Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 205gr | Sierra GameKing bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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>> | 94% | 52,808 psi | 87% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,317 psi | 89% | 2746 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 53,998 psi | 89% | 2861 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 54,882 psi | 90% | 2864 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 92% | 55,056 psi | 90% | 2802 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 52,779 psi | 87% | 2808 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,282 psi | 78% | 2710 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,945 psi | 69% | 2674 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 51,909 psi | 85% | 2749 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 51,706 psi | 85% | 2749 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 52,460 psi | 86% | 2759 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,621 psi | 90% | 2795 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 52,634 psi | 86% | 2805 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 53,809 psi | 88% | 2779 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,968 psi | 87% | 2838 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 53,679 psi | 88% | 2864 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 54,824 psi | 90% | 2772 fps | 96.6% |
| Bofors RP15 | <<locked>> | 98% | 55,100 psi | 90% | 2841 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,936 psi | 80% | 2779 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 52,634 psi | 86% | 2805 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 53,548 psi | 88% | 2694 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,938 psi | 85% | 2792 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 52,591 psi | 86% | 2749 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 51,953 psi | 85% | 2707 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 52,750 psi | 87% | 2746 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 51,837 psi | 85% | 2733 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 52,185 psi | 86% | 2677 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,851 psi | 85% | 2904 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 52,605 psi | 86% | 2782 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,028 psi | 61% | 1699 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,984 psi | 90% | 2736 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 51,880 psi | 85% | 2671 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 54,708 psi | 90% | 2740 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,070 psi | 89% | 2733 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 54,273 psi | 89% | 2844 fps | 99.1% |
| Lovex S065 | <<locked>> | 84% | 52,243 psi | 86% | 2667 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 53,664 psi | 88% | 2713 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,737 psi | 88% | 2730 fps | 100% |
| Norma 204 | <<locked>> | 86% | 52,301 psi | 86% | 2736 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 37,492 psi | 62% | 2602 fps | 98% |
| Norma MRP | <<locked>> | 92% | 52,199 psi | 86% | 2825 fps | 100% |
| Norma URP | <<locked>> | 86% | 52,924 psi | 87% | 2730 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,795 psi | 90% | 2864 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 51,808 psi | 85% | 2740 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 52,881 psi | 87% | 2799 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,855 psi | 62% | 1742 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,389 psi | 89% | 2772 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 52,489 psi | 86% | 2799 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,301 psi | 86% | 2900 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 47,036 psi | 77% | 2785 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 82% | 54,766 psi | 90% | 2694 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 52,939 psi | 87% | 2720 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 92% | 54,157 psi | 89% | 2782 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 53,548 psi | 88% | 2694 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 52,243 psi | 86% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 53,664 psi | 88% | 2713 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,853 psi | 90% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,868 psi | 90% | 2674 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 53,722 psi | 88% | 2779 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 54,476 psi | 89% | 2687 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,259 psi | 89% | 2713 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 53,098 psi | 87% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,694 psi | 90% | 2759 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 52,214 psi | 86% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,665 psi | 90% | 2723 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 53,925 psi | 89% | 2736 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 53,983 psi | 89% | 2730 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 52,562 psi | 86% | 2753 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 52,199 psi | 86% | 2818 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 98% | 51,953 psi | 85% | 2802 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 48,457 psi | 80% | 2792 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,041 psi | 89% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 52,823 psi | 87% | 2753 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,563 psi | 90% | 2907 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,317 psi | 89% | 2749 fps | 99.6% |
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 3100 | <<locked>> | 80% | 33,112 psi | 54% | 2356 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 44,454 psi | 73% | 2595 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 38,232 psi | 63% | 2566 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 86% | 41,582 psi | 68% | 2628 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 37,217 psi | 61% | 2477 fps | 96.3% |
| ADI AR 2213 | <<locked>> | 84% | 37,782 psi | 62% | 2516 fps | 95% |
| ADI AR 2217 | <<locked>> | 94% | 38,667 psi | 63% | 2536 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 30,603 psi | 50% | 2392 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,492 psi | 62% | 2480 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,612 psi | 70% | 2598 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,124 psi | 81% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,144 psi | 61% | 2474 fps | 96.4% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,259 psi | 58% | 2470 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,792 psi | 52% | 2385 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,789 psi | 46% | 2297 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,345 psi | 56% | 2513 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 48,530 psi | 80% | 2661 fps | 95% |
| Bofors RP15 | <<locked>> | 84% | 34,998 psi | 57% | 2464 fps | 95.6% |
| Bofors RP30 | <<locked>> | 92% | 37,347 psi | 61% | 2556 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 35,259 psi | 58% | 2470 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 47,442 psi | 78% | 2595 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 90% | 37,057 psi | 61% | 2503 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 46,137 psi | 76% | 2641 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 48,602 psi | 80% | 2651 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 40,292 psi | 66% | 2523 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 84% | 39,610 psi | 65% | 2510 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,190 psi | 66% | 2487 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 32,837 psi | 54% | 2484 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 45,397 psi | 75% | 2664 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 46% | 1519 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,902 psi | 70% | 2533 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,776 psi | 80% | 2621 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 42,366 psi | 70% | 2543 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 39,668 psi | 65% | 2474 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 86% | 38,769 psi | 64% | 2552 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 46,354 psi | 76% | 2572 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 44,541 psi | 73% | 2562 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 28,543 psi | 47% | 2241 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 42,743 psi | 70% | 2569 fps | 97.7% |
| Norma 217 | <<locked>> | 94% | 30,835 psi | 51% | 2431 fps | 95.2% |
| Norma MRP | 63.4 gr | 80% | 34,330 psi | 56% | 2480 fps | 97.1% |
| Norma URP | <<locked>> | 80% | 43,627 psi | 72% | 2582 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 38,363 psi | 63% | 2559 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 42,482 psi | 70% | 2579 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 31,879 psi | 52% | 2388 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 47% | 1555 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,266 psi | 73% | 2615 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,380 psi | 70% | 2628 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 31,850 psi | 52% | 2457 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 40,625 psi | 67% | 2657 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 51,343 psi | 84% | 2648 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 38,493 psi | 63% | 2454 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 36,376 psi | 60% | 2457 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 80% | 47,442 psi | 78% | 2595 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,354 psi | 76% | 2572 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 44,541 psi | 73% | 2562 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,677 psi | 85% | 2530 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,237 psi | 74% | 2523 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,056 psi | 59% | 2451 fps | 96.2% |
| Somchem S355 | <<locked>> | 80% | 51,372 psi | 84% | 2644 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 41,843 psi | 69% | 2500 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 40,640 psi | 67% | 2543 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,912 psi | 61% | 2441 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 49,023 psi | 80% | 2569 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,107 psi | 74% | 2575 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 31,995 psi | 53% | 2323 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 44,425 psi | 73% | 2579 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 35,607 psi | 58% | 2454 fps | 99.7% |
| Vihtavuori N560 | 66.6 gr | 84% | 39,755 psi | 65% | 2585 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 90% | 39,523 psi | 65% | 2572 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 42,148 psi | 69% | 2671 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,990 psi | 72% | 2536 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,137 psi | 76% | 2641 fps | 99.5% |
| Winchester StaBALL HD | 62.8 gr | 80% | 28,181 psi | 46% | 2402 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 33,707 psi | 55% | 2369 fps | 95.1% |
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 75 powders for .300 Blaser Mag. loaded with the .308 | 205gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,907 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 205.0 gr projectile in 0.308" calls for a 1:13.0 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for .300 Blaser Mag. with the .308 | 205gr | Sierra GameKing 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.