Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 165gr | Barnes X BT bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and ReloadSwiss RS 70.
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 3100 | <<locked>> | 98% | 54,157 psi | 89% | 2999 fps | 99.6% |
| Accurate 4350 | <<locked>> | 88% | 52,634 psi | 86% | 2999 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 54,534 psi | 90% | 3140 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 54,505 psi | 89% | 2963 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 52,678 psi | 86% | 3025 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 98% | 53,722 psi | 88% | 3071 fps | 96.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 52,881 psi | 87% | 3025 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 52,402 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 52,417 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,577 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 52,214 psi | 86% | 3018 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,997 psi | 87% | 3077 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,664 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,891 psi | 77% | 2995 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,780 psi | 88% | 3156 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,011 psi | 85% | 3058 fps | 97.7% |
| Bofors RP3 | <<locked>> | 82% | 53,447 psi | 88% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 52,997 psi | 87% | 3077 fps | 98% |
| Bofors RP7 | <<locked>> | 86% | 52,649 psi | 86% | 2936 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 82% | 53,461 psi | 88% | 2969 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 53,824 psi | 88% | 3038 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 86% | 53,606 psi | 88% | 2995 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 96% | 53,983 psi | 89% | 3018 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 52,866 psi | 87% | 2999 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 53,185 psi | 87% | 2972 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,137 psi | 76% | 3035 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 88% | 53,708 psi | 88% | 3071 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,854 psi | 61% | 1883 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,041 psi | 89% | 2946 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 53,243 psi | 87% | 2969 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,693 psi | 88% | 2959 fps | 99% |
| IMR 4831 | <<locked>> | 90% | 52,866 psi | 87% | 2986 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 52,344 psi | 86% | 2953 fps | 95.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,897 psi | 90% | 3107 fps | 97% |
| Lovex S062 | <<locked>> | 82% | 54,665 psi | 90% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,317 psi | 89% | 2963 fps | 99.7% |
| Lovex S070 | <<locked>> | 88% | 52,562 psi | 86% | 2956 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,573 psi | 80% | 2907 fps | 99% |
| Norma 203B | <<locked>> | 82% | 55,056 psi | 90% | 2999 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,766 psi | 88% | 3018 fps | 97.7% |
| Norma MRP | <<locked>> | 96% | 52,707 psi | 87% | 3107 fps | 99.1% |
| Norma URP | <<locked>> | 90% | 54,273 psi | 89% | 3028 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 51,735 psi | 85% | 3058 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 90% | 53,026 psi | 87% | 3028 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,966 psi | 82% | 2999 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 62% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 53,040 psi | 87% | 2946 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 53,026 psi | 87% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 51,982 psi | 85% | 3015 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,490 psi | 88% | 3094 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,064 psi | 76% | 3025 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 84% | 53,780 psi | 88% | 2959 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,418 psi | 89% | 2995 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 96% | 54,853 psi | 90% | 3058 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 86% | 52,649 psi | 86% | 2936 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,317 psi | 89% | 2963 fps | 99.7% |
| Shooters World Precision | <<locked>> | 82% | 54,665 psi | 90% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 52,562 psi | 86% | 2956 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,259 psi | 89% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,896 psi | 88% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,780 psi | 88% | 2910 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,375 psi | 89% | 3054 fps | 98.2% |
| Somchem S355 | <<locked>> | 84% | 53,505 psi | 88% | 2949 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 53,751 psi | 88% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 52,620 psi | 86% | 2986 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 86% | 54,433 psi | 89% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 52,837 psi | 87% | 2969 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,737 psi | 90% | 3005 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 88% | 52,272 psi | 86% | 2976 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 96% | 53,388 psi | 88% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 52,953 psi | 87% | 3091 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 51,924 psi | 85% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,056 psi | 89% | 3041 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,892 psi | 80% | 3136 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 52,025 psi | 85% | 2969 fps | 97.6% |
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 3100 | <<locked>> | 84% | 34,824 psi | 57% | 2618 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 40,785 psi | 67% | 2776 fps | 98.9% |
| Accurate High Country | <<locked>> | 92% | 47,732 psi | 78% | 3015 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 48,385 psi | 79% | 2858 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 43,656 psi | 72% | 2848 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 94% | 47,529 psi | 78% | 2953 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 43,918 psi | 72% | 2851 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,356 psi | 81% | 2890 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,783 psi | 64% | 2772 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,859 psi | 72% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 43,482 psi | 71% | 2844 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 41,321 psi | 68% | 2844 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,472 psi | 48% | 2539 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 32,880 psi | 54% | 2651 fps | 95.3% |
| Alliant Reloder-26 | 65.6 gr | 80% | 31,459 psi | 52% | 2654 fps | 95.7% |
| Bofors RP15 | <<locked>> | 94% | 43,352 psi | 71% | 2887 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 50,299 psi | 83% | 2907 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 41,321 psi | 68% | 2844 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 44,077 psi | 72% | 2772 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 80% | 50,198 psi | 82% | 2913 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 41,959 psi | 69% | 2808 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 44,614 psi | 73% | 2825 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 94% | 50,502 psi | 83% | 2956 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,705 psi | 82% | 2943 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,593 psi | 60% | 2664 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 96% | 40,785 psi | 67% | 2904 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 40,756 psi | 67% | 2818 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 46% | 1686 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,879 psi | 84% | 2894 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 39,508 psi | 65% | 2697 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,005 psi | 74% | 2799 fps | 97.5% |
| IMR 4831 | <<locked>> | 80% | 38,856 psi | 64% | 2720 fps | 98.6% |
| IMR 4955 Enduron | <<locked>> | 92% | 49,356 psi | 81% | 2897 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 48,341 psi | 79% | 2986 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 51,517 psi | 85% | 2894 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,163 psi | 71% | 2756 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 41,350 psi | 68% | 2736 fps | 96.9% |
| Lovex S071 | <<locked>> | 88% | 34,171 psi | 56% | 2602 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 51,880 psi | 85% | 2946 fps | 100% |
| Norma 204 | <<locked>> | 84% | 44,150 psi | 72% | 2838 fps | 95.5% |
| Norma MRP | 68.4 gr | 86% | 38,072 psi | 63% | 2802 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 39,813 psi | 65% | 2756 fps | 98.6% |
| Ramshot Grand | <<locked>> | 96% | 48,312 psi | 79% | 2995 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 38,609 psi | 63% | 2743 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 94% | 40,611 psi | 67% | 2812 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,340 psi | 47% | 1726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,038 psi | 82% | 2894 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,369 psi | 76% | 2949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,074 psi | 66% | 2785 fps | 98.5% |
| ReloadSwiss RS 70 | 65 gr | 80% | 38,624 psi | 63% | 2789 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 37,942 psi | 62% | 2822 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 47,413 psi | 78% | 2854 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 48,196 psi | 79% | 2884 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 88% | 42,743 psi | 70% | 2831 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 44,077 psi | 72% | 2772 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,163 psi | 71% | 2756 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 51,517 psi | 85% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,350 psi | 68% | 2736 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,935 psi | 79% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,863 psi | 79% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,177 psi | 69% | 2697 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 42,351 psi | 70% | 2828 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 47,514 psi | 78% | 2851 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 36,593 psi | 60% | 2723 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 38,566 psi | 63% | 2707 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 45,223 psi | 74% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,205 psi | 68% | 2753 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 40,132 psi | 66% | 2733 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 40,756 psi | 67% | 2756 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 32,590 psi | 54% | 2621 fps | 97.4% |
| Vihtavuori N560 | <<locked>> | 94% | 49,617 psi | 81% | 3028 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,045 psi | 66% | 2717 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 42,105 psi | 69% | 2812 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,426 psi | 43% | 2523 fps | 96.5% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,743 psi | 70% | 2792 fps | 95.3% |
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 75 powders for .300 Blaser Mag. loaded with the .308 | 165gr | Barnes X BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,156 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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. Norma MRP, Alliant Reloder-26, ReloadSwiss RS 70 rank at the top here: for .300 Blaser Mag. with the .308 | 165gr | Barnes X 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.