Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 150gr | Peregrine Glider (Glider GRM) 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, 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% | 51,924 psi | 85% | 3002 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,375 psi | 89% | 3064 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,818 psi | 77% | 3022 fps | 98% |
| Accurate 4064 | <<locked>> | 86% | 52,373 psi | 86% | 3061 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 52,649 psi | 86% | 3153 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 82% | 52,170 psi | 86% | 3087 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,490 psi | 88% | 3094 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,650 psi | 90% | 3196 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,447 psi | 89% | 3087 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 52,214 psi | 86% | 3215 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,433 psi | 89% | 3189 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,824 psi | 88% | 3120 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,244 psi | 89% | 3140 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,085 psi | 89% | 3222 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 51,401 psi | 84% | 3189 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,621 psi | 88% | 3179 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,179 psi | 73% | 3048 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,783 psi | 64% | 2940 fps | 96.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,618 psi | 83% | 3248 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,214 psi | 86% | 3104 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 54,375 psi | 89% | 3133 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,215 psi | 89% | 3104 fps | 97.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,259 psi | 89% | 3120 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,114 psi | 90% | 3146 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 51,895 psi | 85% | 3150 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 90% | 52,170 psi | 86% | 3107 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 82% | 52,736 psi | 87% | 3100 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,172 psi | 89% | 3140 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 52,779 psi | 87% | 3136 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,141 psi | 86% | 3182 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,795 psi | 59% | 1959 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,940 psi | 89% | 3104 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,026 psi | 87% | 3081 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,040 psi | 87% | 3077 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,562 psi | 86% | 3051 fps | 98.1% |
| IMR 4350 | <<locked>> | 94% | 51,793 psi | 85% | 3081 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,866 psi | 87% | 3084 fps | 98.1% |
| IMR 4831 | <<locked>> | 96% | 53,476 psi | 88% | 3146 fps | 99.8% |
| IMR 4895 | <<locked>> | 84% | 52,214 psi | 86% | 3117 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,447 psi | 89% | 3087 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,040 psi | 85% | 3058 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,853 psi | 90% | 3068 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 52,823 psi | 87% | 3071 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 52,373 psi | 86% | 3074 fps | 99% |
| Lovex S070 | <<locked>> | 94% | 53,577 psi | 88% | 3117 fps | 98.5% |
| Norma 201 | <<locked>> | 84% | 54,331 psi | 89% | 3084 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,998 psi | 90% | 3084 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,505 psi | 88% | 3127 fps | 100% |
| Norma 204 | <<locked>> | 94% | 52,257 psi | 86% | 3130 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 49,922 psi | 82% | 3196 fps | 97.8% |
| Norma URP | <<locked>> | 94% | 51,996 psi | 85% | 3143 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 54,172 psi | 89% | 3150 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,288 psi | 89% | 3196 fps | 99.1% |
| Ramshot TAC | <<locked>> | 82% | 54,766 psi | 90% | 3114 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,694 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 60% | 2005 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 51,866 psi | 85% | 3071 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,882 psi | 90% | 3212 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,781 psi | 90% | 3248 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 52,852 psi | 87% | 3179 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 51,895 psi | 85% | 3209 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 54,839 psi | 90% | 3061 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,795 psi | 90% | 3084 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,462 psi | 89% | 3127 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,489 psi | 86% | 3159 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 92% | 54,215 psi | 89% | 3104 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 52,373 psi | 86% | 3074 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,040 psi | 85% | 3058 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 52,823 psi | 87% | 3071 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,577 psi | 88% | 3117 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 52,808 psi | 87% | 3136 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,388 psi | 88% | 3091 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,186 psi | 89% | 3114 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,272 psi | 86% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 52,982 psi | 87% | 2969 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,344 psi | 86% | 3025 fps | 98.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,996 psi | 85% | 3153 fps | 96.8% |
| Somchem S335 | <<locked>> | 84% | 55,100 psi | 90% | 3015 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,127 psi | 87% | 3077 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,534 psi | 90% | 3123 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,215 psi | 89% | 3202 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,200 psi | 87% | 3133 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 82% | 52,736 psi | 87% | 2953 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,926 psi | 90% | 3041 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 52,315 psi | 86% | 3012 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,634 psi | 86% | 3045 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,157 psi | 89% | 3136 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 54,940 psi | 90% | 3087 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,896 psi | 88% | 3054 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,316 psi | 88% | 3143 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,298 psi | 81% | 3133 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,375 psi | 89% | 3110 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 52,112 psi | 86% | 3153 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,755 psi | 65% | 3081 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,230 psi | 89% | 3120 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,922 psi | 82% | 3064 fps | 96% |
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% | 45,339 psi | 74% | 2897 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,527 psi | 73% | 2884 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 37,739 psi | 62% | 2831 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 42,917 psi | 70% | 2897 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,908 psi | 52% | 2707 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 48,950 psi | 80% | 3031 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,510 psi | 68% | 2864 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 47,848 psi | 79% | 3068 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,097 psi | 84% | 3035 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,310 psi | 74% | 3084 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 47,747 psi | 78% | 3068 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,481 psi | 68% | 2890 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,498 psi | 73% | 2963 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,053 psi | 53% | 2726 fps | 95.3% |
| Alliant Reloder-17 | 63.7 gr | 80% | 36,114 psi | 59% | 2867 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,079 psi | 77% | 3058 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,079 psi | 46% | 2625 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,390 psi | 60% | 2877 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,795 psi | 57% | 2887 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,617 psi | 80% | 3038 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 41,394 psi | 68% | 2897 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 42,061 psi | 69% | 2867 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,647 psi | 83% | 3061 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,003 psi | 69% | 2904 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 42,351 psi | 70% | 2959 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 86% | 45,876 psi | 75% | 2986 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 49,443 psi | 81% | 3041 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,428 psi | 48% | 2615 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,847 psi | 75% | 3015 fps | 99.9% |
| Hodgdon Superformance | 72.4 gr | 86% | 41,872 psi | 69% | 2972 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,658 psi | 44% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,442 psi | 78% | 2989 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 49,719 psi | 82% | 3028 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,627 psi | 72% | 2904 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,108 psi | 76% | 2930 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 42,583 psi | 70% | 2900 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,046 psi | 67% | 2848 fps | 95.2% |
| IMR 4831 | <<locked>> | 82% | 33,228 psi | 55% | 2726 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 45,629 psi | 75% | 2995 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 51,097 psi | 84% | 3035 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,704 psi | 80% | 3005 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,559 psi | 80% | 2959 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 43,685 psi | 72% | 2907 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,795 psi | 59% | 2730 fps | 95.1% |
| Lovex S070 | <<locked>> | 86% | 41,408 psi | 68% | 2881 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 47,747 psi | 78% | 2976 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,298 psi | 79% | 2976 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,859 psi | 72% | 2949 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 48,660 psi | 80% | 3064 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 40,263 psi | 66% | 2989 fps | 95% |
| Norma URP | <<locked>> | 80% | 32,387 psi | 53% | 2717 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 43,990 psi | 72% | 2969 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 38,638 psi | 63% | 2884 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 51,271 psi | 84% | 3051 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,111 psi | 84% | 3071 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 44% | 1795 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,453 psi | 70% | 2887 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,747 psi | 78% | 3087 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,508 psi | 63% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,229 psi | 56% | 2789 fps | 95.7% |
| ReloadSwiss RS 70 | 67.9 gr | 84% | 36,390 psi | 60% | 2864 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 51,692 psi | 85% | 3012 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,324 psi | 74% | 2920 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,914 psi | 64% | 2838 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 96% | 45,788 psi | 75% | 3035 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 42,061 psi | 69% | 2867 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,795 psi | 59% | 2730 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,704 psi | 80% | 3005 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,685 psi | 72% | 2907 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 41,408 psi | 68% | 2881 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,132 psi | 66% | 2894 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,574 psi | 81% | 3022 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,543 psi | 78% | 2995 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,907 psi | 80% | 2913 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,973 psi | 67% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,132 psi | 66% | 2785 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,353 psi | 74% | 3028 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 48,617 psi | 80% | 2913 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,429 psi | 81% | 3015 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,523 psi | 65% | 2841 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 28,906 psi | 47% | 2657 fps | 97.4% |
| Somchem S385 | <<locked>> | 94% | 43,424 psi | 71% | 2949 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 49,414 psi | 81% | 2904 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,281 psi | 74% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,934 psi | 75% | 2907 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,768 psi | 62% | 2769 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 33,678 psi | 55% | 2717 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 51,445 psi | 84% | 3035 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,179 psi | 73% | 2894 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,156 psi | 54% | 2713 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 86% | 30,458 psi | 50% | 2707 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,286 psi | 55% | 2690 fps | 97.9% |
| Winchester 760 | <<locked>> | 84% | 39,624 psi | 65% | 2897 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,152 psi | 46% | 2710 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,297 psi | 78% | 3002 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,572 psi | 76% | 3002 fps | 95.1% |
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 | 150gr | Peregrine Glider (Glider GRM). Alliant Reloder-26 delivers the highest muzzle velocity at 3,248 fps; across all powders the maximum-charge window runs from 1,959 fps to 3,248 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 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 | Peregrine Glider (Glider GRM) 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.