Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 155gr | Merlin Virtus bullet and 90 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 Alliant Reloder-26.
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% | 54,447 psi | 89% | 2995 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 52,982 psi | 87% | 3009 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,763 psi | 82% | 3035 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 54,868 psi | 90% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 52,011 psi | 85% | 3100 fps | 99.9% |
| Accurate High Countryᴾ | <<locked>> | 100% | 54,897 psi | 90% | 3251 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 82% | 54,404 psi | 89% | 3084 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 52,446 psi | 86% | 3038 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,563 psi | 88% | 3143 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,868 psi | 90% | 3222 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 52,924 psi | 87% | 3064 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,098 psi | 87% | 3084 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 53,142 psi | 87% | 3166 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,520 psi | 90% | 3199 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 52,736 psi | 87% | 3127 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,777 psi | 82% | 3120 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,862 psi | 77% | 3061 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,959 psi | 67% | 2966 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,983 psi | 89% | 3268 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,578 psi | 90% | 3107 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 53,476 psi | 88% | 3077 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,777 psi | 82% | 3120 fps | 96.8% |
| Bofors RP7 | <<locked>> | 90% | 53,301 psi | 88% | 3054 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 86% | 54,056 psi | 89% | 3094 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 54,607 psi | 90% | 3159 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 90% | 54,737 psi | 90% | 3120 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 82% | 54,984 psi | 90% | 3097 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,476 psi | 88% | 3087 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 51,721 psi | 85% | 3077 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,984 psi | 90% | 3199 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 59% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 52,736 psi | 87% | 3045 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 51,851 psi | 85% | 3018 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,534 psi | 90% | 3054 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 54,041 psi | 89% | 3084 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,042 psi | 90% | 3087 fps | 98.8% |
| IMR 4831 | <<locked>> | 94% | 52,794 psi | 87% | 3097 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 54,505 psi | 89% | 3114 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,679 psi | 90% | 3058 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,548 psi | 88% | 3009 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,100 psi | 90% | 3064 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,694 psi | 90% | 3077 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 52,533 psi | 86% | 3064 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,075 psi | 67% | 2871 fps | 97.1% |
| Norma 201 | <<locked>> | 82% | 53,171 psi | 87% | 3028 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,824 psi | 88% | 3025 fps | 100% |
| Norma 203B | <<locked>> | 84% | 52,402 psi | 86% | 3068 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,868 psi | 90% | 3143 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 53,084 psi | 87% | 3219 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 54,563 psi | 90% | 3146 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 53,055 psi | 87% | 3094 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 53,519 psi | 88% | 3146 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,506 psi | 60% | 1985 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,114 psi | 89% | 3074 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,838 psi | 88% | 3153 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,896 psi | 88% | 3189 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 52,040 psi | 85% | 3123 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,665 psi | 90% | 3219 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 53,809 psi | 88% | 3028 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,345 psi | 88% | 3068 fps | 100% |
| Rottweil R 905 | <<locked>> | 98% | 51,924 psi | 85% | 3114 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 90% | 53,301 psi | 88% | 3054 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,694 psi | 90% | 3077 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,679 psi | 90% | 3058 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,100 psi | 90% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 52,533 psi | 86% | 3064 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 51,721 psi | 85% | 3077 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 52,997 psi | 87% | 3054 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,201 psi | 89% | 2959 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,114 psi | 90% | 2959 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,563 psi | 90% | 3028 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,013 psi | 90% | 3169 fps | 97.8% |
| Somchem S335 | <<locked>> | 82% | 53,853 psi | 88% | 2953 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,592 psi | 88% | 3068 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 53,679 psi | 88% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 52,562 psi | 86% | 3087 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 82% | 54,723 psi | 90% | 2940 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,070 psi | 89% | 2989 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,534 psi | 90% | 3002 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,100 psi | 90% | 3041 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 53,403 psi | 88% | 3087 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,428 psi | 80% | 2999 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 84% | 52,663 psi | 86% | 2999 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 52,373 psi | 86% | 3087 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,446 psi | 86% | 3146 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,185 psi | 87% | 3051 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,824 psi | 90% | 3163 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,134 psi | 69% | 3104 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,069 psi | 87% | 3061 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,910 psi | 87% | 3084 fps | 97.2% |
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% | 47,485 psi | 78% | 2890 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,369 psi | 76% | 2887 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 34,853 psi | 57% | 2726 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 44,991 psi | 74% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,895 psi | 56% | 2723 fps | 96.5% |
| Accurate High Country | <<locked>> | 96% | 47,355 psi | 78% | 3110 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 51,097 psi | 84% | 3031 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,424 psi | 71% | 2871 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 46,862 psi | 77% | 3018 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,485 psi | 78% | 3091 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,526 psi | 71% | 2894 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,586 psi | 76% | 2966 fps | 99.7% |
| Alliant Reloder-16 | 60.4 gr | 80% | 33,736 psi | 55% | 2743 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,000 psi | 62% | 2881 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,224 psi | 76% | 3005 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,468 psi | 71% | 2995 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,717 psi | 46% | 2582 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,940 psi | 59% | 2835 fps | 96% |
| Alliant Reloder-26 | 71.6 gr | 86% | 31,894 psi | 52% | 2769 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,879 psi | 84% | 3041 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 43,540 psi | 71% | 2904 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 43,468 psi | 71% | 2995 fps | 95.1% |
| Bofors RP7 | <<locked>> | 82% | 41,191 psi | 68% | 2818 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 44,019 psi | 72% | 2907 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 38,827 psi | 64% | 2844 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 84% | 44,947 psi | 74% | 2933 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 51,648 psi | 85% | 3041 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,111 psi | 51% | 2631 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,327 psi | 79% | 3018 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 40,988 psi | 67% | 2920 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 44% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,487 psi | 81% | 2989 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,629 psi | 75% | 2907 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,993 psi | 79% | 2936 fps | 97.7% |
| IMR 4350 | <<locked>> | 86% | 41,916 psi | 69% | 2854 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,205 psi | 66% | 2795 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 32,851 psi | 54% | 2680 fps | 96.2% |
| IMR 4895 | <<locked>> | 80% | 47,790 psi | 78% | 2999 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 51,024 psi | 84% | 3002 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,328 psi | 83% | 2956 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,571 psi | 75% | 2904 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,376 psi | 61% | 2736 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 38,130 psi | 63% | 2772 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 35,824 psi | 59% | 2753 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 49,690 psi | 82% | 2969 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,531 psi | 83% | 2972 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,963 psi | 75% | 2953 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 47,703 psi | 78% | 3012 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 39,842 psi | 65% | 2946 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 34,084 psi | 56% | 2726 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 46,108 psi | 76% | 2972 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 35,491 psi | 58% | 2769 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,195 psi | 45% | 1778 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,367 psi | 73% | 2890 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,169 psi | 82% | 3091 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,480 psi | 66% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,823 psi | 56% | 2743 fps | 96.1% |
| ReloadSwiss RS 70 | 66 gr | 80% | 33,214 psi | 55% | 2743 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 47,413 psi | 78% | 2920 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,828 psi | 67% | 2841 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 94% | 45,223 psi | 74% | 2989 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 82% | 41,191 psi | 68% | 2818 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,376 psi | 61% | 2736 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,024 psi | 84% | 3002 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,571 psi | 75% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,130 psi | 63% | 2772 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,148 psi | 69% | 2897 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,617 psi | 81% | 2995 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,807 psi | 83% | 2907 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,714 psi | 70% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,233 psi | 64% | 2736 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,802 psi | 74% | 2979 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 50,444 psi | 83% | 2904 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,350 psi | 68% | 2841 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,632 psi | 50% | 2677 fps | 98.5% |
| Somchem S385 | <<locked>> | 90% | 40,074 psi | 66% | 2844 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 51,358 psi | 84% | 2894 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,398 psi | 78% | 2887 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,848 psi | 79% | 2900 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,494 psi | 65% | 2772 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,534 psi | 58% | 2730 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 96% | 42,264 psi | 69% | 2877 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 46,151 psi | 76% | 2890 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,940 psi | 57% | 2726 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 30,255 psi | 50% | 2664 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,969 psi | 57% | 2700 fps | 98.8% |
| Winchester 760 | <<locked>> | 82% | 39,015 psi | 64% | 2848 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,034 psi | 43% | 2602 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,603 psi | 81% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,759 psi | 75% | 2956 fps | 95.5% |
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 90 powders for .300 Blaser Mag. loaded with the .308 | 155gr | Merlin Virtus. Alliant Reloder-26 delivers the highest muzzle velocity at 3,268 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,268 fps. Accurate 3100 gives the best case fill at 100 %, and 90 of the 90 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 155.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Alliant Reloder-22 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, Alliant Reloder-26 rank at the top here: for .300 Blaser Mag. with the .308 | 155gr | Merlin Virtus 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.