Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 146gr | Peregrine Glider (Glider GRM) bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 and Hodgdon Superformance.
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% | 54,549 psi | 90% | 3081 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,664 psi | 88% | 3087 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,905 psi | 75% | 3038 fps | 97.6% |
| Accurate 4064 | <<locked>> | 88% | 54,839 psi | 90% | 3136 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 51,924 psi | 85% | 3179 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 54,911 psi | 90% | 3173 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 52,852 psi | 87% | 3120 fps | 99.8% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,766 psi | 88% | 3215 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,853 psi | 88% | 3120 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 51,430 psi | 84% | 3241 fps | 99.8% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,476 psi | 88% | 3209 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,113 psi | 87% | 3143 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,534 psi | 88% | 3169 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,258 psi | 87% | 3248 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,505 psi | 89% | 3278 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,692 psi | 87% | 3199 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,540 psi | 71% | 3071 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,676 psi | 82% | 3268 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,085 psi | 90% | 3189 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 53,563 psi | 88% | 3159 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,490 psi | 88% | 3130 fps | 97.6% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,505 psi | 88% | 3146 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,331 psi | 89% | 3173 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 54,694 psi | 90% | 3235 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 92% | 55,013 psi | 90% | 3196 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 82% | 52,112 psi | 86% | 3127 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,272 psi | 87% | 3163 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 51,996 psi | 85% | 3163 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 51,401 psi | 84% | 3205 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,636 psi | 59% | 1985 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 53,316 psi | 88% | 3130 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 52,330 psi | 86% | 3110 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 52,185 psi | 86% | 3100 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 51,953 psi | 85% | 3077 fps | 97.8% |
| IMR 4350 | <<locked>> | 96% | 54,375 psi | 89% | 3163 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,199 psi | 86% | 3110 fps | 97.7% |
| IMR 4831 | <<locked>> | 96% | 52,591 psi | 86% | 3169 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 54,940 psi | 90% | 3202 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,853 psi | 88% | 3120 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,042 psi | 90% | 3143 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,259 psi | 89% | 3097 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 52,185 psi | 86% | 3097 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,042 psi | 90% | 3156 fps | 99.2% |
| Lovex S070 | <<locked>> | 94% | 52,765 psi | 87% | 3140 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 53,476 psi | 88% | 3114 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,346 psi | 89% | 3117 fps | 100% |
| Norma 203B | <<locked>> | 86% | 52,794 psi | 87% | 3153 fps | 100% |
| Norma 204 | <<locked>> | 94% | 51,401 psi | 84% | 3150 fps | 95.9% |
| Norma MRPᴾ | <<locked>> | 100% | 49,168 psi | 81% | 3219 fps | 97.4% |
| Norma URP | <<locked>> | 96% | 54,650 psi | 90% | 3225 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 53,359 psi | 88% | 3176 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,577 psi | 88% | 3219 fps | 98.9% |
| Ramshot TAC | <<locked>> | 82% | 54,085 psi | 89% | 3136 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,969 psi | 89% | 3159 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,129 psi | 59% | 2031 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,708 psi | 90% | 3156 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,056 psi | 89% | 3238 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,099 psi | 89% | 3278 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 51,866 psi | 85% | 3199 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,882 psi | 90% | 3297 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 54,302 psi | 89% | 3094 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,172 psi | 89% | 3114 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,650 psi | 88% | 3153 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,764 psi | 85% | 3182 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 92% | 53,490 psi | 88% | 3130 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,042 psi | 90% | 3156 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,042 psi | 90% | 3143 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 52,185 psi | 86% | 3097 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 52,765 psi | 87% | 3140 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 51,996 psi | 85% | 3159 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 52,663 psi | 86% | 3114 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,476 psi | 88% | 3140 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,795 psi | 90% | 3045 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 52,141 psi | 86% | 2995 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 51,648 psi | 85% | 3048 fps | 97.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,271 psi | 84% | 3176 fps | 96.3% |
| Somchem S335 | <<locked>> | 84% | 54,302 psi | 89% | 3041 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,402 psi | 86% | 3104 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 53,780 psi | 88% | 3150 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 53,142 psi | 87% | 3225 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,475 psi | 86% | 3156 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 82% | 51,967 psi | 85% | 2982 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,244 psi | 89% | 3074 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,868 psi | 90% | 3091 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 51,895 psi | 85% | 3071 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,490 psi | 88% | 3163 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 54,317 psi | 89% | 3117 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,200 psi | 87% | 3084 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,475 psi | 86% | 3166 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,530 psi | 80% | 3156 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,447 psi | 88% | 3133 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,563 psi | 90% | 3166 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,926 psi | 90% | 3238 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,972 psi | 64% | 3094 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,476 psi | 88% | 3150 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% | 44,715 psi | 73% | 2927 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,758 psi | 72% | 2900 fps | 95% |
| Accurate 3100 | <<locked>> | 94% | 37,173 psi | 61% | 2848 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 42,308 psi | 69% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,707 psi | 55% | 2789 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 48,385 psi | 79% | 3058 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,046 psi | 67% | 2890 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 98% | 50,299 psi | 83% | 3150 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,517 psi | 83% | 3064 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,628 psi | 73% | 3104 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,125 psi | 82% | 3150 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,944 psi | 67% | 2913 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,932 psi | 72% | 2989 fps | 99% |
| Alliant Reloder-16 | 61 gr | 82% | 33,808 psi | 56% | 2808 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,592 psi | 58% | 2884 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,385 psi | 81% | 3136 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,370 psi | 48% | 2700 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,272 psi | 56% | 2900 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,964 psi | 79% | 3064 fps | 99.2% |
| Bofors RP3 | <<locked>> | 80% | 40,625 psi | 67% | 2917 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 44,135 psi | 72% | 2946 fps | 95.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,980 psi | 82% | 3091 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,481 psi | 68% | 2927 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 86% | 41,684 psi | 68% | 2979 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 88% | 48,240 psi | 79% | 3068 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 48,878 psi | 80% | 3071 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,037 psi | 48% | 2631 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,208 psi | 74% | 3038 fps | 99.9% |
| Hodgdon Superformance | 74.5 gr | 88% | 44,338 psi | 73% | 3061 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 44% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,891 psi | 77% | 3015 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 48,878 psi | 80% | 3054 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,105 psi | 71% | 2930 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,600 psi | 75% | 2953 fps | 96.4% |
| IMR 4350 | <<locked>> | 90% | 44,759 psi | 73% | 2982 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,221 psi | 71% | 2930 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 32,706 psi | 54% | 2743 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 45,049 psi | 74% | 3022 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 50,517 psi | 83% | 3064 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,834 psi | 79% | 3028 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,877 psi | 79% | 2982 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 43,004 psi | 71% | 2927 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 37,565 psi | 62% | 2805 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 40,654 psi | 67% | 2897 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 47,224 psi | 78% | 3002 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,761 psi | 78% | 3009 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,308 psi | 71% | 2972 fps | 99.2% |
| Norma 204 | <<locked>> | 92% | 47,877 psi | 79% | 3081 fps | 95% |
| Norma MRP | <<locked>> | 96% | 42,627 psi | 70% | 3077 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 34,026 psi | 56% | 2792 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 43,352 psi | 71% | 2989 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 38,072 psi | 63% | 2900 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 50,662 psi | 83% | 3077 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,444 psi | 83% | 3097 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,905 psi | 44% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,742 psi | 69% | 2904 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,992 psi | 77% | 3110 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,956 psi | 62% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,591 psi | 55% | 2805 fps | 95.1% |
| ReloadSwiss RS 70 | 68.3 gr | 84% | 35,839 psi | 59% | 2877 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 50,952 psi | 84% | 3038 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,831 psi | 74% | 2946 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,203 psi | 63% | 2854 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 48,356 psi | 79% | 3120 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 86% | 44,135 psi | 72% | 2946 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,565 psi | 62% | 2805 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,834 psi | 79% | 3028 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,004 psi | 71% | 2927 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 40,654 psi | 67% | 2897 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,537 psi | 65% | 2913 fps | 98.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,921 psi | 80% | 3045 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,978 psi | 77% | 3022 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,457 psi | 80% | 2946 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,538 psi | 67% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,264 psi | 69% | 2864 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,892 psi | 79% | 3110 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 48,095 psi | 79% | 2943 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,776 psi | 80% | 3041 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 39,015 psi | 64% | 2861 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 28,311 psi | 46% | 2671 fps | 96.8% |
| Somchem S385 | <<locked>> | 96% | 45,745 psi | 75% | 3031 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 80% | 48,936 psi | 80% | 2933 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,773 psi | 74% | 2923 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,208 psi | 74% | 2933 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,101 psi | 61% | 2789 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 33,185 psi | 54% | 2736 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 50,647 psi | 83% | 3058 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,642 psi | 72% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,041 psi | 58% | 2799 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 88% | 32,068 psi | 53% | 2785 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,822 psi | 54% | 2707 fps | 97.5% |
| Winchester 748 | <<locked>> | 80% | 50,923 psi | 84% | 3110 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,684 psi | 68% | 2979 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,789 psi | 46% | 2720 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,630 psi | 77% | 3028 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 95 powders for .300 Blaser Mag. loaded with the .308 | 146gr | Peregrine Glider (Glider GRM). ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,297 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,297 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 146.0 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. Alliant Reloder-16, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .300 Blaser Mag. with the .308 | 146gr | 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.