Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 230gr | Sierra MatchKing bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Accurate High Country and Ramshot Grand.
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% | 54,650 psi | 90% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 52,533 psi | 86% | 2552 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 52,301 psi | 86% | 2671 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 53,069 psi | 87% | 2674 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 90% | 53,301 psi | 88% | 2612 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 94% | 54,418 psi | 89% | 2671 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,733 psi | 80% | 2582 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,468 psi | 71% | 2556 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 53,664 psi | 88% | 2605 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,462 psi | 89% | 2615 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 52,823 psi | 87% | 2602 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,433 psi | 89% | 2667 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 52,141 psi | 86% | 2589 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,810 psi | 90% | 2694 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 51,822 psi | 85% | 2667 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 52,779 psi | 87% | 2585 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 53,635 psi | 88% | 2654 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,879 psi | 84% | 2651 fps | 99.5% |
| Bofors RP5 | <<locked>> | 94% | 54,433 psi | 89% | 2667 fps | 99.9% |
| Bofors RP7 | <<locked>> | 84% | 55,013 psi | 90% | 2552 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,809 psi | 88% | 2661 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 54,244 psi | 89% | 2605 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 53,330 psi | 88% | 2566 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 92% | 54,462 psi | 89% | 2615 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 53,490 psi | 88% | 2598 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 53,737 psi | 88% | 2530 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,780 psi | 88% | 2769 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,389 psi | 89% | 2644 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 61% | 1585 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 53,098 psi | 87% | 2543 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 53,113 psi | 87% | 2526 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 53,098 psi | 87% | 2549 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 52,344 psi | 86% | 2549 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 52,446 psi | 86% | 2654 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 38,972 psi | 64% | 2467 fps | 97.3% |
| Lovex S065 | <<locked>> | 84% | 53,693 psi | 88% | 2523 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 52,040 psi | 85% | 2526 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 52,228 psi | 86% | 2546 fps | 100% |
| Norma 204 | <<locked>> | 86% | 53,925 psi | 89% | 2598 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 39,059 psi | 64% | 2493 fps | 99.2% |
| Norma MRP | <<locked>> | 92% | 54,172 psi | 89% | 2687 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,665 psi | 90% | 2585 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 52,779 psi | 87% | 2667 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 53,461 psi | 88% | 2598 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,795 psi | 90% | 2661 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,927 psi | 62% | 1621 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 52,431 psi | 86% | 2579 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,375 psi | 89% | 2654 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,099 psi | 89% | 2766 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,849 psi | 80% | 2664 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 90% | 54,476 psi | 89% | 2582 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 90% | 52,243 psi | 86% | 2592 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 55,013 psi | 90% | 2552 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 53,693 psi | 88% | 2523 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 52,040 psi | 85% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 52,910 psi | 87% | 2487 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 51,822 psi | 85% | 2589 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 52,359 psi | 86% | 2530 fps | 98.8% |
| Somchem S365 | <<locked>> | 88% | 55,114 psi | 90% | 2589 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 52,750 psi | 87% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 53,853 psi | 88% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 52,852 psi | 87% | 2530 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 52,330 psi | 86% | 2552 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 52,025 psi | 85% | 2536 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,563 psi | 90% | 2612 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,085 psi | 89% | 2684 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 98% | 53,621 psi | 88% | 2667 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,386 psi | 83% | 2671 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 52,069 psi | 85% | 2493 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,447 psi | 89% | 2608 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 52,852 psi | 87% | 2710 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 52,591 psi | 86% | 2566 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% | 34,360 psi | 56% | 2247 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 46,050 psi | 76% | 2461 fps | 100% |
| Accurate High Country | 59.7 gr | 80% | 37,115 psi | 61% | 2398 fps | 96.5% |
| Accurate MAGPRO | 62.3 gr | 82% | 37,449 psi | 61% | 2395 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 38,406 psi | 63% | 2359 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 82% | 36,477 psi | 60% | 2349 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 35,143 psi | 58% | 2320 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 86% | 27,891 psi | 46% | 2185 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,121 psi | 72% | 2464 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,821 psi | 83% | 2566 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,421 psi | 63% | 2356 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,200 psi | 56% | 2306 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,895 psi | 54% | 2270 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,776 psi | 47% | 2201 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,940 psi | 59% | 2402 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 46,746 psi | 77% | 2484 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 31,966 psi | 52% | 2254 fps | 95.6% |
| Bofors RP30 | <<locked>> | 88% | 34,011 psi | 56% | 2336 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 34,200 psi | 56% | 2306 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 48,602 psi | 80% | 2457 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 33,678 psi | 55% | 2287 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 47,645 psi | 78% | 2507 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 50,154 psi | 82% | 2516 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 36,506 psi | 60% | 2303 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 82% | 38,232 psi | 63% | 2339 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,611 psi | 68% | 2356 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 29,878 psi | 49% | 2267 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 46,978 psi | 77% | 2533 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 46% | 1414 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,150 psi | 72% | 2405 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,024 psi | 82% | 2480 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 43,743 psi | 72% | 2411 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,348 psi | 63% | 2303 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 35,259 psi | 58% | 2333 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 34,272 psi | 56% | 2362 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 47,529 psi | 78% | 2434 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,006 psi | 76% | 2431 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 29,718 psi | 49% | 2139 fps | 97.5% |
| Norma 204 | <<locked>> | 80% | 43,976 psi | 72% | 2441 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 28,224 psi | 46% | 2231 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 35,766 psi | 59% | 2369 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 45,208 psi | 74% | 2448 fps | 100% |
| Ramshot Grand | 60.6 gr | 82% | 34,563 psi | 57% | 2333 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 43,801 psi | 72% | 2448 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 28,660 psi | 47% | 2172 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,442 psi | 47% | 1447 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,788 psi | 75% | 2480 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,961 psi | 72% | 2500 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 28,848 psi | 47% | 2244 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 39,349 psi | 65% | 2490 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 39,784 psi | 65% | 2339 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 37,623 psi | 62% | 2339 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 48,602 psi | 80% | 2457 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,529 psi | 78% | 2434 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,006 psi | 76% | 2431 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,543 psi | 76% | 2392 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,318 psi | 61% | 2336 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 40,263 psi | 66% | 2329 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 42,177 psi | 69% | 2408 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,261 psi | 63% | 2326 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 50,589 psi | 83% | 2428 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,572 psi | 76% | 2441 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,185 psi | 54% | 2215 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 45,803 psi | 75% | 2444 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,086 psi | 61% | 2336 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 36,013 psi | 59% | 2359 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 35,911 psi | 59% | 2352 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 94% | 40,930 psi | 67% | 2503 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,397 psi | 75% | 2402 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,645 psi | 78% | 2507 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,196 psi | 48% | 2300 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,882 psi | 57% | 2260 fps | 96.7% |
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 72 powders for .300 Blaser Mag. loaded with the .308 | 230gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 2,769 fps; across all powders the maximum-charge window runs from 1,585 fps to 2,769 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 230.0 gr projectile in 0.308" calls for a 1:10.5 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 MAGPRO, Accurate High Country, Ramshot Grand rank at the top here: for .300 Blaser Mag. with the .308 | 230gr | Sierra MatchKing 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.