Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 180gr | Barnes MRX BT 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% | 53,359 psi | 88% | 2818 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,868 psi | 90% | 2917 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 52,417 psi | 86% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,243 psi | 87% | 2910 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 52,707 psi | 87% | 3012 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 98% | 53,650 psi | 88% | 3012 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 84% | 52,982 psi | 87% | 2838 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,505 psi | 89% | 2963 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 52,156 psi | 86% | 2953 fps | 97.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,650 psi | 90% | 2956 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,621 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 53,693 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,375 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 51,924 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,911 psi | 89% | 2949 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,056 psi | 90% | 3012 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,851 psi | 85% | 2933 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,875 psi | 74% | 2867 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 51,648 psi | 85% | 3018 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,198 psi | 82% | 2930 fps | 98.2% |
| Bofors RP3 | <<locked>> | 84% | 54,230 psi | 89% | 2871 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,056 psi | 90% | 3012 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 53,780 psi | 88% | 2864 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 44,686 psi | 73% | 2805 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 84% | 54,694 psi | 90% | 2894 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 52,243 psi | 86% | 2913 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 51,909 psi | 85% | 2871 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 96% | 52,402 psi | 86% | 2900 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,839 psi | 90% | 2940 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,621 psi | 90% | 2890 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,888 psi | 72% | 2900 fps | 97.6% |
| Hodgdon Superformance | <<locked>> | 88% | 52,098 psi | 86% | 2946 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,419 psi | 60% | 1798 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,286 psi | 86% | 2818 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,694 psi | 90% | 2854 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 55,042 psi | 90% | 2900 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,286 psi | 86% | 2841 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 53,998 psi | 89% | 2907 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,940 psi | 89% | 2887 fps | 97.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,403 psi | 88% | 2989 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 52,533 psi | 86% | 2812 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 52,185 psi | 86% | 2835 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 53,417 psi | 88% | 2877 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,600 psi | 75% | 2769 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 52,997 psi | 87% | 2864 fps | 100% |
| Norma 204 | <<locked>> | 90% | 52,011 psi | 85% | 2894 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 54,505 psi | 89% | 3035 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 52,315 psi | 86% | 2897 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 53,766 psi | 88% | 2890 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,621 psi | 88% | 3005 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 54,723 psi | 90% | 2956 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,877 psi | 79% | 2874 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,086 psi | 61% | 1841 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,752 psi | 90% | 2881 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 51,343 psi | 84% | 2930 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,476 psi | 88% | 2940 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 51,822 psi | 85% | 2963 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,830 psi | 72% | 2897 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 82% | 54,201 psi | 89% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,346 psi | 89% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 52,707 psi | 87% | 2874 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 96% | 53,185 psi | 87% | 2936 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 53,780 psi | 88% | 2864 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 52,185 psi | 86% | 2835 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 52,533 psi | 86% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,417 psi | 88% | 2877 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 52,620 psi | 86% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 52,127 psi | 86% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 51,735 psi | 85% | 2785 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 52,721 psi | 87% | 2930 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 54,331 psi | 89% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,273 psi | 89% | 2867 fps | 97% |
| Somchem S365 | <<locked>> | 92% | 51,764 psi | 85% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 53,693 psi | 88% | 2910 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 54,795 psi | 90% | 2779 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 52,214 psi | 86% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,317 psi | 89% | 2890 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,011 psi | 87% | 2884 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 53,258 psi | 87% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,447 psi | 88% | 2897 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,244 psi | 89% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,766 psi | 90% | 3025 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 46,615 psi | 77% | 2871 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,085 psi | 89% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,243 psi | 86% | 2913 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,210 psi | 78% | 3002 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,867 psi | 88% | 2904 fps | 98.6% |
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% | 49,806 psi | 82% | 2759 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 31,386 psi | 52% | 2464 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 49,081 psi | 81% | 2749 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,478 psi | 62% | 2625 fps | 98.9% |
| Accurate High Country | 70.5 gr | 90% | 42,525 psi | 70% | 2818 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 96% | 49,893 psi | 82% | 2946 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 46,746 psi | 77% | 2733 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 39,189 psi | 64% | 2667 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 94% | 45,600 psi | 75% | 2831 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,247 psi | 64% | 2667 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,050 psi | 77% | 2753 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,343 psi | 83% | 2825 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,811 psi | 60% | 2641 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,887 psi | 69% | 2766 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 38,841 psi | 64% | 2661 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,102 psi | 64% | 2713 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,672 psi | 44% | 2388 fps | 97% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,429 psi | 50% | 2513 fps | 95.4% |
| Alliant Reloder-26 | 64.5 gr | 80% | 28,442 psi | 47% | 2497 fps | 95.3% |
| Bofors RP15 | <<locked>> | 92% | 38,580 psi | 63% | 2697 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 47,442 psi | 78% | 2766 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,102 psi | 64% | 2713 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 41,655 psi | 68% | 2641 fps | 97.1% |
| Hodgdon H1000 | <<locked>> | 98% | 41,756 psi | 69% | 2740 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 47,761 psi | 78% | 2779 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 39,711 psi | 65% | 2677 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 42,728 psi | 70% | 2700 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 92% | 45,571 psi | 75% | 2776 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 94% | 47,892 psi | 79% | 2822 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,272 psi | 56% | 2530 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 38,464 psi | 63% | 2769 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 38,754 psi | 64% | 2690 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,093 psi | 44% | 1604 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,182 psi | 81% | 2766 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,358 psi | 84% | 2799 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 37,376 psi | 61% | 2569 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,207 psi | 71% | 2674 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 36,114 psi | 59% | 2575 fps | 98.6% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,688 psi | 78% | 2779 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 94% | 43,395 psi | 71% | 2799 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 49,240 psi | 81% | 2759 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,509 psi | 67% | 2621 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 38,812 psi | 64% | 2602 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 30,501 psi | 50% | 2441 fps | 95% |
| Norma 203B | <<locked>> | 80% | 49,690 psi | 82% | 2812 fps | 100% |
| Norma 204 | <<locked>> | 82% | 39,407 psi | 65% | 2654 fps | 95.1% |
| Norma MRP | 67.3 gr | 86% | 35,534 psi | 58% | 2657 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 37,521 psi | 62% | 2625 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 50,183 psi | 82% | 2835 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 43,221 psi | 71% | 2808 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 36,376 psi | 60% | 2608 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 94% | 38,189 psi | 63% | 2680 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,586 psi | 45% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,790 psi | 78% | 2766 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,541 psi | 73% | 2818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,434 psi | 61% | 2644 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,289 psi | 60% | 2654 fps | 98.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 35,375 psi | 58% | 2687 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 51,024 psi | 84% | 2772 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,672 psi | 73% | 2713 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 43,439 psi | 71% | 2707 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 37,782 psi | 62% | 2641 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,655 psi | 68% | 2641 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,509 psi | 67% | 2621 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 49,240 psi | 81% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,812 psi | 64% | 2602 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,021 psi | 76% | 2772 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,064 psi | 76% | 2618 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,755 psi | 65% | 2569 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,132 psi | 66% | 2694 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 44,875 psi | 74% | 2713 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 47,413 psi | 78% | 2753 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 33,895 psi | 56% | 2575 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 35,911 psi | 59% | 2569 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 51,474 psi | 85% | 2730 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,975 psi | 71% | 2641 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,885 psi | 64% | 2618 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 37,855 psi | 62% | 2605 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 49,748 psi | 82% | 2740 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,261 psi | 63% | 2621 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 80% | 29,515 psi | 48% | 2464 fps | 97.1% |
| Vihtavuori N560 | <<locked>> | 92% | 44,425 psi | 73% | 2838 fps | 95% |
| Vihtavuori N565 | <<locked>> | 98% | 43,337 psi | 71% | 2805 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,058 psi | 62% | 2592 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 39,914 psi | 66% | 2680 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,453 psi | 39% | 2352 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,654 psi | 67% | 2671 fps | 95.7% |
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 87 powders for .300 Blaser Mag. loaded with the .308 | 180gr | Barnes MRX BT. Norma MRP delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,798 fps to 3,035 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 180.0 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 | 180gr | Barnes MRX BT 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.