Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 150gr | Fox Classic Hunter 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, Alliant Reloder-17 and ReloadSwiss RS 60.
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>> | 84% | 52,446 psi | 86% | 3012 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,955 psi | 90% | 3077 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,398 psi | 78% | 3031 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 52,852 psi | 87% | 3068 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,330 psi | 88% | 3166 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 52,634 psi | 86% | 3097 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,128 psi | 89% | 3107 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 98% | 51,648 psi | 85% | 3143 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,926 psi | 90% | 3100 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 52,910 psi | 87% | 3232 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,955 psi | 90% | 3202 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,288 psi | 89% | 3127 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,708 psi | 90% | 3150 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,491 psi | 89% | 3232 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,040 psi | 85% | 3199 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,143 psi | 89% | 3189 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,875 psi | 74% | 3064 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,204 psi | 64% | 2953 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,372 psi | 84% | 3264 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,634 psi | 86% | 3114 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 55,071 psi | 90% | 3143 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,810 psi | 90% | 3117 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,679 psi | 90% | 3130 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 52,054 psi | 85% | 3100 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 92% | 52,431 psi | 86% | 3159 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 90% | 52,750 psi | 87% | 3123 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 82% | 53,200 psi | 87% | 3110 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,824 psi | 90% | 3150 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,214 psi | 87% | 3143 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,866 psi | 87% | 3199 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 59% | 1962 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,592 psi | 90% | 3117 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,606 psi | 88% | 3091 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,490 psi | 88% | 3087 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,924 psi | 87% | 3061 fps | 98.2% |
| IMR 4350 | <<locked>> | 94% | 52,141 psi | 86% | 3091 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,229 psi | 87% | 3094 fps | 98.2% |
| IMR 4831 | <<locked>> | 96% | 54,085 psi | 89% | 3156 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 52,663 psi | 86% | 3127 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,926 psi | 90% | 3100 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,750 psi | 87% | 3071 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 51,953 psi | 85% | 3022 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,330 psi | 88% | 3077 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 52,997 psi | 87% | 3091 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 54,143 psi | 89% | 3130 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,175 psi | 64% | 2864 fps | 96.1% |
| Norma 201 | <<locked>> | 84% | 54,795 psi | 90% | 3094 fps | 100% |
| Norma 202 | <<locked>> | 82% | 52,040 psi | 85% | 3041 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,954 psi | 89% | 3136 fps | 100% |
| Norma 204 | <<locked>> | 94% | 52,794 psi | 87% | 3143 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 50,676 psi | 83% | 3212 fps | 98% |
| Norma URP | <<locked>> | 94% | 52,634 psi | 86% | 3156 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 54,824 psi | 90% | 3163 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,114 psi | 90% | 3209 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,100 psi | 90% | 3140 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 60% | 2008 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 52,460 psi | 86% | 3081 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 51,837 psi | 85% | 3163 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 51,677 psi | 85% | 3199 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,490 psi | 88% | 3189 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,373 psi | 86% | 3219 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 84% | 52,069 psi | 85% | 3041 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,940 psi | 90% | 3136 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,316 psi | 88% | 3176 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 54,810 psi | 90% | 3117 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 52,997 psi | 87% | 3091 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,750 psi | 87% | 3071 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,330 psi | 88% | 3077 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,143 psi | 89% | 3130 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,214 psi | 87% | 3143 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,780 psi | 88% | 3097 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,795 psi | 90% | 3123 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,533 psi | 86% | 2976 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,403 psi | 88% | 2979 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,924 psi | 87% | 3035 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,837 psi | 87% | 3169 fps | 97% |
| Somchem S335 | <<locked>> | 82% | 52,243 psi | 86% | 2972 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,548 psi | 88% | 3087 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 51,808 psi | 85% | 3081 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,897 psi | 90% | 3212 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,940 psi | 89% | 3150 fps | 98% |
| Vihtavuori N133 | <<locked>> | 82% | 53,040 psi | 87% | 2959 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 52,156 psi | 86% | 3005 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 52,779 psi | 87% | 3022 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,055 psi | 87% | 3054 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,781 psi | 90% | 3150 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,282 psi | 76% | 2992 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 86% | 54,302 psi | 89% | 3064 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 53,882 psi | 88% | 3153 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,893 psi | 82% | 3146 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,868 psi | 90% | 3117 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 52,721 psi | 87% | 3166 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,205 psi | 66% | 3094 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,868 psi | 90% | 3133 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,618 psi | 83% | 3081 fps | 96.2% |
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% | 45,847 psi | 75% | 2907 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,889 psi | 74% | 2894 fps | 95.7% |
| Accurate 3100 | <<locked>> | 94% | 38,276 psi | 63% | 2844 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 43,424 psi | 71% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,343 psi | 53% | 2720 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 49,400 psi | 81% | 3041 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,916 psi | 69% | 2877 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 48,356 psi | 79% | 3081 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,576 psi | 85% | 3045 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,730 psi | 75% | 3094 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,254 psi | 79% | 3077 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,901 psi | 69% | 2900 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,962 psi | 74% | 2976 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,430 psi | 53% | 2740 fps | 95.5% |
| Alliant Reloder-17 | 64.3 gr | 80% | 36,521 psi | 60% | 2877 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,587 psi | 78% | 3068 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,369 psi | 47% | 2635 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,782 psi | 60% | 2890 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,230 psi | 58% | 2900 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,226 psi | 81% | 3051 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 41,858 psi | 69% | 2907 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,467 psi | 70% | 2881 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,097 psi | 84% | 3071 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,424 psi | 70% | 2913 fps | 98% |
| Hodgdon H414 | <<locked>> | 84% | 40,030 psi | 66% | 2907 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 86% | 46,253 psi | 76% | 2995 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 49,937 psi | 82% | 3051 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,805 psi | 49% | 2628 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,340 psi | 76% | 3025 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 42,351 psi | 70% | 2986 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,701 psi | 44% | 1759 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,863 psi | 79% | 2999 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,082 psi | 82% | 3035 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,063 psi | 72% | 2913 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,514 psi | 76% | 2940 fps | 96.9% |
| IMR 4350 | <<locked>> | 88% | 43,120 psi | 71% | 2913 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,423 psi | 68% | 2861 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 31,430 psi | 52% | 2674 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 46,108 psi | 76% | 3009 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,576 psi | 85% | 3045 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,182 psi | 81% | 3012 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,820 psi | 80% | 2966 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,976 psi | 72% | 2913 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,172 psi | 59% | 2740 fps | 95.3% |
| Lovex S070 | <<locked>> | 84% | 39,204 psi | 64% | 2831 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 36,521 psi | 60% | 2802 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 48,225 psi | 79% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,805 psi | 80% | 2986 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,309 psi | 73% | 2959 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 49,211 psi | 81% | 3077 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 40,959 psi | 67% | 3005 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 32,634 psi | 54% | 2723 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 44,425 psi | 73% | 2979 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 39,175 psi | 64% | 2897 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,517 psi | 85% | 3081 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,079 psi | 44% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,873 psi | 70% | 2897 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,225 psi | 79% | 3097 fps | 99.6% |
| ReloadSwiss RS 60 | 64.3 gr | 80% | 38,899 psi | 64% | 2949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,606 psi | 57% | 2802 fps | 95.9% |
| ReloadSwiss RS 70 | 66.9 gr | 82% | 34,272 psi | 56% | 2805 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 45,788 psi | 75% | 2930 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,175 psi | 64% | 2844 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 96% | 46,340 psi | 76% | 3045 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 42,467 psi | 70% | 2881 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,172 psi | 59% | 2740 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,182 psi | 81% | 3012 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,976 psi | 72% | 2913 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,204 psi | 64% | 2831 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,553 psi | 67% | 2904 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,241 psi | 82% | 3038 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,964 psi | 79% | 3009 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,414 psi | 81% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,408 psi | 68% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,437 psi | 66% | 2795 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,905 psi | 75% | 3038 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 49,052 psi | 81% | 2923 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,082 psi | 82% | 3028 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,972 psi | 66% | 2851 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,269 psi | 48% | 2671 fps | 97.6% |
| Somchem S385 | <<locked>> | 94% | 43,947 psi | 72% | 2963 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 49,922 psi | 82% | 2910 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,832 psi | 75% | 2904 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,209 psi | 76% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,000 psi | 62% | 2776 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 34,069 psi | 56% | 2726 fps | 95.9% |
| Vihtavuori N165 | <<locked>> | 98% | 43,323 psi | 71% | 2933 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 44,599 psi | 73% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,533 psi | 55% | 2726 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 86% | 30,864 psi | 51% | 2720 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,750 psi | 55% | 2703 fps | 98.1% |
| Winchester 760 | <<locked>> | 84% | 40,030 psi | 66% | 2907 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,529 psi | 47% | 2726 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,703 psi | 78% | 3012 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,065 psi | 77% | 3012 fps | 95.3% |
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 | Fox Classic Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,264 fps; across all powders the maximum-charge window runs from 1,962 fps to 3,264 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 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Power Pro Varmint, Alliant Reloder-19 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-17, ReloadSwiss RS 60 rank at the top here: for .300 Blaser Mag. with the .308 | 150gr | Fox Classic Hunter 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.