Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 185gr | Lapua Mega bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Alliant Reloder-26 and Accurate MAGPRO.
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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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 54,056 psi | 89% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 52,156 psi | 86% | 2861 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 51,619 psi | 85% | 2966 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 94% | 52,446 psi | 86% | 2966 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 53,925 psi | 89% | 2825 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 52,823 psi | 87% | 2910 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 54,114 psi | 89% | 2966 fps | 98.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,266 psi | 74% | 2799 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,147 psi | 66% | 2756 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 53,084 psi | 87% | 2907 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,955 psi | 90% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 52,823 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 53,853 psi | 88% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 52,417 psi | 86% | 2900 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 53,766 psi | 88% | 2966 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,766 psi | 90% | 2940 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,444 psi | 83% | 2940 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,013 psi | 90% | 3031 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 52,750 psi | 87% | 2949 fps | 99% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,325 psi | 76% | 2871 fps | 97.5% |
| Bofors RP5 | <<locked>> | 96% | 53,766 psi | 88% | 2966 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 55,071 psi | 90% | 2861 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,763 psi | 82% | 2887 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 86% | 53,853 psi | 88% | 2913 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 53,301 psi | 88% | 2871 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 54,244 psi | 89% | 2910 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 53,098 psi | 87% | 2890 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 53,243 psi | 87% | 2838 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,501 psi | 81% | 2999 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 53,925 psi | 89% | 2946 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 60% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 53,084 psi | 87% | 2848 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 53,258 psi | 87% | 2835 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 52,576 psi | 86% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 52,156 psi | 86% | 2838 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 96% | 51,837 psi | 85% | 2943 fps | 98% |
| Lovex S065 | <<locked>> | 86% | 53,693 psi | 88% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 51,721 psi | 85% | 2825 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,372 psi | 84% | 2835 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 53,621 psi | 88% | 2897 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 35,563 psi | 58% | 2674 fps | 96.2% |
| Norma MRP | <<locked>> | 94% | 53,403 psi | 88% | 2986 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 54,259 psi | 89% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 52,185 psi | 86% | 2959 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 88% | 53,026 psi | 87% | 2900 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,128 psi | 89% | 2956 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,536 psi | 62% | 1841 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 53,388 psi | 88% | 2920 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 51,938 psi | 85% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 53,882 psi | 88% | 2966 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,647 psi | 82% | 2992 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 52,736 psi | 87% | 2815 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,360 psi | 89% | 2881 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 92% | 51,909 psi | 85% | 2890 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 55,071 psi | 90% | 2861 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 53,693 psi | 88% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 51,721 psi | 85% | 2825 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,056 psi | 89% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 53,156 psi | 87% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 52,968 psi | 87% | 2782 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,824 psi | 90% | 2940 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 52,605 psi | 86% | 2808 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 52,388 psi | 86% | 2818 fps | 97.3% |
| Somchem S365 | <<locked>> | 90% | 54,128 psi | 89% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 52,373 psi | 86% | 2861 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 53,780 psi | 88% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 52,692 psi | 87% | 2838 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 51,866 psi | 85% | 2841 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 86% | 51,735 psi | 85% | 2841 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 53,505 psi | 88% | 2913 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 53,388 psi | 88% | 2979 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,924 psi | 87% | 2956 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 51,837 psi | 85% | 2799 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,027 psi | 89% | 2917 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 51,227 psi | 84% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 52,185 psi | 86% | 2854 fps | 98.8% |
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 3100 | <<locked>> | 80% | 31,415 psi | 52% | 2434 fps | 96.1% |
| Accurate 4350 | <<locked>> | 80% | 42,409 psi | 70% | 2694 fps | 99.8% |
| Accurate High Country | 70.9 gr | 86% | 41,771 psi | 69% | 2772 fps | 95.7% |
| Accurate MAGPRO | 75.6 gr | 90% | 45,455 psi | 75% | 2835 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 50,778 psi | 83% | 2776 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 37,942 psi | 62% | 2618 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 41,394 psi | 68% | 2723 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 98% | 42,279 psi | 69% | 2733 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 94% | 33,127 psi | 54% | 2572 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 38,305 psi | 63% | 2621 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,721 psi | 85% | 2799 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,843 psi | 67% | 2700 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,760 psi | 77% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 37,942 psi | 62% | 2615 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 84% | 35,926 psi | 59% | 2612 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,182 psi | 50% | 2464 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,110 psi | 49% | 2480 fps | 96.1% |
| Alliant Reloder-26 | 68 gr | 80% | 32,692 psi | 54% | 2592 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 38,087 psi | 63% | 2661 fps | 95.6% |
| Bofors RP30 | <<locked>> | 96% | 40,596 psi | 67% | 2749 fps | 95.8% |
| Bofors RP5 | <<locked>> | 84% | 35,926 psi | 59% | 2612 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 45,774 psi | 75% | 2700 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 40,625 psi | 67% | 2700 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 44,208 psi | 73% | 2743 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 46,862 psi | 77% | 2756 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 44,338 psi | 73% | 2733 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 43,410 psi | 71% | 2713 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,479 psi | 63% | 2589 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 35,650 psi | 59% | 2677 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 43,294 psi | 71% | 2759 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 45% | 1608 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,249 psi | 68% | 2631 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,079 psi | 77% | 2726 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 40,480 psi | 66% | 2641 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,250 psi | 71% | 2674 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 42,337 psi | 70% | 2756 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 44,527 psi | 73% | 2674 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 42,815 psi | 70% | 2664 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 30,879 psi | 51% | 2418 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 40,930 psi | 67% | 2664 fps | 96.3% |
| Norma 217 | <<locked>> | 98% | 33,373 psi | 55% | 2615 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 32,764 psi | 54% | 2559 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 41,756 psi | 69% | 2680 fps | 99.7% |
| Ramshot Grand | <<locked>> | 90% | 42,119 psi | 69% | 2766 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 40,669 psi | 67% | 2677 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 34,954 psi | 57% | 2582 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 46% | 1647 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,603 psi | 81% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,163 psi | 69% | 2710 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,524 psi | 67% | 2726 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 34,838 psi | 57% | 2654 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 49,371 psi | 81% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,003 psi | 69% | 2654 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 37,144 psi | 61% | 2598 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 45,774 psi | 75% | 2700 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,527 psi | 73% | 2674 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 42,815 psi | 70% | 2664 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,676 psi | 83% | 2818 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,966 psi | 82% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,700 psi | 72% | 2625 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 36,796 psi | 60% | 2592 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 49,313 psi | 81% | 2756 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 45,890 psi | 75% | 2703 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 38,609 psi | 63% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,331 psi | 58% | 2526 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 47,181 psi | 77% | 2684 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,207 psi | 71% | 2677 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 34,882 psi | 57% | 2510 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 42,656 psi | 70% | 2684 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 33,852 psi | 56% | 2543 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 88% | 43,555 psi | 72% | 2795 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 94% | 43,091 psi | 71% | 2776 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,163 psi | 69% | 2641 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,208 psi | 73% | 2743 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,818 psi | 44% | 2467 fps | 98.8% |
| Winchester Supreme 780 | <<locked>> | 84% | 36,941 psi | 61% | 2566 fps | 95.2% |
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 76 powders for .300 Blaser Mag. loaded with the .308 | 185gr | Lapua Mega. Alliant Reloder-26 delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,801 fps to 3,031 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 185.0 gr projectile in 0.308" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Accurate High Country, Alliant Reloder-26, Accurate MAGPRO rank at the top here: for .300 Blaser Mag. with the .308 | 185gr | Lapua Mega 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.