Load Specifications
Load data in caliber .300 Blaser Mag. with .309 | 170gr | Reichenberg HDB Universal 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 54,302 psi | 89% | 2861 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 52,446 psi | 86% | 2884 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,983 psi | 89% | 2986 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 54,839 psi | 90% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 52,402 psi | 86% | 2982 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 51,590 psi | 85% | 3071 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 98% | 52,533 psi | 86% | 3071 fps | 96% |
| ADI AR 2208 | <<locked>> | 84% | 52,054 psi | 85% | 2907 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,722 psi | 88% | 3028 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,013 psi | 90% | 3084 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,853 psi | 90% | 3087 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 53,824 psi | 88% | 3028 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 52,808 psi | 87% | 2930 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 52,939 psi | 87% | 2953 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 53,374 psi | 88% | 3041 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,607 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 53,098 psi | 87% | 3015 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,867 psi | 88% | 3074 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,850 psi | 83% | 3005 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,019 psi | 72% | 2927 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,708 psi | 90% | 3150 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,240 psi | 81% | 2995 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 53,258 psi | 87% | 2943 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,867 psi | 88% | 3074 fps | 98.5% |
| Bofors RP7 | <<locked>> | 88% | 53,055 psi | 87% | 2933 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 53,708 psi | 88% | 2963 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,868 psi | 90% | 3038 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 54,694 psi | 90% | 2999 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 98% | 55,085 psi | 90% | 3022 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,867 psi | 88% | 3002 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 53,751 psi | 88% | 2963 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,178 psi | 71% | 2959 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 88% | 51,169 psi | 84% | 3012 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 60% | 1860 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,824 psi | 90% | 2940 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,998 psi | 89% | 2923 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 54,056 psi | 89% | 2966 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,723 psi | 90% | 2963 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 52,910 psi | 87% | 2972 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,331 psi | 89% | 2982 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,272 psi | 87% | 2956 fps | 96.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,359 psi | 86% | 3051 fps | 97% |
| Lovex S062 | <<locked>> | 84% | 55,027 psi | 90% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,549 psi | 90% | 2956 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 52,547 psi | 86% | 2946 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,614 psi | 73% | 2828 fps | 98.7% |
| Norma 203B | <<locked>> | 82% | 52,243 psi | 86% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,824 psi | 90% | 3022 fps | 98.3% |
| Norma MRP | <<locked>> | 98% | 53,447 psi | 88% | 3100 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 54,839 psi | 90% | 3022 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 52,939 psi | 87% | 2963 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,605 psi | 86% | 3064 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 92% | 53,708 psi | 88% | 3025 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,876 psi | 77% | 2933 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,985 psi | 61% | 1903 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,766 psi | 88% | 2949 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,114 psi | 89% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 52,417 psi | 86% | 3005 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,665 psi | 90% | 3094 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,033 psi | 71% | 2949 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 82% | 53,374 psi | 88% | 2894 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 53,577 psi | 88% | 2943 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 51,851 psi | 85% | 2940 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 96% | 52,127 psi | 86% | 2999 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 53,055 psi | 87% | 2933 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,549 psi | 90% | 2956 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 55,027 psi | 90% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 52,547 psi | 86% | 2946 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 51,619 psi | 85% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,737 psi | 90% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,317 psi | 89% | 2907 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 51,677 psi | 85% | 2992 fps | 98.1% |
| Somchem S355 | <<locked>> | 86% | 53,447 psi | 88% | 2936 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 53,563 psi | 88% | 2933 fps | 96.4% |
| Somchem S365 | <<locked>> | 94% | 54,099 psi | 89% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 52,794 psi | 87% | 2976 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 53,969 psi | 89% | 2854 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,172 psi | 89% | 2867 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,955 psi | 90% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 53,548 psi | 88% | 2966 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,214 psi | 86% | 2949 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 82% | 52,446 psi | 86% | 2867 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 52,605 psi | 86% | 2966 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 53,026 psi | 87% | 3028 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 53,824 psi | 88% | 3091 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,026 psi | 87% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,868 psi | 90% | 3038 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,948 psi | 75% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 52,823 psi | 87% | 2966 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% | 50,865 psi | 84% | 2812 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,066 psi | 81% | 2828 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 33,040 psi | 54% | 2575 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 48,211 psi | 79% | 2822 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,840 psi | 60% | 2684 fps | 98.3% |
| Accurate High Country | 74 gr | 92% | 44,701 psi | 73% | 2943 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 96% | 48,704 psi | 80% | 3002 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 45,890 psi | 75% | 2799 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,031 psi | 67% | 2782 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 96% | 48,008 psi | 79% | 2956 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,111 psi | 84% | 3028 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,191 psi | 68% | 2785 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,282 psi | 76% | 2822 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,676 psi | 82% | 2897 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,013 psi | 59% | 2697 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,046 psi | 67% | 2828 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,741 psi | 67% | 2779 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,017 psi | 67% | 2828 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,136 psi | 43% | 2434 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,865 psi | 52% | 2621 fps | 95.4% |
| Alliant Reloder-26 | 67.9 gr | 82% | 29,950 psi | 49% | 2608 fps | 95.4% |
| Bofors RP15 | <<locked>> | 94% | 40,451 psi | 66% | 2815 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 46,543 psi | 76% | 2835 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,017 psi | 67% | 2828 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 40,973 psi | 67% | 2703 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 47,050 psi | 77% | 2848 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 39,030 psi | 64% | 2736 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 41,930 psi | 69% | 2759 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 94% | 48,037 psi | 79% | 2900 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,430 psi | 83% | 2943 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,446 psi | 55% | 2582 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,321 psi | 66% | 2887 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 38,029 psi | 62% | 2746 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 45% | 1663 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,269 psi | 79% | 2835 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,749 psi | 83% | 2871 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 36,738 psi | 60% | 2628 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,525 psi | 70% | 2740 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 35,360 psi | 58% | 2635 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 51,010 psi | 84% | 2927 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,833 psi | 77% | 2838 fps | 95% |
| IMR 7828 SSC | <<locked>> | 96% | 45,658 psi | 75% | 2923 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 48,486 psi | 80% | 2831 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,871 psi | 65% | 2684 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 38,130 psi | 63% | 2664 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 31,995 psi | 53% | 2546 fps | 95% |
| Norma 203B | <<locked>> | 80% | 49,023 psi | 80% | 2884 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,466 psi | 68% | 2772 fps | 95.2% |
| Norma MRP | 70.8 gr | 88% | 37,478 psi | 62% | 2779 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,767 psi | 60% | 2680 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,458 psi | 81% | 2907 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,658 psi | 75% | 2933 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 35,708 psi | 59% | 2667 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 94% | 37,608 psi | 62% | 2733 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,557 psi | 45% | 1703 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,065 psi | 77% | 2831 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,714 psi | 72% | 2884 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,637 psi | 60% | 2700 fps | 98% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 35,723 psi | 59% | 2710 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,260 psi | 61% | 2805 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 50,111 psi | 82% | 2841 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,845 psi | 72% | 2779 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,614 psi | 75% | 2825 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 88% | 39,740 psi | 65% | 2756 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 40,973 psi | 67% | 2703 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,871 psi | 65% | 2684 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 48,486 psi | 80% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,130 psi | 63% | 2664 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,223 psi | 74% | 2838 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,310 psi | 74% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,030 psi | 64% | 2625 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,105 psi | 69% | 2812 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 44,150 psi | 72% | 2779 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,951 psi | 82% | 2874 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 33,156 psi | 54% | 2635 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 37,710 psi | 62% | 2684 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 50,546 psi | 83% | 2805 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,879 psi | 84% | 2822 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,221 psi | 69% | 2707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,276 psi | 63% | 2684 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 39,798 psi | 65% | 2717 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 49,110 psi | 81% | 2815 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,637 psi | 62% | 2680 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 28,689 psi | 47% | 2510 fps | 96.1% |
| Vihtavuori N560 | <<locked>> | 94% | 46,804 psi | 77% | 2959 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,347 psi | 61% | 2651 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,030 psi | 64% | 2736 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,642 psi | 40% | 2461 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,714 psi | 70% | 2785 fps | 95.8% |
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 .309 | 170gr | Reichenberg HDB Universal. Alliant Reloder-26 delivers the highest muzzle velocity at 3,150 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,150 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 170.0 gr projectile in 0.309" calls for a 1:12.5 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 .309 | 170gr | Reichenberg HDB Universal 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.