Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 175gr | Sierra Tipped MatchKing bullet and 85 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% | 53,737 psi | 88% | 2854 fps | 98.9% |
| Accurate 3100 | <<locked>> | 98% | 51,677 psi | 85% | 2900 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 53,084 psi | 87% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,809 psi | 88% | 2953 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 52,924 psi | 87% | 3048 fps | 97.6% |
| Accurate MAGPRO | <<locked>> | 98% | 53,751 psi | 88% | 3045 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 53,055 psi | 87% | 2874 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,665 psi | 90% | 2995 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 98% | 52,315 psi | 86% | 2986 fps | 97% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,940 psi | 90% | 2995 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,795 psi | 88% | 2894 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,128 psi | 89% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,534 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 52,127 psi | 86% | 2976 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,070 psi | 89% | 2986 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,940 psi | 90% | 3045 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,025 psi | 85% | 2972 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,165 psi | 74% | 2904 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 51,822 psi | 85% | 3054 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,415 psi | 83% | 2969 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 54,810 psi | 90% | 2913 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,940 psi | 90% | 3045 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 54,172 psi | 89% | 2900 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 82% | 51,532 psi | 85% | 2874 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 52,315 psi | 86% | 2949 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 86% | 52,170 psi | 86% | 2907 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 96% | 52,547 psi | 86% | 2933 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,984 psi | 90% | 2972 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,868 psi | 90% | 2927 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,193 psi | 73% | 2936 fps | 97.4% |
| Hodgdon Superformance | <<locked>> | 88% | 52,243 psi | 86% | 2982 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,521 psi | 60% | 1824 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,663 psi | 86% | 2854 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,013 psi | 90% | 2890 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 55,013 psi | 90% | 2933 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,359 psi | 86% | 2874 fps | 99.1% |
| IMR 4831 | <<locked>> | 92% | 54,360 psi | 89% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,128 psi | 89% | 2923 fps | 96.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,548 psi | 88% | 3022 fps | 97.4% |
| Lovex S062 | <<locked>> | 82% | 52,837 psi | 87% | 2848 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 52,446 psi | 86% | 2871 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 53,867 psi | 88% | 2917 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,963 psi | 75% | 2805 fps | 99% |
| Norma 203B | <<locked>> | 82% | 53,476 psi | 88% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 90% | 52,214 psi | 86% | 2930 fps | 98% |
| Norma MRP | <<locked>> | 98% | 54,607 psi | 90% | 3074 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 52,663 psi | 86% | 2936 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,056 psi | 89% | 2930 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,722 psi | 88% | 3035 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 54,940 psi | 90% | 2995 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,066 psi | 79% | 2910 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,231 psi | 61% | 1867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,853 psi | 90% | 2913 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 51,590 psi | 85% | 2969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,548 psi | 88% | 2972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 52,025 psi | 85% | 3002 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,309 psi | 73% | 2933 fps | 98.4% |
| Rottweil R 902 | <<locked>> | 82% | 54,795 psi | 90% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,882 psi | 90% | 2910 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 52,910 psi | 87% | 2910 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 96% | 53,417 psi | 88% | 2972 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 54,172 psi | 89% | 2900 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 52,446 psi | 86% | 2871 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 52,837 psi | 87% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,867 psi | 88% | 2917 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 52,750 psi | 87% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 52,301 psi | 86% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 51,967 psi | 85% | 2822 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 52,953 psi | 87% | 2966 fps | 98.4% |
| Somchem S355 | <<locked>> | 86% | 54,839 psi | 90% | 2907 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,462 psi | 89% | 2900 fps | 96.7% |
| Somchem S365 | <<locked>> | 92% | 51,822 psi | 85% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,041 psi | 89% | 2946 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 82% | 55,085 psi | 90% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 52,649 psi | 86% | 2828 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,607 psi | 90% | 2930 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,229 psi | 87% | 2920 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 53,461 psi | 88% | 2828 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,809 psi | 88% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,621 psi | 90% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,839 psi | 90% | 3061 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,201 psi | 89% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,547 psi | 86% | 2949 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,181 psi | 77% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,041 psi | 89% | 2940 fps | 98.4% |
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% | 50,256 psi | 83% | 2799 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 32,198 psi | 53% | 2510 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,009 psi | 82% | 2795 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,261 psi | 63% | 2667 fps | 98.8% |
| Accurate High Country | 70.7 gr | 90% | 42,699 psi | 70% | 2854 fps | 95% |
| Accurate MAGPRO | <<locked>> | 96% | 50,038 psi | 82% | 2979 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 46,963 psi | 77% | 2769 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 42,090 psi | 69% | 2759 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 94% | 45,890 psi | 75% | 2867 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,784 psi | 65% | 2710 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,587 psi | 78% | 2795 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,792 psi | 83% | 2867 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,115 psi | 61% | 2677 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,090 psi | 69% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,829 psi | 69% | 2756 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,378 psi | 65% | 2746 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,325 psi | 45% | 2431 fps | 97% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,850 psi | 51% | 2549 fps | 95.1% |
| Alliant Reloder-26 | 64.8 gr | 80% | 29,080 psi | 48% | 2539 fps | 95.2% |
| Bofors RP15 | <<locked>> | 94% | 41,437 psi | 68% | 2792 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 47,921 psi | 79% | 2805 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,378 psi | 65% | 2746 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,018 psi | 69% | 2677 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 80% | 48,298 psi | 79% | 2822 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 40,030 psi | 66% | 2713 fps | 97% |
| Hodgdon H4350 | <<locked>> | 80% | 42,946 psi | 71% | 2733 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 48,979 psi | 80% | 2871 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,138 psi | 79% | 2854 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,635 psi | 57% | 2566 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 38,899 psi | 64% | 2808 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 39,015 psi | 64% | 2723 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 45% | 1631 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,356 psi | 81% | 2805 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,692 psi | 85% | 2838 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 37,666 psi | 62% | 2605 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,410 psi | 71% | 2707 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 36,709 psi | 60% | 2618 fps | 98.5% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,761 psi | 78% | 2812 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 96% | 46,688 psi | 77% | 2894 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 49,588 psi | 81% | 2799 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,133 psi | 68% | 2664 fps | 98.4% |
| Lovex S070 | <<locked>> | 80% | 39,262 psi | 64% | 2641 fps | 96.9% |
| Lovex S071 | <<locked>> | 88% | 31,343 psi | 51% | 2487 fps | 95% |
| Norma 203B | <<locked>> | 80% | 50,169 psi | 82% | 2854 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,525 psi | 70% | 2749 fps | 95.7% |
| Norma MRP | 67.6 gr | 86% | 36,056 psi | 59% | 2700 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 37,898 psi | 62% | 2661 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 50,517 psi | 83% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 43,540 psi | 71% | 2841 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 36,695 psi | 60% | 2644 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 94% | 38,624 psi | 63% | 2717 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 46% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,254 psi | 79% | 2805 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,701 psi | 73% | 2854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,840 psi | 62% | 2680 fps | 98.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,782 psi | 60% | 2694 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 35,868 psi | 59% | 2723 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 51,445 psi | 84% | 2812 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,121 psi | 74% | 2753 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 43,801 psi | 72% | 2743 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 40,915 psi | 67% | 2740 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,018 psi | 69% | 2677 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,133 psi | 68% | 2664 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 49,588 psi | 81% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,262 psi | 64% | 2641 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,224 psi | 76% | 2805 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,325 psi | 76% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,176 psi | 66% | 2605 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,538 psi | 67% | 2733 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 45,498 psi | 75% | 2753 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 47,732 psi | 78% | 2785 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 34,301 psi | 56% | 2615 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 36,506 psi | 60% | 2608 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 51,793 psi | 85% | 2769 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,366 psi | 71% | 2680 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,363 psi | 65% | 2661 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 90% | 38,290 psi | 63% | 2641 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 50,212 psi | 82% | 2782 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,798 psi | 64% | 2661 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,110 psi | 49% | 2507 fps | 97% |
| Vihtavuori N560 | <<locked>> | 94% | 47,935 psi | 79% | 2936 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,334 psi | 63% | 2625 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 40,176 psi | 66% | 2717 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,047 psi | 39% | 2395 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,857 psi | 67% | 2700 fps | 95.4% |
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 85 powders for .300 Blaser Mag. loaded with the .308 | 175gr | Sierra Tipped MatchKing. Norma MRP delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,074 fps. Alliant Reloder-22 gives the best case fill at 100 %, and 85 of the 85 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 175.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-22, Alliant Reloder-23, 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 | 175gr | Sierra Tipped 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.