Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 180gr | Warner Tool Co. Flat Line bullet and 89 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 2495 | <<locked>> | 82% | 54,476 psi | 89% | 2756 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 52,083 psi | 86% | 2772 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,084 psi | 87% | 2871 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 54,868 psi | 90% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 51,866 psi | 85% | 2871 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 54,157 psi | 89% | 3018 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 86% | 54,882 psi | 90% | 2844 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 52,866 psi | 87% | 2913 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,998 psi | 89% | 2963 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,070 psi | 89% | 2969 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 52,997 psi | 87% | 2910 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 52,301 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 52,562 psi | 86% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 52,663 psi | 86% | 2927 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,635 psi | 88% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 52,286 psi | 86% | 2900 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,794 psi | 87% | 2956 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,937 psi | 82% | 2890 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,424 psi | 71% | 2818 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,476 psi | 88% | 3035 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,573 psi | 80% | 2884 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 53,098 psi | 87% | 2838 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,794 psi | 87% | 2956 fps | 98.4% |
| Bofors RP7 | <<locked>> | 88% | 52,533 psi | 86% | 2818 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 53,403 psi | 88% | 2851 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,099 psi | 89% | 2923 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 53,809 psi | 88% | 2877 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 54,172 psi | 89% | 2907 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,142 psi | 87% | 2887 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 53,026 psi | 87% | 2851 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,592 psi | 90% | 2887 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,540 psi | 70% | 2848 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 90% | 54,085 psi | 89% | 2959 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 60% | 1775 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,331 psi | 89% | 2828 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,461 psi | 88% | 2808 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 53,519 psi | 88% | 2854 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,143 psi | 89% | 2848 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 52,402 psi | 86% | 2864 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,940 psi | 89% | 2867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,504 psi | 86% | 2841 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,387 psi | 84% | 2930 fps | 96.9% |
| Lovex S062 | <<locked>> | 84% | 54,708 psi | 90% | 2822 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,273 psi | 89% | 2844 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 52,127 psi | 86% | 2835 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,324 psi | 73% | 2730 fps | 98.8% |
| Norma 203B | <<locked>> | 82% | 51,924 psi | 85% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,070 psi | 89% | 2907 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 52,243 psi | 86% | 2982 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 54,157 psi | 89% | 2907 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 52,359 psi | 86% | 2851 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,692 psi | 85% | 2946 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 53,011 psi | 87% | 2910 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,108 psi | 76% | 2822 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,970 psi | 61% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,287 psi | 87% | 2835 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,156 psi | 87% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 51,692 psi | 85% | 2894 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,780 psi | 88% | 2976 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,467 psi | 70% | 2841 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 82% | 53,345 psi | 88% | 2785 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 53,214 psi | 87% | 2831 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,607 psi | 90% | 2884 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 98% | 54,998 psi | 90% | 2943 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 52,533 psi | 86% | 2818 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,273 psi | 89% | 2844 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 54,708 psi | 90% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 52,127 psi | 86% | 2835 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,520 psi | 90% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,244 psi | 89% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,809 psi | 88% | 2795 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,505 psi | 89% | 2940 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 53,156 psi | 87% | 2828 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 52,663 psi | 86% | 2818 fps | 96.3% |
| Somchem S365 | <<locked>> | 94% | 53,374 psi | 88% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 52,025 psi | 85% | 2861 fps | 98.8% |
| Vihtavuori N135 | <<locked>> | 82% | 53,563 psi | 88% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,664 psi | 88% | 2756 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,404 psi | 89% | 2802 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 52,823 psi | 87% | 2851 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,213 psi | 84% | 2835 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 82% | 51,880 psi | 85% | 2756 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 51,967 psi | 85% | 2858 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 52,315 psi | 86% | 2917 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 52,692 psi | 87% | 2972 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 52,315 psi | 86% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,099 psi | 89% | 2923 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,136 psi | 74% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 52,011 psi | 85% | 2854 fps | 98% |
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 2495 | <<locked>> | 80% | 51,068 psi | 84% | 2710 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,791 psi | 80% | 2717 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 32,996 psi | 54% | 2490 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 48,399 psi | 79% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,709 psi | 60% | 2589 fps | 98.5% |
| Accurate High Country | 68.6 gr | 92% | 44,048 psi | 72% | 2835 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 45,745 psi | 75% | 2697 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 40,756 psi | 67% | 2680 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 96% | 47,253 psi | 78% | 2841 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,415 psi | 83% | 2913 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 40,930 psi | 67% | 2687 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,137 psi | 76% | 2720 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,168 psi | 81% | 2785 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,013 psi | 59% | 2602 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,553 psi | 67% | 2723 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,480 psi | 66% | 2677 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,466 psi | 66% | 2726 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,324 psi | 43% | 2359 fps | 96.5% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,691 psi | 52% | 2530 fps | 95.6% |
| Alliant Reloder-26 | 63 gr | 82% | 30,008 psi | 49% | 2526 fps | 95.8% |
| Bofors RP15 | <<locked>> | 94% | 39,914 psi | 66% | 2710 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 46,514 psi | 76% | 2733 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,466 psi | 66% | 2726 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 40,959 psi | 67% | 2605 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 80% | 46,818 psi | 77% | 2743 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 38,682 psi | 64% | 2635 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 41,756 psi | 69% | 2657 fps | 96% |
| Hodgdon H4831 | <<locked>> | 94% | 47,355 psi | 78% | 2789 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,617 psi | 81% | 2828 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,489 psi | 55% | 2497 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,039 psi | 84% | 2831 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 39,958 psi | 66% | 2785 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 37,739 psi | 62% | 2644 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 45% | 1588 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,124 psi | 79% | 2730 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,285 psi | 83% | 2756 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 36,535 psi | 60% | 2530 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,395 psi | 70% | 2638 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 35,447 psi | 58% | 2546 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 50,444 psi | 83% | 2815 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,456 psi | 76% | 2733 fps | 95% |
| IMR 7828 SSC | <<locked>> | 96% | 45,165 psi | 74% | 2812 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 48,283 psi | 79% | 2723 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,885 psi | 65% | 2589 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 38,058 psi | 62% | 2566 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 32,097 psi | 53% | 2467 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 48,544 psi | 80% | 2772 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,249 psi | 68% | 2674 fps | 95.3% |
| Norma MRP | 65.6 gr | 88% | 37,144 psi | 61% | 2680 fps | 96% |
| Norma URP | <<locked>> | 80% | 36,593 psi | 60% | 2585 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 48,979 psi | 80% | 2799 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 44,962 psi | 74% | 2822 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 35,476 psi | 58% | 2572 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 94% | 37,202 psi | 61% | 2635 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 45% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,731 psi | 77% | 2723 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,105 psi | 71% | 2776 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,521 psi | 60% | 2608 fps | 98.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 35,563 psi | 58% | 2615 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 36,927 psi | 61% | 2703 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 50,111 psi | 82% | 2736 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,700 psi | 72% | 2677 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,165 psi | 74% | 2720 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 88% | 39,436 psi | 65% | 2657 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 40,959 psi | 67% | 2605 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,885 psi | 65% | 2589 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 48,283 psi | 79% | 2723 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,058 psi | 62% | 2566 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,773 psi | 74% | 2730 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,005 psi | 74% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,088 psi | 64% | 2530 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,059 psi | 64% | 2654 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 44,048 psi | 72% | 2677 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,371 psi | 81% | 2762 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 33,054 psi | 54% | 2543 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 37,550 psi | 62% | 2589 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 50,241 psi | 82% | 2697 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,459 psi | 83% | 2710 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,018 psi | 69% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,942 psi | 62% | 2582 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 39,378 psi | 65% | 2618 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 48,820 psi | 80% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,521 psi | 62% | 2589 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 28,863 psi | 47% | 2431 fps | 96.6% |
| Vihtavuori N560 | <<locked>> | 94% | 46,151 psi | 76% | 2851 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,188 psi | 61% | 2556 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 38,841 psi | 64% | 2638 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,816 psi | 41% | 2388 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 90% | 39,537 psi | 65% | 2628 fps | 95% |
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 89 powders for .300 Blaser Mag. loaded with the .308 | 180gr | Warner Tool Co. Flat Line. Alliant Reloder-26 delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,035 fps. Accurate 3100 gives the best case fill at 100 %, and 89 of the 89 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 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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 | Warner Tool Co. Flat Line 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.