Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 144gr | Lehigh Defense Match Solid bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 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.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 54,418 psi | 89% | 3100 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,505 psi | 88% | 3107 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,832 psi | 75% | 3054 fps | 97.5% |
| Accurate 4064 | <<locked>> | 88% | 54,723 psi | 90% | 3156 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 51,445 psi | 84% | 3189 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 84% | 54,824 psi | 90% | 3196 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 52,736 psi | 87% | 3140 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,505 psi | 88% | 3228 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,548 psi | 88% | 3136 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,853 psi | 90% | 3110 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,984 psi | 90% | 3323 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,432 psi | 88% | 3228 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 52,765 psi | 87% | 3159 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,185 psi | 87% | 3186 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,011 psi | 87% | 3264 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,215 psi | 89% | 3297 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,634 psi | 86% | 3219 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,294 psi | 71% | 3084 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,327 psi | 81% | 3281 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,897 psi | 90% | 3209 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 53,388 psi | 88% | 3176 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,359 psi | 88% | 3146 fps | 97.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,127 psi | 87% | 3163 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,172 psi | 89% | 3192 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 54,447 psi | 89% | 3251 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 54,824 psi | 90% | 3212 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 82% | 51,808 psi | 85% | 3143 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 52,982 psi | 87% | 3179 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 51,605 psi | 85% | 3179 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,100 psi | 90% | 3291 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 59% | 2001 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,185 psi | 87% | 3150 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 51,996 psi | 85% | 3130 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 52,098 psi | 86% | 3120 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 51,634 psi | 85% | 3091 fps | 97.6% |
| IMR 4350 | <<locked>> | 96% | 54,157 psi | 89% | 3179 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,054 psi | 85% | 3127 fps | 97.6% |
| IMR 4831 | <<locked>> | 96% | 52,359 psi | 86% | 3186 fps | 99.6% |
| IMR 4895 | <<locked>> | 86% | 54,592 psi | 90% | 3219 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,548 psi | 88% | 3136 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,665 psi | 90% | 3159 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,012 psi | 89% | 3114 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 51,880 psi | 85% | 3114 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,853 psi | 90% | 3176 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 52,591 psi | 86% | 3156 fps | 98% |
| Norma 201 | <<locked>> | 84% | 53,388 psi | 88% | 3130 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,041 psi | 89% | 3133 fps | 100% |
| Norma 203B | <<locked>> | 86% | 52,431 psi | 86% | 3169 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 54,882 psi | 90% | 3232 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 48,834 psi | 80% | 3232 fps | 97.2% |
| Norma URP | <<locked>> | 96% | 54,418 psi | 89% | 3241 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 53,156 psi | 87% | 3196 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,301 psi | 88% | 3235 fps | 98.7% |
| Ramshot TAC | <<locked>> | 82% | 53,940 psi | 89% | 3156 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,592 psi | 88% | 3173 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 59% | 2047 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,505 psi | 89% | 3173 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,867 psi | 88% | 3258 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 53,867 psi | 88% | 3294 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 51,576 psi | 85% | 3215 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,621 psi | 90% | 3310 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 54,012 psi | 89% | 3110 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,824 psi | 88% | 3127 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,272 psi | 87% | 3169 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,474 psi | 85% | 3199 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 92% | 53,359 psi | 88% | 3146 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,853 psi | 90% | 3176 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,665 psi | 90% | 3159 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 51,880 psi | 85% | 3114 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 52,591 psi | 86% | 3156 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 51,619 psi | 85% | 3176 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 52,272 psi | 86% | 3127 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,388 psi | 88% | 3159 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,752 psi | 90% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 52,040 psi | 85% | 3015 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,969 psi | 90% | 3123 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,995 psi | 84% | 3192 fps | 96.1% |
| Somchem S335 | <<locked>> | 84% | 54,201 psi | 89% | 3061 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,054 psi | 85% | 3120 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 53,606 psi | 88% | 3169 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 52,837 psi | 87% | 3241 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,170 psi | 86% | 3173 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 82% | 51,764 psi | 85% | 2999 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,911 psi | 89% | 3091 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,737 psi | 90% | 3110 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,013 psi | 90% | 3140 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,055 psi | 87% | 3179 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 53,969 psi | 89% | 3133 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 52,852 psi | 87% | 3100 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,243 psi | 86% | 3182 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,008 psi | 79% | 3169 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,171 psi | 87% | 3150 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,447 psi | 89% | 3189 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,679 psi | 90% | 3255 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,899 psi | 64% | 3107 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,359 psi | 88% | 3166 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% | 44,454 psi | 73% | 2940 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,746 psi | 77% | 2982 fps | 95.7% |
| Accurate 3100 | <<locked>> | 96% | 39,668 psi | 65% | 2927 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 42,076 psi | 69% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,431 psi | 55% | 2802 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 48,109 psi | 79% | 3074 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,828 psi | 67% | 2907 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 50,067 psi | 82% | 3166 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,270 psi | 83% | 3081 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,227 psi | 84% | 3058 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,324 psi | 73% | 3117 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 49,879 psi | 82% | 3163 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,683 psi | 67% | 2930 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,685 psi | 72% | 3002 fps | 98.9% |
| Alliant Reloder-16 | 61.3 gr | 82% | 33,605 psi | 55% | 2822 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,346 psi | 58% | 2897 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,153 psi | 81% | 3153 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,283 psi | 48% | 2713 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,608 psi | 60% | 2986 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,834 psi | 79% | 3084 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 40,538 psi | 67% | 2933 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 44,019 psi | 72% | 2966 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,632 psi | 81% | 3104 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,191 psi | 68% | 2936 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 86% | 41,350 psi | 68% | 2989 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 48,095 psi | 79% | 3087 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 48,602 psi | 80% | 3084 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,848 psi | 47% | 2644 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,918 psi | 74% | 3054 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 44,135 psi | 72% | 3074 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 44% | 1791 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,615 psi | 77% | 3031 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 48,617 psi | 80% | 3074 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,888 psi | 70% | 2943 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,382 psi | 75% | 2969 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 44,599 psi | 73% | 2995 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,946 psi | 71% | 2943 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 32,474 psi | 53% | 2753 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 44,788 psi | 74% | 3038 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 50,270 psi | 83% | 3081 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,718 psi | 78% | 3048 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,630 psi | 78% | 2999 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 42,757 psi | 70% | 2943 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 37,507 psi | 62% | 2825 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 40,567 psi | 67% | 2913 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 46,963 psi | 77% | 3018 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,500 psi | 78% | 3025 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,033 psi | 71% | 2989 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 51,126 psi | 84% | 3166 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 42,380 psi | 70% | 3087 fps | 95.2% |
| Norma URP | <<locked>> | 82% | 33,939 psi | 56% | 2808 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 43,047 psi | 71% | 3005 fps | 99% |
| Ramshot Hunter | 69.7 gr | 88% | 40,422 psi | 66% | 2976 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 50,328 psi | 83% | 3094 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,096 psi | 82% | 3110 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,861 psi | 44% | 1834 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,684 psi | 68% | 2923 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,688 psi | 77% | 3127 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,652 psi | 62% | 2972 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,998 psi | 59% | 2887 fps | 96% |
| ReloadSwiss RS 70 | 68.7 gr | 84% | 35,694 psi | 59% | 2890 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 50,705 psi | 83% | 3054 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,585 psi | 73% | 2963 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 37,942 psi | 62% | 2867 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 98% | 47,892 psi | 79% | 3130 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 86% | 44,019 psi | 72% | 2966 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,507 psi | 62% | 2825 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,718 psi | 78% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,757 psi | 70% | 2943 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 40,567 psi | 67% | 2913 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,291 psi | 65% | 2930 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,820 psi | 80% | 3064 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,673 psi | 77% | 3038 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,225 psi | 79% | 2963 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,335 psi | 66% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,959 psi | 69% | 2877 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,427 psi | 78% | 3120 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 47,848 psi | 79% | 2959 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,675 psi | 80% | 3058 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 38,812 psi | 64% | 2877 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 28,253 psi | 46% | 2687 fps | 96.7% |
| Somchem S385 | <<locked>> | 96% | 45,527 psi | 75% | 3048 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 48,718 psi | 80% | 2949 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,527 psi | 73% | 2940 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,962 psi | 74% | 2949 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,883 psi | 61% | 2802 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 35,273 psi | 58% | 2808 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 50,575 psi | 83% | 3077 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,381 psi | 71% | 2936 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,795 psi | 57% | 2808 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 31,763 psi | 52% | 2795 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,764 psi | 54% | 2723 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 50,778 psi | 83% | 3130 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,539 psi | 68% | 2995 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,501 psi | 48% | 2802 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,325 psi | 76% | 3045 fps | 99.8% |
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 Blaser Mag. loaded with the .308 | 144gr | Lehigh Defense Match Solid. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 2,001 fps to 3,323 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 (420 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 144.0 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, Alliant Reloder-16, Ramshot Hunter rank at the top here: for .300 Blaser Mag. with the .308 | 144gr | Lehigh Defense Match Solid 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.