Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 155.8gr | 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 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.
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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% | 52,866 psi | 87% | 2956 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 51,663 psi | 85% | 2966 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,979 psi | 79% | 2989 fps | 98.5% |
| Accurate 4064 | <<locked>> | 86% | 53,330 psi | 88% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,969 psi | 89% | 3117 fps | 99.9% |
| Accurate High Countryᴾ | <<locked>> | 100% | 52,823 psi | 87% | 3199 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 82% | 53,185 psi | 87% | 3048 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,578 psi | 90% | 3054 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 52,069 psi | 85% | 3097 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,316 psi | 88% | 3179 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 51,938 psi | 85% | 3094 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,795 psi | 90% | 3074 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 51,735 psi | 85% | 3045 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,056 psi | 90% | 3182 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,620 psi | 86% | 3153 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,679 psi | 90% | 3146 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,109 psi | 79% | 3074 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,310 psi | 74% | 3018 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,610 psi | 65% | 2917 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,735 psi | 85% | 3215 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,171 psi | 87% | 3064 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 51,866 psi | 85% | 3035 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,109 psi | 79% | 3074 fps | 96.3% |
| Bofors RP7 | <<locked>> | 90% | 51,750 psi | 85% | 3009 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 86% | 52,591 psi | 86% | 3051 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 53,055 psi | 87% | 3114 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 90% | 53,185 psi | 87% | 3074 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 53,795 psi | 88% | 3061 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 51,561 psi | 85% | 3041 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,809 psi | 88% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,258 psi | 87% | 3150 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 59% | 1919 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,027 psi | 90% | 3061 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,099 psi | 89% | 3035 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,867 psi | 88% | 3035 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,316 psi | 88% | 3012 fps | 98.5% |
| IMR 4350 | <<locked>> | 94% | 52,649 psi | 86% | 3045 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,766 psi | 88% | 3048 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 54,505 psi | 89% | 3107 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 53,098 psi | 87% | 3074 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 53,243 psi | 87% | 3018 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 52,402 psi | 86% | 2972 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 53,708 psi | 88% | 3025 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,359 psi | 88% | 3038 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 54,404 psi | 89% | 3077 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,508 psi | 65% | 2822 fps | 96.5% |
| Norma 201 | <<locked>> | 82% | 51,706 psi | 85% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 82% | 52,576 psi | 86% | 2989 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,462 psi | 89% | 3084 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,214 psi | 87% | 3094 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 51,140 psi | 84% | 3169 fps | 98.3% |
| Norma URP | <<locked>> | 94% | 52,953 psi | 87% | 3104 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 84% | 51,590 psi | 85% | 3054 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 51,895 psi | 85% | 3100 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,405 psi | 60% | 1965 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 52,808 psi | 87% | 3035 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 52,330 psi | 86% | 3114 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 52,185 psi | 86% | 3150 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,041 psi | 89% | 3143 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,939 psi | 87% | 3173 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 52,373 psi | 86% | 2989 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 51,982 psi | 85% | 3031 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 53,925 psi | 89% | 3071 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,592 psi | 88% | 3123 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 51,750 psi | 85% | 3009 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,359 psi | 88% | 3038 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 53,243 psi | 87% | 3018 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,708 psi | 88% | 3025 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,404 psi | 89% | 3077 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,679 psi | 88% | 3094 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,346 psi | 89% | 3051 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,100 psi | 90% | 3071 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,924 psi | 87% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,766 psi | 88% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,142 psi | 87% | 2986 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,098 psi | 87% | 3120 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 52,460 psi | 86% | 2917 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,099 psi | 89% | 3038 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 52,257 psi | 86% | 3028 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 51,706 psi | 85% | 3104 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,331 psi | 89% | 3100 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 53,417 psi | 88% | 2907 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 52,678 psi | 86% | 2953 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,142 psi | 87% | 2966 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,650 psi | 88% | 3005 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 51,808 psi | 85% | 3041 fps | 99.7% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,775 psi | 77% | 2953 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 86% | 54,824 psi | 90% | 3012 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,317 psi | 89% | 3104 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,415 psi | 83% | 3097 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 51,706 psi | 85% | 3015 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,287 psi | 87% | 3117 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,727 psi | 67% | 3058 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 51,576 psi | 85% | 3022 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,024 psi | 84% | 3035 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% | 46,296 psi | 76% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,208 psi | 74% | 2848 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 36,129 psi | 59% | 2746 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 43,859 psi | 72% | 2858 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,779 psi | 54% | 2680 fps | 96% |
| Accurate High Country | <<locked>> | 98% | 49,066 psi | 81% | 3130 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 49,893 psi | 82% | 2992 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,293 psi | 69% | 2831 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 45,556 psi | 75% | 2972 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,180 psi | 76% | 3048 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,527 psi | 75% | 2972 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,308 psi | 69% | 2854 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,397 psi | 75% | 2927 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,735 psi | 54% | 2700 fps | 96.1% |
| Alliant Reloder-17 | 63 gr | 80% | 36,854 psi | 61% | 2835 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 44,904 psi | 74% | 2963 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,933 psi | 74% | 3012 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,674 psi | 47% | 2602 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 96% | 34,780 psi | 57% | 2785 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,098 psi | 54% | 2792 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,676 psi | 82% | 3005 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 42,163 psi | 69% | 2858 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 44,933 psi | 74% | 3012 fps | 95.4% |
| Bofors RP7 | <<locked>> | 84% | 42,772 psi | 70% | 2835 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 42,917 psi | 70% | 2871 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 40,292 psi | 66% | 2861 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 84% | 43,758 psi | 72% | 2894 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 50,415 psi | 83% | 3002 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,110 psi | 49% | 2589 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,949 psi | 77% | 2979 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 42,685 psi | 70% | 2943 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,600 psi | 44% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,312 psi | 79% | 2953 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,763 psi | 83% | 2986 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,411 psi | 73% | 2867 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,934 psi | 77% | 2894 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 40,640 psi | 67% | 2808 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,233 psi | 64% | 2756 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 31,792 psi | 52% | 2638 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 46,572 psi | 76% | 2959 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 49,574 psi | 81% | 2963 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,385 psi | 81% | 2920 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,556 psi | 73% | 2867 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,506 psi | 60% | 2700 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 39,494 psi | 65% | 2789 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 36,985 psi | 61% | 2766 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 48,631 psi | 80% | 2933 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,240 psi | 81% | 2936 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,773 psi | 74% | 2913 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 46,325 psi | 76% | 2969 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 41,365 psi | 68% | 2966 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,011 psi | 54% | 2684 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 44,860 psi | 74% | 2933 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 36,796 psi | 60% | 2789 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 44% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,178 psi | 71% | 2851 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,646 psi | 80% | 3045 fps | 99.8% |
| ReloadSwiss RS 60 | 63 gr | 80% | 39,262 psi | 64% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,663 psi | 54% | 2700 fps | 95.5% |
| ReloadSwiss RS 70 | 65.6 gr | 82% | 34,635 psi | 57% | 2769 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 46,166 psi | 76% | 2881 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,610 psi | 65% | 2799 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 96% | 50,459 psi | 83% | 3012 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 43,816 psi | 72% | 2940 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 42,772 psi | 70% | 2835 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,506 psi | 60% | 2700 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,574 psi | 81% | 2963 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,556 psi | 73% | 2867 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 39,494 psi | 65% | 2789 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,886 psi | 67% | 2858 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,662 psi | 83% | 2986 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,298 psi | 79% | 2956 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,690 psi | 82% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,698 psi | 68% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,785 psi | 67% | 2753 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,456 psi | 76% | 2999 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 49,472 psi | 81% | 2871 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,517 psi | 83% | 2979 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,350 psi | 66% | 2805 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 29,631 psi | 49% | 2635 fps | 98.1% |
| Somchem S385 | <<locked>> | 92% | 41,437 psi | 68% | 2858 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 50,227 psi | 82% | 2858 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,166 psi | 76% | 2851 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,644 psi | 77% | 2864 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,392 psi | 63% | 2733 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 34,490 psi | 57% | 2690 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 98% | 43,729 psi | 72% | 2894 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 45,063 psi | 74% | 2854 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,982 psi | 56% | 2687 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 29,211 psi | 48% | 2621 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,055 psi | 56% | 2664 fps | 98.5% |
| Winchester 760 | <<locked>> | 84% | 40,495 psi | 66% | 2867 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,919 psi | 44% | 2625 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,095 psi | 79% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,543 psi | 78% | 2969 fps | 95.8% |
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 | 155.8gr | Peregrine Glider (Glider GRM). Alliant Reloder-26 delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,215 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 156.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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 | 155.8gr | 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.