Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 181gr | RWS H-Mantel bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country 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>> | 98% | 55,114 psi | 90% | 2917 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 53,388 psi | 88% | 2904 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 52,678 psi | 86% | 3005 fps | 98% |
| Accurate MAGPRO | <<locked>> | 96% | 53,635 psi | 88% | 3005 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 52,243 psi | 86% | 2822 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,317 psi | 89% | 2956 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 51,895 psi | 85% | 2949 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,305 psi | 63% | 2730 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 53,142 psi | 87% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,070 psi | 89% | 2959 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 51,634 psi | 85% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 53,809 psi | 88% | 2946 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,998 psi | 90% | 3009 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 52,141 psi | 86% | 2930 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,240 psi | 79% | 2923 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 51,996 psi | 85% | 3015 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,940 psi | 89% | 2989 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 54,099 psi | 89% | 2864 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,077 psi | 72% | 2848 fps | 96.5% |
| Bofors RP5 | <<locked>> | 98% | 54,998 psi | 90% | 3009 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 53,200 psi | 87% | 2851 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,747 psi | 78% | 2867 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 82% | 54,099 psi | 89% | 2881 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 51,837 psi | 85% | 2904 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 54,882 psi | 90% | 2917 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 51,967 psi | 85% | 2890 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,462 psi | 89% | 2933 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,563 psi | 90% | 2884 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,137 psi | 77% | 2969 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 86% | 51,692 psi | 85% | 2933 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,753 psi | 60% | 1811 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,027 psi | 90% | 2854 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,491 psi | 89% | 2890 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,897 psi | 90% | 2881 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 53,867 psi | 88% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 53,664 psi | 88% | 2884 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 98% | 53,156 psi | 87% | 2986 fps | 97.9% |
| Lovex S065 | <<locked>> | 88% | 55,056 psi | 90% | 2877 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 53,214 psi | 87% | 2871 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,168 psi | 81% | 2825 fps | 99.7% |
| Norma 204 | <<locked>> | 88% | 51,517 psi | 85% | 2884 fps | 98.3% |
| Norma MRP | <<locked>> | 96% | 54,491 psi | 89% | 3028 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 52,199 psi | 86% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 53,534 psi | 88% | 3002 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 54,317 psi | 89% | 2946 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,561 psi | 85% | 2936 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,463 psi | 62% | 1854 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,983 psi | 89% | 2864 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,795 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 53,345 psi | 88% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 51,677 psi | 85% | 2956 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,398 psi | 78% | 2969 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 84% | 54,186 psi | 89% | 2861 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 52,373 psi | 86% | 2867 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 94% | 53,011 psi | 87% | 2930 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 53,200 psi | 87% | 2851 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,056 psi | 90% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 53,214 psi | 87% | 2871 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 52,069 psi | 85% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,795 psi | 90% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,694 psi | 90% | 2831 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 52,562 psi | 86% | 2923 fps | 98.8% |
| Somchem S355 | <<locked>> | 84% | 54,041 psi | 89% | 2854 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,766 psi | 88% | 2858 fps | 97.2% |
| Somchem S365 | <<locked>> | 90% | 51,837 psi | 85% | 2894 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 53,563 psi | 88% | 2904 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 51,851 psi | 85% | 2779 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 53,998 psi | 89% | 2884 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 52,895 psi | 87% | 2877 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 88% | 53,214 psi | 87% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,462 psi | 89% | 2956 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,621 psi | 90% | 3022 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,357 psi | 83% | 2933 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 53,447 psi | 88% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 52,040 psi | 85% | 2907 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,779 psi | 85% | 3058 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 53,563 psi | 88% | 2897 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% | 29,994 psi | 49% | 2418 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 40,625 psi | 67% | 2680 fps | 99.5% |
| Accurate High Country | 71.1 gr | 88% | 42,801 psi | 70% | 2818 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 92% | 46,514 psi | 76% | 2877 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 49,139 psi | 81% | 2772 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,131 psi | 64% | 2664 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 92% | 45,426 psi | 75% | 2825 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 96% | 33,765 psi | 55% | 2605 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,937 psi | 82% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,189 psi | 64% | 2690 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,686 psi | 73% | 2812 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,870 psi | 64% | 2657 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 39,175 psi | 64% | 2710 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,979 psi | 48% | 2451 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,777 psi | 51% | 2516 fps | 95.9% |
| Alliant Reloder-26 | 66.6 gr | 80% | 31,140 psi | 51% | 2572 fps | 97% |
| Bofors RP15 | <<locked>> | 90% | 38,841 psi | 64% | 2700 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,575 psi | 83% | 2808 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,147 psi | 68% | 2785 fps | 95.6% |
| Bofors RP5 | <<locked>> | 88% | 39,175 psi | 64% | 2710 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 44,222 psi | 73% | 2690 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 41,597 psi | 68% | 2740 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 50,836 psi | 83% | 2828 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,395 psi | 70% | 2726 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 45,266 psi | 74% | 2746 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 45,484 psi | 75% | 2776 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,527 psi | 73% | 2756 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,811 psi | 60% | 2579 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,405 psi | 60% | 2713 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 41,307 psi | 68% | 2743 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,514 psi | 45% | 1617 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,721 psi | 85% | 2805 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 39,784 psi | 65% | 2618 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,571 psi | 75% | 2720 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 38,885 psi | 64% | 2631 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,338 psi | 73% | 2713 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 92% | 43,410 psi | 71% | 2799 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 43,163 psi | 71% | 2671 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 41,321 psi | 68% | 2651 fps | 98% |
| Lovex S071 | <<locked>> | 86% | 31,328 psi | 51% | 2454 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 39,276 psi | 64% | 2648 fps | 95.3% |
| Norma MRP | 66.2 gr | 82% | 33,460 psi | 55% | 2598 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 40,074 psi | 66% | 2671 fps | 99.4% |
| Ramshot Grand | <<locked>> | 92% | 43,221 psi | 71% | 2808 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 38,899 psi | 64% | 2661 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 35,766 psi | 59% | 2618 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 46% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,575 psi | 83% | 2808 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,442 psi | 78% | 2858 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,451 psi | 66% | 2700 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,030 psi | 64% | 2713 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,636 psi | 59% | 2694 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 47,529 psi | 78% | 2756 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,207 psi | 71% | 2700 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 38,043 psi | 62% | 2641 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,222 psi | 73% | 2690 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,163 psi | 71% | 2671 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 41,321 psi | 68% | 2651 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,747 psi | 80% | 2812 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,515 psi | 80% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,250 psi | 69% | 2615 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,695 psi | 62% | 2635 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 47,776 psi | 78% | 2756 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 47,282 psi | 78% | 2746 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 36,825 psi | 60% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,303 psi | 60% | 2572 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 45,542 psi | 75% | 2680 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,553 psi | 68% | 2667 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 35,737 psi | 59% | 2552 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 41,060 psi | 67% | 2674 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,227 psi | 53% | 2526 fps | 98.2% |
| Vihtavuori N560 | <<locked>> | 90% | 44,541 psi | 73% | 2838 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 96% | 43,874 psi | 72% | 2812 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,553 psi | 67% | 2635 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,540 psi | 70% | 2730 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,585 psi | 42% | 2434 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,927 psi | 62% | 2605 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 83 powders for .300 Blaser Mag. loaded with the .308 | 181gr | RWS H-Mantel. Winchester StaBALL HD delivers the highest muzzle velocity at 3,058 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,058 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 181.0 gr projectile in 0.308" calls for a 1:14.0 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for .300 Blaser Mag. with the .308 | 181gr | RWS H-Mantel they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, IMR 8133 Enduron, Norma 217 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.