Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 220gr | Sako Hammerhead bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Winchester StaBALL HD.
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>> | 92% | 52,054 psi | 85% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 53,505 psi | 88% | 2638 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,215 psi | 89% | 2762 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 90% | 54,041 psi | 89% | 2694 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 51,692 psi | 85% | 2700 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,632 psi | 81% | 2667 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,222 psi | 73% | 2635 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,404 psi | 89% | 2687 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 53,708 psi | 88% | 2687 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 51,793 psi | 85% | 2697 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 53,243 psi | 87% | 2671 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 52,301 psi | 86% | 2730 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,185 psi | 87% | 2756 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,519 psi | 88% | 2667 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 54,462 psi | 89% | 2736 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,866 psi | 85% | 2733 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 51,793 psi | 85% | 2697 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 52,330 psi | 86% | 2585 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,578 psi | 90% | 2743 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 54,969 psi | 90% | 2687 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,027 psi | 89% | 2644 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 51,851 psi | 85% | 2644 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,172 psi | 89% | 2680 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,563 psi | 90% | 2612 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,752 psi | 90% | 2854 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 51,430 psi | 84% | 2671 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 61% | 1640 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 53,824 psi | 88% | 2625 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 53,708 psi | 88% | 2605 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 53,911 psi | 89% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 52,982 psi | 87% | 2628 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 53,330 psi | 88% | 2736 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,885 psi | 65% | 2546 fps | 97.3% |
| Lovex S065 | <<locked>> | 84% | 54,447 psi | 89% | 2605 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 52,692 psi | 87% | 2605 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 53,229 psi | 87% | 2628 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,665 psi | 90% | 2680 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 40,001 psi | 66% | 2572 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 51,503 psi | 85% | 2717 fps | 100% |
| Norma URP | <<locked>> | 84% | 52,069 psi | 85% | 2621 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,998 psi | 89% | 2759 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 86% | 54,273 psi | 89% | 2680 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 51,996 psi | 85% | 2694 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 62% | 1680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 53,330 psi | 88% | 2661 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 51,503 psi | 85% | 2687 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 51,430 psi | 84% | 2795 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,198 psi | 82% | 2753 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 88% | 52,069 psi | 85% | 2618 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 53,272 psi | 87% | 2677 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 52,330 psi | 86% | 2585 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,447 psi | 89% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 52,692 psi | 87% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 53,548 psi | 88% | 2562 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 52,852 psi | 87% | 2671 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 53,127 psi | 87% | 2612 fps | 98.8% |
| Somchem S365 | <<locked>> | 86% | 52,286 psi | 86% | 2621 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 53,592 psi | 88% | 2648 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 54,447 psi | 89% | 2549 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 53,751 psi | 88% | 2612 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 53,171 psi | 87% | 2631 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 52,968 psi | 87% | 2621 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 52,141 psi | 86% | 2648 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 51,416 psi | 84% | 2713 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 54,824 psi | 90% | 2753 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,459 psi | 84% | 2756 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 52,895 psi | 87% | 2572 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 51,590 psi | 85% | 2638 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,418 psi | 89% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,447 psi | 88% | 2648 fps | 99.8% |
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% | 34,969 psi | 57% | 2316 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 46,789 psi | 77% | 2539 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 38,218 psi | 63% | 2474 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 38,827 psi | 64% | 2431 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 37,043 psi | 61% | 2421 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 90% | 35,839 psi | 59% | 2395 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 86% | 28,311 psi | 46% | 2251 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,730 psi | 73% | 2543 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,001 psi | 64% | 2428 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,737 psi | 57% | 2379 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,591 psi | 55% | 2343 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,138 psi | 48% | 2264 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,622 psi | 60% | 2477 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 47,500 psi | 78% | 2562 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 32,387 psi | 53% | 2320 fps | 95.5% |
| Bofors RP30 | <<locked>> | 88% | 34,693 psi | 57% | 2411 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 34,737 psi | 57% | 2379 fps | 96.6% |
| Bofors RP7 | <<locked>> | 80% | 49,356 psi | 81% | 2539 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 34,156 psi | 56% | 2356 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,182 psi | 79% | 2585 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 50,749 psi | 83% | 2595 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 36,999 psi | 61% | 2372 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 38,827 psi | 64% | 2411 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,250 psi | 69% | 2431 fps | 100% |
| Hodgdon Retumbo | 62 gr | 82% | 30,385 psi | 50% | 2336 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 47,747 psi | 78% | 2615 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 46% | 1467 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,628 psi | 73% | 2477 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,691 psi | 83% | 2559 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 44,440 psi | 73% | 2487 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,754 psi | 64% | 2375 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 35,665 psi | 59% | 2402 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 34,969 psi | 57% | 2438 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 48,283 psi | 79% | 2513 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,499 psi | 76% | 2507 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 30,153 psi | 50% | 2205 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 44,657 psi | 73% | 2520 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 28,877 psi | 47% | 2300 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 36,347 psi | 60% | 2441 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 45,716 psi | 75% | 2523 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 35,201 psi | 58% | 2405 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 44,454 psi | 73% | 2526 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 29,211 psi | 48% | 2241 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,601 psi | 47% | 1503 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,485 psi | 76% | 2559 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,730 psi | 73% | 2579 fps | 100% |
| ReloadSwiss RS 76 | 66.4 gr | 82% | 29,370 psi | 48% | 2313 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 37,463 psi | 62% | 2507 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 40,263 psi | 66% | 2411 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 38,261 psi | 63% | 2415 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 49,356 psi | 81% | 2539 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,283 psi | 79% | 2513 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,499 psi | 76% | 2507 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,123 psi | 77% | 2467 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,971 psi | 62% | 2408 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 40,872 psi | 67% | 2402 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 42,757 psi | 70% | 2484 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,827 psi | 64% | 2398 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 51,097 psi | 84% | 2503 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,253 psi | 78% | 2520 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,721 psi | 55% | 2283 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 46,543 psi | 76% | 2523 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,652 psi | 62% | 2408 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 36,564 psi | 60% | 2431 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 36,608 psi | 60% | 2425 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 94% | 41,814 psi | 69% | 2582 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,035 psi | 76% | 2477 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,370 psi | 79% | 2589 fps | 99.9% |
| Winchester StaBALL HD | 62.1 gr | 80% | 29,718 psi | 49% | 2369 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,360 psi | 58% | 2329 fps | 96.6% |
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 70 powders for .300 Blaser Mag. loaded with the .308 | 220gr | Sako Hammerhead. Hodgdon Retumbo delivers the highest muzzle velocity at 2,854 fps; across all powders the maximum-charge window runs from 1,640 fps to 2,854 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 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 220.0 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, Bofors RP30 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. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .300 Blaser Mag. with the .308 | 220gr | Sako Hammerhead 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.