Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 200gr | Speer Grand Slam 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% | 52,924 psi | 87% | 2756 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,447 psi | 89% | 2785 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 54,288 psi | 89% | 2904 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 94% | 55,056 psi | 90% | 2904 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 51,576 psi | 85% | 2785 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 52,837 psi | 87% | 2844 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,253 psi | 78% | 2743 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,047 psi | 69% | 2710 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 51,895 psi | 85% | 2785 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 86% | 51,967 psi | 85% | 2792 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 52,649 psi | 86% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,810 psi | 90% | 2835 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 52,765 psi | 87% | 2841 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 53,708 psi | 88% | 2815 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,924 psi | 87% | 2871 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 53,867 psi | 88% | 2900 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 54,897 psi | 90% | 2808 fps | 96.4% |
| Bofors RP15 | <<locked>> | 96% | 51,996 psi | 85% | 2828 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,095 psi | 81% | 2818 fps | 98.7% |
| Bofors RP5 | <<locked>> | 94% | 52,765 psi | 87% | 2841 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 53,780 psi | 88% | 2736 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,040 psi | 85% | 2828 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 52,750 psi | 87% | 2789 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 51,996 psi | 85% | 2743 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 52,881 psi | 87% | 2785 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 51,764 psi | 85% | 2766 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 52,098 psi | 86% | 2713 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,982 psi | 85% | 2943 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 52,533 psi | 86% | 2818 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,956 psi | 61% | 1729 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,071 psi | 90% | 2776 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 51,735 psi | 85% | 2703 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 54,824 psi | 90% | 2779 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,259 psi | 89% | 2772 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 54,317 psi | 89% | 2881 fps | 99% |
| Lovex S065 | <<locked>> | 84% | 52,301 psi | 86% | 2707 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 53,853 psi | 88% | 2753 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,085 psi | 89% | 2772 fps | 100% |
| Norma 204 | <<locked>> | 86% | 52,344 psi | 86% | 2772 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 37,623 psi | 62% | 2638 fps | 97.9% |
| Norma MRP | <<locked>> | 92% | 52,475 psi | 86% | 2864 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 53,113 psi | 87% | 2772 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,998 psi | 90% | 2904 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 51,895 psi | 85% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 52,924 psi | 87% | 2835 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,753 psi | 62% | 1768 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,433 psi | 89% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 52,678 psi | 86% | 2838 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,417 psi | 86% | 2940 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 47,181 psi | 77% | 2822 fps | 97% |
| Rottweil R 903 | <<locked>> | 82% | 54,853 psi | 90% | 2733 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 53,026 psi | 87% | 2756 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 54,157 psi | 89% | 2822 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 53,780 psi | 88% | 2736 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 52,301 psi | 86% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 53,853 psi | 88% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,027 psi | 90% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,071 psi | 90% | 2713 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 53,722 psi | 88% | 2815 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 54,549 psi | 90% | 2726 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,505 psi | 89% | 2753 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 53,214 psi | 87% | 2772 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,607 psi | 90% | 2792 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 52,301 psi | 86% | 2654 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,824 psi | 90% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,244 psi | 89% | 2776 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 54,070 psi | 89% | 2769 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 52,794 psi | 87% | 2792 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 52,460 psi | 86% | 2858 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 98% | 52,083 psi | 86% | 2838 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 48,704 psi | 80% | 2831 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,186 psi | 89% | 2723 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 52,750 psi | 87% | 2789 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,723 psi | 90% | 2946 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,578 psi | 90% | 2789 fps | 99.5% |
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% | 33,170 psi | 54% | 2388 fps | 97.5% |
| Accurate 4350 | <<locked>> | 80% | 44,599 psi | 73% | 2631 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 38,334 psi | 63% | 2602 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 86% | 41,553 psi | 68% | 2661 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 37,130 psi | 61% | 2507 fps | 96.1% |
| ADI AR 2213 | <<locked>> | 86% | 40,408 psi | 66% | 2608 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 38,783 psi | 64% | 2569 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 30,603 psi | 50% | 2418 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,579 psi | 62% | 2513 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,554 psi | 70% | 2631 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,139 psi | 81% | 2746 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,231 psi | 61% | 2507 fps | 96.2% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,302 psi | 58% | 2503 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,763 psi | 52% | 2415 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,746 psi | 46% | 2326 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,461 psi | 57% | 2546 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 51,706 psi | 85% | 2753 fps | 95.7% |
| Bofors RP15 | <<locked>> | 84% | 35,157 psi | 58% | 2500 fps | 95.5% |
| Bofors RP30 | <<locked>> | 92% | 37,507 psi | 62% | 2589 fps | 95.7% |
| Bofors RP5 | <<locked>> | 82% | 35,302 psi | 58% | 2503 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 47,355 psi | 78% | 2631 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 37,188 psi | 61% | 2536 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 46,166 psi | 76% | 2677 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 48,689 psi | 80% | 2690 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 40,437 psi | 66% | 2559 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,366 psi | 70% | 2598 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,190 psi | 66% | 2523 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 32,924 psi | 54% | 2516 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 45,426 psi | 75% | 2700 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 46% | 1545 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,830 psi | 70% | 2566 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,704 psi | 80% | 2654 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 42,482 psi | 70% | 2579 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 39,726 psi | 65% | 2507 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 86% | 38,870 psi | 64% | 2589 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 46,325 psi | 76% | 2608 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 44,686 psi | 73% | 2598 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 28,572 psi | 47% | 2270 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 42,757 psi | 70% | 2605 fps | 97.6% |
| Norma 217 | <<locked>> | 94% | 30,922 psi | 51% | 2461 fps | 95% |
| Norma MRP | 64.8 gr | 80% | 34,461 psi | 57% | 2513 fps | 96.9% |
| Norma URP | <<locked>> | 80% | 43,714 psi | 72% | 2618 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 38,406 psi | 63% | 2592 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 42,540 psi | 70% | 2615 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 31,937 psi | 52% | 2418 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,326 psi | 47% | 1581 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,280 psi | 73% | 2648 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,540 psi | 70% | 2667 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 31,937 psi | 52% | 2490 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 40,814 psi | 67% | 2690 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 51,517 psi | 85% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 38,624 psi | 63% | 2490 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 36,477 psi | 60% | 2490 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 80% | 47,355 psi | 78% | 2631 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,325 psi | 76% | 2608 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 44,686 psi | 73% | 2598 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,706 psi | 85% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,324 psi | 74% | 2559 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,143 psi | 59% | 2487 fps | 96% |
| Somchem S355 | <<locked>> | 80% | 51,300 psi | 84% | 2680 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 41,887 psi | 69% | 2533 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 40,567 psi | 67% | 2575 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,985 psi | 61% | 2474 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 80% | 49,153 psi | 81% | 2608 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,208 psi | 74% | 2612 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 32,082 psi | 53% | 2356 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 44,469 psi | 73% | 2615 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 35,592 psi | 58% | 2487 fps | 99.6% |
| Vihtavuori N560 | 68 gr | 84% | 39,827 psi | 65% | 2618 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 39,668 psi | 65% | 2608 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 98% | 45,252 psi | 74% | 2766 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,106 psi | 72% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,166 psi | 76% | 2677 fps | 99.4% |
| Winchester StaBALL HD | 64.1 gr | 80% | 28,210 psi | 46% | 2431 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 36,187 psi | 59% | 2457 fps | 95.9% |
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 | 200gr | Speer Grand Slam. Winchester StaBALL HD delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,946 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 200.0 gr projectile in 0.308" calls for a 1:14.5 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for .300 Blaser Mag. with the .308 | 200gr | Speer Grand Slam 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.