Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 150gr | Hornady ECX 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, Alliant Reloder-16 and ReloadSwiss RS 70.
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% | 53,374 psi | 88% | 3028 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 51,967 psi | 85% | 3031 fps | 97.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,631 psi | 80% | 3058 fps | 98.4% |
| Accurate 4064 | <<locked>> | 86% | 53,708 psi | 88% | 3084 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,549 psi | 90% | 3189 fps | 99.9% |
| Accurate High Countryᴾ | <<locked>> | 100% | 53,316 psi | 88% | 3264 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 82% | 53,417 psi | 88% | 3117 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,839 psi | 90% | 3123 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 52,591 psi | 86% | 3166 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,867 psi | 88% | 3251 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 52,446 psi | 86% | 3163 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 51,909 psi | 85% | 3091 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 52,098 psi | 86% | 3114 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 94% | 52,141 psi | 86% | 3196 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 53,171 psi | 87% | 3222 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,706 psi | 85% | 3153 fps | 96.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,631 psi | 80% | 3140 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,818 psi | 75% | 3087 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,943 psi | 66% | 2976 fps | 97.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,547 psi | 86% | 3287 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,519 psi | 88% | 3130 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 52,301 psi | 86% | 3104 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,631 psi | 80% | 3140 fps | 96.2% |
| Bofors RP7 | <<locked>> | 90% | 52,272 psi | 86% | 3077 fps | 97.7% |
| Hodgdon H380 | <<locked>> | 86% | 52,982 psi | 87% | 3120 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 92% | 53,534 psi | 88% | 3182 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 90% | 53,577 psi | 88% | 3140 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 82% | 53,983 psi | 89% | 3127 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 52,156 psi | 86% | 3114 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,186 psi | 89% | 3163 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,795 psi | 88% | 3219 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,795 psi | 59% | 1969 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 51,793 psi | 85% | 3074 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,520 psi | 90% | 3110 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,215 psi | 89% | 3104 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,592 psi | 88% | 3081 fps | 98.4% |
| IMR 4350 | <<locked>> | 94% | 53,098 psi | 87% | 3110 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,998 psi | 89% | 3110 fps | 98.4% |
| IMR 4831 | <<locked>> | 94% | 51,547 psi | 85% | 3120 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 53,432 psi | 88% | 3143 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,534 psi | 88% | 3087 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 52,707 psi | 87% | 3038 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,056 psi | 89% | 3097 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,824 psi | 88% | 3107 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 54,955 psi | 90% | 3150 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,958 psi | 66% | 2884 fps | 96.4% |
| Norma 201 | <<locked>> | 82% | 52,228 psi | 86% | 3058 fps | 100% |
| Norma 202 | <<locked>> | 82% | 52,852 psi | 87% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,926 psi | 90% | 3156 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,795 psi | 88% | 3166 fps | 96.9% |
| Norma MRPᴾ | <<locked>> | 100% | 51,547 psi | 85% | 3232 fps | 98.2% |
| Norma URP | <<locked>> | 94% | 53,534 psi | 88% | 3173 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 84% | 52,098 psi | 86% | 3123 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 52,475 psi | 86% | 3169 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,318 psi | 60% | 2014 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,287 psi | 87% | 3104 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 52,634 psi | 86% | 3179 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,794 psi | 87% | 3219 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,578 psi | 90% | 3212 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,548 psi | 88% | 3241 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 52,852 psi | 87% | 3058 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 52,402 psi | 86% | 3097 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,259 psi | 89% | 3136 fps | 95.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,331 psi | 89% | 3199 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 90% | 52,272 psi | 86% | 3077 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,824 psi | 88% | 3107 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,534 psi | 88% | 3087 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,056 psi | 89% | 3097 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,955 psi | 90% | 3150 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,346 psi | 89% | 3166 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,679 psi | 90% | 3117 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 51,996 psi | 85% | 3084 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,359 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,128 psi | 89% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,722 psi | 88% | 3054 fps | 98.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,838 psi | 88% | 3192 fps | 97.3% |
| Somchem S335 | <<locked>> | 82% | 52,968 psi | 87% | 2989 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,447 psi | 89% | 3107 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 52,504 psi | 86% | 3097 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 52,199 psi | 86% | 3173 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,926 psi | 90% | 3169 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 82% | 53,853 psi | 88% | 2976 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,055 psi | 87% | 3022 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,519 psi | 88% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,954 psi | 89% | 3071 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 52,170 psi | 86% | 3110 fps | 99.7% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,355 psi | 78% | 3018 fps | 96.3% |
| Vihtavuori N540 | <<locked>> | 84% | 51,706 psi | 85% | 3028 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,926 psi | 90% | 3173 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,024 psi | 84% | 3169 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 52,156 psi | 86% | 3081 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,766 psi | 88% | 3186 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,147 psi | 68% | 3120 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 51,996 psi | 85% | 3091 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,547 psi | 85% | 3100 fps | 96.6% |
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% | 46,514 psi | 76% | 2920 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,527 psi | 75% | 2910 fps | 96% |
| Accurate 3100 | <<locked>> | 92% | 36,448 psi | 60% | 2805 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 44,063 psi | 72% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,054 psi | 54% | 2740 fps | 95.8% |
| Accurate High Country | <<locked>> | 98% | 49,632 psi | 81% | 3199 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 50,183 psi | 82% | 3061 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,641 psi | 70% | 2897 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 94% | 46,021 psi | 76% | 3038 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,644 psi | 77% | 3117 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,977 psi | 75% | 3038 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,685 psi | 70% | 2920 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,687 psi | 75% | 2992 fps | 99.4% |
| Alliant Reloder-16 | 60.7 gr | 80% | 33,054 psi | 54% | 2762 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,144 psi | 61% | 2897 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,339 psi | 74% | 3028 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,382 psi | 75% | 3074 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,877 psi | 47% | 2657 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,041 psi | 58% | 2844 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,576 psi | 55% | 2854 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,908 psi | 82% | 3071 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 42,612 psi | 70% | 2927 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,382 psi | 75% | 3074 fps | 95.3% |
| Bofors RP7 | <<locked>> | 84% | 43,091 psi | 71% | 2900 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 43,149 psi | 71% | 2933 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 40,654 psi | 67% | 2927 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 84% | 44,019 psi | 72% | 2956 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 50,705 psi | 83% | 3071 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,414 psi | 50% | 2648 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,282 psi | 78% | 3045 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,018 psi | 71% | 3005 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 44% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,617 psi | 80% | 3018 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,039 psi | 84% | 3054 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,817 psi | 74% | 2933 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,181 psi | 77% | 2963 fps | 97.2% |
| IMR 4350 | <<locked>> | 88% | 43,700 psi | 72% | 2933 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,047 psi | 69% | 2877 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 32,082 psi | 53% | 2697 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 46,876 psi | 77% | 3025 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 50,024 psi | 82% | 3031 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,545 psi | 81% | 2986 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,730 psi | 73% | 2933 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,666 psi | 60% | 2756 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 39,813 psi | 65% | 2851 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 37,492 psi | 62% | 2828 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 48,820 psi | 80% | 2999 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,617 psi | 81% | 3005 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,063 psi | 74% | 2979 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 46,818 psi | 77% | 3035 fps | 95.2% |
| Norma MRP | <<locked>> | 94% | 41,800 psi | 69% | 3028 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 33,301 psi | 55% | 2743 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 45,310 psi | 74% | 2999 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 37,130 psi | 61% | 2848 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,093 psi | 44% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,497 psi | 71% | 2917 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,066 psi | 81% | 3117 fps | 99.7% |
| ReloadSwiss RS 60 | 65.3 gr | 80% | 39,552 psi | 65% | 2966 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,953 psi | 54% | 2759 fps | 95.3% |
| ReloadSwiss RS 70 | 68 gr | 82% | 34,911 psi | 57% | 2828 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 46,586 psi | 76% | 2949 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,958 psi | 66% | 2864 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 96% | 50,865 psi | 84% | 3074 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 96% | 47,340 psi | 78% | 3071 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 84% | 43,091 psi | 71% | 2900 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,666 psi | 60% | 2756 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,024 psi | 82% | 3031 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,730 psi | 73% | 2933 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 39,813 psi | 65% | 2851 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,263 psi | 68% | 2920 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,894 psi | 84% | 3054 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,675 psi | 80% | 3025 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,009 psi | 82% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,989 psi | 69% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,046 psi | 67% | 2815 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,905 psi | 77% | 3064 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 49,617 psi | 81% | 2936 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,734 psi | 83% | 3045 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,495 psi | 66% | 2867 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 29,892 psi | 49% | 2694 fps | 98% |
| Somchem S385 | <<locked>> | 92% | 41,887 psi | 69% | 2923 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 50,546 psi | 83% | 2927 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,514 psi | 76% | 2917 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,978 psi | 77% | 2930 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,696 psi | 64% | 2795 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 34,737 psi | 57% | 2749 fps | 96.3% |
| Vihtavuori N165 | <<locked>> | 98% | 44,179 psi | 73% | 2956 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 45,281 psi | 74% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,142 psi | 56% | 2743 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 86% | 31,676 psi | 52% | 2743 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,214 psi | 56% | 2720 fps | 98.3% |
| Winchester 760 | <<locked>> | 84% | 40,843 psi | 67% | 2930 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,282 psi | 45% | 2680 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,617 psi | 80% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,935 psi | 79% | 3035 fps | 95.7% |
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 Blaser Mag. loaded with the .308 | 150gr | Hornady ECX. Alliant Reloder-26 delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 1,969 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 150.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Alliant Reloder-22 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-16, ReloadSwiss RS 70 rank at the top here: for .300 Blaser Mag. with the .308 | 150gr | Hornady ECX 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.