54,969 psi | 90% | 3127 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,041 psi | 89% | 3094 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,476 psi | 88% | 3179 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,385 psi | 81% | 3169 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,375 psi | 89% | 3143 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 52,257 psi | 86% | 3189 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,726 psi | 65% | 3110 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,346 psi | 89% | 3159 fps | 100% |
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% | 45,252 psi | 74% | 2930 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,527 psi | 73% | 2917 fps | 95.3% |
| Accurate 3100 | <<locked>> | 94% | 37,884 psi | 62% | 2864 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 42,859 psi | 70% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,995 psi | 53% | 2736 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 49,052 psi | 81% | 3068 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 41,640 psi | 68% | 2900 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 96% | 47,776 psi | 78% | 3100 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,184 psi | 84% | 3071 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,266 psi | 74% | 3114 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 47,659 psi | 78% | 3097 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,597 psi | 68% | 2923 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,570 psi | 73% | 2999 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,184 psi | 53% | 2759 fps | 95.1% |
| Alliant Reloder-17 | 64.8 gr | 80% | 36,143 psi | 59% | 2897 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,021 psi | 77% | 3087 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,936 psi | 49% | 2717 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,463 psi | 60% | 2904 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,853 psi | 57% | 2917 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,762 psi | 80% | 3074 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 41,481 psi | 68% | 2930 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 44,860 psi | 74% | 2959 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,618 psi | 83% | 3097 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,076 psi | 69% | 2933 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 42,279 psi | 69% | 2989 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 45,788 psi | 75% | 3018 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 49,545 psi | 81% | 3081 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,530 psi | 48% | 2648 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,861 psi | 75% | 3048 fps | 99.9% |
| Hodgdon Superformance | 73.6 gr | 86% | 41,814 psi | 69% | 3002 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 44% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,529 psi | 78% | 3025 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 49,705 psi | 82% | 3064 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,758 psi | 72% | 2940 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,195 psi | 76% | 2966 fps | 96.6% |
| IMR 4350 | <<locked>> | 88% | 42,699 psi | 70% | 2933 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,089 psi | 67% | 2881 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 33,286 psi | 55% | 2756 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 45,730 psi | 75% | 3031 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 51,184 psi | 84% | 3071 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,747 psi | 80% | 3041 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,501 psi | 80% | 2992 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 43,627 psi | 72% | 2940 fps | 99.9% |
| Lovex S065 | <<locked>> | 82% | 38,116 psi | 63% | 2818 fps | 95.8% |
| Lovex S070 | <<locked>> | 86% | 41,408 psi | 68% | 2910 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 47,688 psi | 78% | 3009 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,457 psi | 80% | 3015 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,961 psi | 72% | 2986 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 48,820 psi | 80% | 3097 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 43,468 psi | 71% | 3094 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 32,314 psi | 53% | 2743 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 43,976 psi | 72% | 3002 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 38,725 psi | 64% | 2913 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 51,198 psi | 84% | 3084 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,053 psi | 84% | 3104 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,919 psi | 44% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,467 psi | 70% | 2917 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,761 psi | 78% | 3123 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,493 psi | 63% | 2969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,330 psi | 56% | 2822 fps | 95.6% |
| ReloadSwiss RS 70 | 69.1 gr | 84% | 36,463 psi | 60% | 2894 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 51,663 psi | 85% | 3048 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,484 psi | 75% | 2956 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,856 psi | 64% | 2867 fps | 99% |
| Rottweil R 905 | <<locked>> | 96% | 45,934 psi | 75% | 3068 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 44,860 psi | 74% | 2959 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,116 psi | 63% | 2818 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,747 psi | 80% | 3041 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,627 psi | 72% | 2940 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 41,408 psi | 68% | 2910 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,176 psi | 66% | 2927 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,763 psi | 82% | 3061 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,572 psi | 78% | 3035 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,892 psi | 80% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,973 psi | 67% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,089 psi | 66% | 2815 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,646 psi | 80% | 3123 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 48,544 psi | 80% | 2946 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,603 psi | 81% | 3054 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 39,450 psi | 65% | 2871 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 28,834 psi | 47% | 2684 fps | 97.2% |
| Somchem S385 | <<locked>> | 94% | 43,569 psi | 72% | 2986 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 49,400 psi | 81% | 2940 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,281 psi | 74% | 2930 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,861 psi | 75% | 2940 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,695 psi | 62% | 2799 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,765 psi | 55% | 2749 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 51,547 psi | 85% | 3071 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,222 psi | 73% | 2930 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,199 psi | 55% | 2743 fps | 95% |
| Vihtavuori N555 | <<locked>> | 86% | 30,472 psi | 50% | 2736 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,417 psi | 55% | 2720 fps | 97.8% |
| Winchester 760 | <<locked>> | 86% | 42,467 psi | 70% | 2992 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,268 psi | 46% | 2740 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,268 psi | 78% | 3035 fps | 99.9% |
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 | 146.6gr | Sax KDG-S. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,287 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 146.6 gr projectile in 0.308" calls for a 1:12.5 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 | 146.6gr | Sax KDG-S 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.