Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 172gr | Speer Impact bullet and 87 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 53,156 psi | 87% | 2867 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,752 psi | 90% | 2972 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 52,736 psi | 87% | 2861 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,287 psi | 87% | 2969 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 52,315 psi | 86% | 3061 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 98% | 53,156 psi | 87% | 3058 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 84% | 52,779 psi | 87% | 2894 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,201 psi | 89% | 3012 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 98% | 51,822 psi | 85% | 3002 fps | 96.7% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,302 psi | 89% | 3009 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,476 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,577 psi | 88% | 2936 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,070 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 51,401 psi | 84% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,563 psi | 88% | 2999 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,346 psi | 89% | 3058 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,459 psi | 84% | 2989 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,701 psi | 73% | 2917 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 51,155 psi | 84% | 3068 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,879 psi | 82% | 2979 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 54,172 psi | 89% | 2930 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,346 psi | 89% | 3058 fps | 98.6% |
| Bofors RP7 | <<locked>> | 88% | 53,606 psi | 88% | 2917 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 54,534 psi | 90% | 2946 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 51,851 psi | 85% | 2963 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 86% | 51,619 psi | 85% | 2920 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 96% | 52,069 psi | 85% | 2946 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,389 psi | 89% | 2986 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,418 psi | 89% | 2946 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,729 psi | 72% | 2946 fps | 97% |
| Hodgdon Superformance | <<locked>> | 88% | 51,706 psi | 85% | 2999 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 60% | 1841 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,127 psi | 86% | 2871 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,505 psi | 89% | 2907 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 54,592 psi | 90% | 2949 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,040 psi | 85% | 2890 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 53,664 psi | 88% | 2959 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,940 psi | 90% | 2966 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,708 psi | 88% | 2936 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,011 psi | 87% | 3035 fps | 97.1% |
| Lovex S062 | <<locked>> | 82% | 52,330 psi | 86% | 2867 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 52,083 psi | 86% | 2890 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 53,243 psi | 87% | 2930 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,513 psi | 75% | 2818 fps | 98.9% |
| Norma 203B | <<locked>> | 82% | 52,895 psi | 87% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 90% | 51,750 psi | 85% | 2946 fps | 97.8% |
| Norma MRP | <<locked>> | 98% | 53,954 psi | 89% | 3084 fps | 99.4% |
| Norma URP | <<locked>> | 90% | 51,982 psi | 85% | 2953 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,664 psi | 88% | 2949 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,359 psi | 88% | 3051 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 54,215 psi | 89% | 3005 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,543 psi | 78% | 2920 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,173 psi | 61% | 1886 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,520 psi | 90% | 2933 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,621 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,026 psi | 87% | 2989 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 51,474 psi | 85% | 3015 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,830 psi | 72% | 2943 fps | 98.1% |
| Rottweil R 902 | <<locked>> | 82% | 54,288 psi | 89% | 2877 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,244 psi | 89% | 2927 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 52,504 psi | 86% | 2927 fps | 97% |
| Rottweil R 905 | <<locked>> | 96% | 52,678 psi | 86% | 2982 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 53,606 psi | 88% | 2917 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 52,083 psi | 86% | 2890 fps | 99.7% |
| Shooters World Precision | <<locked>> | 82% | 52,330 psi | 86% | 2867 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,243 psi | 87% | 2930 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 52,330 psi | 86% | 2933 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 52,040 psi | 85% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,998 psi | 90% | 2894 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 52,199 psi | 86% | 2979 fps | 98.2% |
| Somchem S355 | <<locked>> | 86% | 54,230 psi | 89% | 2923 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 53,983 psi | 89% | 2913 fps | 96.5% |
| Somchem S365 | <<locked>> | 94% | 54,897 psi | 90% | 3005 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,476 psi | 88% | 2959 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 54,534 psi | 90% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,708 psi | 90% | 2851 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 52,069 psi | 85% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,128 psi | 89% | 2946 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,663 psi | 86% | 2933 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 53,127 psi | 87% | 2848 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,156 psi | 87% | 2949 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,056 psi | 89% | 3015 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,230 psi | 89% | 3074 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,490 psi | 88% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,083 psi | 86% | 2966 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,557 psi | 76% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,490 psi | 88% | 2953 fps | 98.2% |
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 2700 | <<locked>> | 80% | 49,748 psi | 82% | 2812 fps | 98.2% |
| Accurate 3100 | <<locked>> | 84% | 31,749 psi | 52% | 2516 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 49,458 psi | 81% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,739 psi | 62% | 2677 fps | 98.6% |
| Accurate High Country | 72.6 gr | 92% | 45,353 psi | 74% | 2930 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 96% | 49,487 psi | 81% | 2992 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 46,499 psi | 76% | 2785 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,742 psi | 69% | 2776 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 94% | 45,469 psi | 75% | 2877 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,959 psi | 69% | 2779 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,108 psi | 77% | 2812 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,285 psi | 83% | 2881 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,695 psi | 60% | 2687 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,742 psi | 69% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,495 psi | 68% | 2769 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,597 psi | 68% | 2818 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,006 psi | 44% | 2441 fps | 96.6% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,576 psi | 53% | 2618 fps | 95.8% |
| Alliant Reloder-26 | 66.7 gr | 82% | 30,879 psi | 51% | 2615 fps | 96% |
| Bofors RP15 | <<locked>> | 94% | 41,031 psi | 67% | 2805 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 47,587 psi | 78% | 2825 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,597 psi | 68% | 2818 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 41,771 psi | 69% | 2694 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 80% | 47,790 psi | 78% | 2835 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 39,726 psi | 65% | 2726 fps | 96.7% |
| Hodgdon H4350 | <<locked>> | 80% | 42,670 psi | 70% | 2749 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 94% | 48,544 psi | 80% | 2884 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 47,732 psi | 78% | 2871 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,229 psi | 56% | 2579 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,017 psi | 67% | 2881 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 38,682 psi | 64% | 2736 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 45% | 1647 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,907 psi | 80% | 2818 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,227 psi | 84% | 2851 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 37,463 psi | 62% | 2621 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,163 psi | 71% | 2726 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 36,245 psi | 60% | 2631 fps | 98.3% |
| IMR 4895 | <<locked>> | 80% | 51,576 psi | 85% | 2910 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,398 psi | 78% | 2825 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 46,253 psi | 76% | 2910 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 49,342 psi | 81% | 2818 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,698 psi | 67% | 2674 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 38,885 psi | 64% | 2654 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 33,054 psi | 54% | 2552 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 49,632 psi | 81% | 2867 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,192 psi | 69% | 2762 fps | 95.4% |
| Norma MRP | 67.9 gr | 86% | 35,694 psi | 59% | 2710 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 37,434 psi | 61% | 2671 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 49,951 psi | 82% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,137 psi | 76% | 2917 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 36,419 psi | 60% | 2661 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 94% | 38,218 psi | 63% | 2723 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,775 psi | 46% | 1686 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,732 psi | 78% | 2818 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,353 psi | 73% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,492 psi | 62% | 2697 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,303 psi | 60% | 2700 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,956 psi | 62% | 2799 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 50,952 psi | 84% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,628 psi | 73% | 2766 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,151 psi | 76% | 2808 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 88% | 40,379 psi | 66% | 2749 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 41,771 psi | 69% | 2694 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,698 psi | 67% | 2674 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 49,342 psi | 81% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,885 psi | 64% | 2654 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,876 psi | 75% | 2825 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,919 psi | 75% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,755 psi | 65% | 2615 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,001 psi | 66% | 2743 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 45,020 psi | 74% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,560 psi | 83% | 2858 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 34,011 psi | 56% | 2631 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 38,450 psi | 63% | 2674 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 51,285 psi | 84% | 2789 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,387 psi | 84% | 2802 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,888 psi | 70% | 2694 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,899 psi | 64% | 2671 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 90% | 37,956 psi | 62% | 2654 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 49,719 psi | 82% | 2799 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,363 psi | 63% | 2674 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 29,675 psi | 49% | 2516 fps | 96.7% |
| Vihtavuori N560 | <<locked>> | 94% | 47,456 psi | 78% | 2949 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,029 psi | 62% | 2641 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 39,726 psi | 65% | 2726 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,844 psi | 39% | 2402 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,451 psi | 66% | 2713 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 87 powders for .300 Blaser Mag. loaded with the .308 | 172gr | Speer Impact. Norma MRP delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,084 fps. Accurate 3100 gives the best case fill at 100 %, and 87 of the 87 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 172.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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 | 172gr | Speer Impact 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.