Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 180gr | TWENTY-NINE ERTP bullet and 91 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% | 54,636 psi | 90% | 2759 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 52,243 psi | 86% | 2779 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,432 psi | 88% | 2877 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 55,013 psi | 90% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 51,982 psi | 85% | 2874 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 54,491 psi | 89% | 3025 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 98% | 51,735 psi | 85% | 2959 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 86% | 54,998 psi | 90% | 2848 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,200 psi | 87% | 2920 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,360 psi | 89% | 2966 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,186 psi | 89% | 2972 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 53,084 psi | 87% | 2913 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 53,084 psi | 87% | 2913 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 52,431 psi | 86% | 2822 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 52,707 psi | 87% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 52,823 psi | 87% | 2930 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,027 psi | 89% | 2953 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 52,359 psi | 86% | 2907 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,142 psi | 87% | 2963 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,024 psi | 82% | 2894 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,685 psi | 72% | 2822 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,577 psi | 88% | 3035 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,631 psi | 80% | 2887 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 53,243 psi | 87% | 2838 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,142 psi | 87% | 2963 fps | 98.5% |
| Bofors RP7 | <<locked>> | 88% | 52,692 psi | 87% | 2825 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 53,505 psi | 88% | 2854 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,230 psi | 89% | 2927 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 54,172 psi | 89% | 2887 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 54,476 psi | 89% | 2913 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,229 psi | 87% | 2890 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 53,185 psi | 87% | 2854 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,752 psi | 90% | 2890 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,815 psi | 70% | 2854 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 90% | 54,215 psi | 89% | 2963 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 60% | 1778 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,708 psi | 90% | 2835 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,824 psi | 88% | 2818 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 53,577 psi | 88% | 2858 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,244 psi | 89% | 2851 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 52,518 psi | 86% | 2867 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,099 psi | 89% | 2874 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,808 psi | 87% | 2848 fps | 96.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,706 psi | 85% | 2936 fps | 97% |
| Lovex S062 | <<locked>> | 84% | 54,853 psi | 90% | 2825 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,360 psi | 89% | 2848 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 52,257 psi | 86% | 2838 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,396 psi | 73% | 2730 fps | 98.8% |
| Norma 203B | <<locked>> | 82% | 52,054 psi | 85% | 2831 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,186 psi | 89% | 2910 fps | 98.3% |
| Norma MRP | <<locked>> | 98% | 52,620 psi | 86% | 2992 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 54,273 psi | 89% | 2910 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 52,475 psi | 86% | 2854 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,011 psi | 85% | 2953 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 92% | 53,098 psi | 87% | 2913 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,383 psi | 76% | 2828 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,014 psi | 61% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,403 psi | 88% | 2838 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,519 psi | 88% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 51,822 psi | 85% | 2897 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,099 psi | 89% | 2982 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,511 psi | 70% | 2844 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 82% | 53,505 psi | 88% | 2789 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 53,345 psi | 88% | 2835 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,897 psi | 90% | 2890 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 98% | 55,071 psi | 90% | 2946 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 52,692 psi | 87% | 2825 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,360 psi | 89% | 2848 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 54,853 psi | 90% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 52,257 psi | 86% | 2838 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,882 psi | 90% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,433 psi | 89% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,157 psi | 89% | 2802 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,578 psi | 90% | 2940 fps | 98.7% |
| Somchem S355 | <<locked>> | 86% | 53,316 psi | 88% | 2831 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 52,968 psi | 87% | 2825 fps | 96.4% |
| Somchem S365 | <<locked>> | 94% | 53,505 psi | 88% | 2913 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 52,344 psi | 86% | 2867 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 53,737 psi | 88% | 2746 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,853 psi | 88% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,563 psi | 90% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 52,953 psi | 87% | 2851 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,547 psi | 85% | 2841 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 82% | 52,243 psi | 86% | 2759 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 52,069 psi | 85% | 2858 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 52,649 psi | 86% | 2920 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 52,982 psi | 87% | 2976 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 52,388 psi | 86% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,491 psi | 89% | 2930 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,237 psi | 74% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 52,359 psi | 86% | 2861 fps | 98.1% |
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% | 51,242 psi | 84% | 2713 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,892 psi | 80% | 2720 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 33,286 psi | 55% | 2497 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 48,559 psi | 80% | 2723 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,999 psi | 61% | 2595 fps | 98.6% |
| Accurate High Country | 68.8 gr | 92% | 44,150 psi | 72% | 2835 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 96% | 48,211 psi | 79% | 2897 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 45,890 psi | 75% | 2700 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 40,857 psi | 67% | 2687 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 47,543 psi | 78% | 2844 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,575 psi | 83% | 2913 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,046 psi | 67% | 2687 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,046 psi | 67% | 2687 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,296 psi | 76% | 2723 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,559 psi | 81% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,143 psi | 59% | 2608 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,886 psi | 67% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,596 psi | 67% | 2684 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,756 psi | 67% | 2733 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,426 psi | 43% | 2362 fps | 96.6% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,923 psi | 52% | 2536 fps | 95.8% |
| Alliant Reloder-26 | 63.2 gr | 82% | 30,095 psi | 49% | 2533 fps | 95.9% |
| Bofors RP15 | <<locked>> | 94% | 40,205 psi | 66% | 2720 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,644 psi | 77% | 2736 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,756 psi | 67% | 2733 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 41,089 psi | 67% | 2608 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 80% | 47,007 psi | 77% | 2746 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 38,798 psi | 64% | 2638 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 41,887 psi | 69% | 2661 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 94% | 47,630 psi | 78% | 2795 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,879 psi | 82% | 2835 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,620 psi | 55% | 2500 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,169 psi | 84% | 2838 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,059 psi | 66% | 2789 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 37,855 psi | 62% | 2651 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 45% | 1585 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,269 psi | 79% | 2733 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,430 psi | 83% | 2762 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 36,695 psi | 60% | 2536 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,511 psi | 70% | 2641 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 35,578 psi | 58% | 2549 fps | 98.3% |
| IMR 4895 | <<locked>> | 80% | 50,850 psi | 83% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,514 psi | 76% | 2736 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 45,223 psi | 74% | 2815 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 48,486 psi | 80% | 2730 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,016 psi | 66% | 2592 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 38,189 psi | 63% | 2569 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 32,198 psi | 53% | 2467 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 48,921 psi | 80% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,394 psi | 68% | 2677 fps | 95.4% |
| Norma MRP | 64.3 gr | 86% | 34,780 psi | 57% | 2621 fps | 95% |
| Norma URP | <<locked>> | 80% | 36,724 psi | 60% | 2589 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 49,095 psi | 81% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,034 psi | 74% | 2822 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 35,592 psi | 58% | 2575 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 94% | 37,289 psi | 61% | 2638 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 45% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,065 psi | 77% | 2730 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,453 psi | 71% | 2782 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,651 psi | 60% | 2612 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 35,694 psi | 59% | 2618 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,159 psi | 61% | 2713 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 50,270 psi | 83% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,845 psi | 72% | 2680 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,237 psi | 74% | 2723 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 39,581 psi | 65% | 2664 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 41,089 psi | 67% | 2608 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,016 psi | 66% | 2592 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 48,486 psi | 80% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,189 psi | 63% | 2569 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,904 psi | 74% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,165 psi | 74% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,189 psi | 64% | 2536 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,204 psi | 64% | 2657 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 44,193 psi | 73% | 2680 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,676 psi | 82% | 2769 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 33,185 psi | 54% | 2546 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 37,681 psi | 62% | 2592 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 50,430 psi | 83% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,604 psi | 83% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,148 psi | 69% | 2608 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,261 psi | 63% | 2589 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 92% | 39,653 psi | 65% | 2625 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 48,950 psi | 80% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,637 psi | 62% | 2589 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 28,993 psi | 48% | 2438 fps | 96.6% |
| Vihtavuori N560 | <<locked>> | 94% | 46,282 psi | 76% | 2854 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,275 psi | 61% | 2556 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 39,001 psi | 64% | 2641 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,889 psi | 41% | 2392 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 90% | 39,624 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 91 powders for .300 Blaser Mag. loaded with the .308 | 180gr | TWENTY-NINE ERTP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,778 fps to 3,035 fps. Accurate 3100 gives the best case fill at 100 %, and 91 of the 91 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 1:9.5 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 | TWENTY-NINE ERTP 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.