Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 140gr | Barnes X BT bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,679 psi | 90% | 3117 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,679 psi | 90% | 3150 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,243 psi | 86% | 3189 fps | 98.5% |
| Accurate 4064 | <<locked>> | 84% | 54,853 psi | 90% | 3173 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,317 psi | 89% | 3258 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 86% | 53,679 psi | 88% | 3182 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 98% | 54,679 psi | 90% | 3278 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 52,156 psi | 86% | 3301 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,607 psi | 90% | 3212 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,810 psi | 90% | 3235 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,389 psi | 89% | 3314 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 52,098 psi | 86% | 3284 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,143 psi | 89% | 3268 fps | 96.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,329 psi | 84% | 3264 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,559 psi | 80% | 3209 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,859 psi | 70% | 3107 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 51,764 psi | 85% | 3350 fps | 99.6% |
| Bofors RP3 | <<locked>> | 84% | 52,257 psi | 86% | 3176 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,329 psi | 84% | 3264 fps | 96.1% |
| Bofors RP7 | <<locked>> | 90% | 54,882 psi | 90% | 3199 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 84% | 52,417 psi | 86% | 3182 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 90% | 52,547 psi | 86% | 3238 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 88% | 52,475 psi | 86% | 3196 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,679 psi | 90% | 3232 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,113 psi | 87% | 3225 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 52,533 psi | 86% | 3271 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 60% | 2044 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,983 psi | 89% | 3189 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,301 psi | 88% | 3166 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 82% | 52,634 psi | 86% | 3133 fps | 97.7% |
| IMR 4350 | <<locked>> | 92% | 52,083 psi | 86% | 3166 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 52,895 psi | 87% | 3166 fps | 97.6% |
| IMR 4831 | <<locked>> | 94% | 54,520 psi | 90% | 3245 fps | 99.7% |
| IMR 4895 | <<locked>> | 82% | 52,779 psi | 87% | 3209 fps | 99.9% |
| Lovex S060 | <<locked>> | 82% | 54,853 psi | 90% | 3153 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,795 psi | 88% | 3166 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,388 psi | 88% | 3173 fps | 98.8% |
| Lovex S070 | <<locked>> | 92% | 54,462 psi | 89% | 3212 fps | 98.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,801 psi | 72% | 3028 fps | 96.8% |
| Norma 203B | <<locked>> | 84% | 54,143 psi | 89% | 3222 fps | 100% |
| Norma 204 | <<locked>> | 92% | 52,475 psi | 86% | 3212 fps | 95.9% |
| Norma MRPᴾ | <<locked>> | 100% | 54,418 psi | 89% | 3360 fps | 98.2% |
| Norma URP | <<locked>> | 92% | 52,721 psi | 87% | 3235 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 84% | 54,418 psi | 89% | 3238 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,810 psi | 90% | 3287 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 61% | 2093 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 52,402 psi | 86% | 3159 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 51,561 psi | 85% | 3281 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,737 psi | 88% | 3274 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 52,315 psi | 86% | 3297 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 82% | 52,765 psi | 87% | 3130 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 52,315 psi | 86% | 3173 fps | 100% |
| Rottweil R 905 | <<locked>> | 98% | 53,345 psi | 88% | 3251 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 90% | 54,882 psi | 90% | 3199 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,388 psi | 88% | 3173 fps | 98.8% |
| Shooters World Precision | <<locked>> | 84% | 53,795 psi | 88% | 3166 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,462 psi | 89% | 3212 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,185 psi | 87% | 3225 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,360 psi | 89% | 3202 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,127 psi | 87% | 3054 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,084 psi | 87% | 3114 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,852 psi | 87% | 3248 fps | 96.4% |
| Somchem S355 | <<locked>> | 86% | 52,373 psi | 86% | 3166 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 51,605 psi | 85% | 3245 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,331 psi | 89% | 3232 fps | 97.5% |
| Vihtavuori N135 | <<locked>> | 82% | 52,562 psi | 86% | 3091 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 52,663 psi | 86% | 3100 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,330 psi | 88% | 3140 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,766 psi | 90% | 3228 fps | 99.7% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,879 psi | 82% | 3133 fps | 96.2% |
| Vihtavuori N540 | <<locked>> | 84% | 54,288 psi | 89% | 3146 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,157 psi | 89% | 3235 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,505 psi | 89% | 3304 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,317 psi | 89% | 3192 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 52,765 psi | 87% | 3245 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,237 psi | 73% | 3258 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,433 psi | 89% | 3209 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,041 psi | 89% | 3215 fps | 96.4% |
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% | 51,561 psi | 85% | 3068 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,182 psi | 79% | 3028 fps | 95.9% |
| Accurate 3100 | <<locked>> | 92% | 40,451 psi | 66% | 2953 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 48,689 psi | 80% | 3071 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,767 psi | 60% | 2894 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 80% | 44,918 psi | 74% | 3015 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 51,517 psi | 85% | 3219 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,921 psi | 80% | 3235 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,469 psi | 75% | 3045 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,370 psi | 79% | 3117 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,621 psi | 58% | 2890 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,900 psi | 66% | 3031 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,819 psi | 79% | 3146 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 98% | 48,153 psi | 79% | 3202 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 84% | 30,240 psi | 50% | 2749 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 96% | 38,087 psi | 63% | 2982 fps | 95.4% |
| Alliant Reloder-26 | 74.7 gr | 88% | 36,912 psi | 61% | 3005 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 46,108 psi | 76% | 3061 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 48,153 psi | 79% | 3202 fps | 95.3% |
| Bofors RP7 | <<locked>> | 84% | 45,948 psi | 75% | 3022 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 46,311 psi | 76% | 3061 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 43,366 psi | 71% | 3051 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 49,327 psi | 81% | 3133 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,330 psi | 55% | 2785 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,850 psi | 82% | 3169 fps | 100% |
| Hodgdon Superformance | 75.3 gr | 86% | 45,803 psi | 75% | 3130 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,369 psi | 45% | 1831 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,763 psi | 83% | 3130 fps | 99.9% |
| IMR 4064 | <<locked>> | 80% | 47,239 psi | 78% | 3051 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,487 psi | 81% | 3074 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 46,209 psi | 76% | 3048 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 44,367 psi | 73% | 2995 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 35,259 psi | 58% | 2838 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 49,617 psi | 81% | 3150 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 51,663 psi | 85% | 3097 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 47,761 psi | 78% | 3061 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,900 psi | 66% | 2894 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 43,018 psi | 71% | 2982 fps | 95.7% |
| Lovex S071 | <<locked>> | 96% | 38,943 psi | 64% | 2920 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 47,863 psi | 79% | 3104 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 49,269 psi | 81% | 3153 fps | 95.1% |
| Norma MRP | <<locked>> | 94% | 44,657 psi | 73% | 3159 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,376 psi | 60% | 2884 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 47,848 psi | 79% | 3123 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 40,016 psi | 66% | 2982 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 46% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,238 psi | 76% | 3038 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,221 psi | 69% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,216 psi | 59% | 2904 fps | 95.9% |
| ReloadSwiss RS 70 | 68.9 gr | 82% | 37,608 psi | 62% | 2959 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 49,792 psi | 82% | 3077 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,642 psi | 72% | 3005 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 96% | 49,951 psi | 82% | 3189 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 84% | 45,948 psi | 75% | 3022 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,900 psi | 66% | 2894 fps | 95.9% |
| Shooters World Precision | <<locked>> | 80% | 47,761 psi | 78% | 3061 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 43,018 psi | 71% | 2982 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,961 psi | 72% | 3048 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,184 psi | 84% | 3143 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,440 psi | 73% | 2907 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 41,568 psi | 68% | 2884 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 49,472 psi | 81% | 3182 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 43,816 psi | 72% | 3002 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 33,011 psi | 54% | 2838 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 45,034 psi | 74% | 3051 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 49,545 psi | 81% | 3041 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,676 psi | 82% | 3051 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,785 psi | 69% | 2927 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 37,521 psi | 62% | 2877 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 46,934 psi | 77% | 3074 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,109 psi | 79% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,289 psi | 61% | 2884 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 33,054 psi | 54% | 2838 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,999 psi | 61% | 2848 fps | 98.5% |
| Winchester 760 | <<locked>> | 84% | 43,526 psi | 71% | 3058 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,790 psi | 47% | 2779 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,198 psi | 84% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 50,575 psi | 83% | 3150 fps | 95.6% |
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 94 powders for .300 Blaser Mag. loaded with the .308 | 140gr | Barnes X BT. Norma MRP delivers the highest muzzle velocity at 3,360 fps; across all powders the maximum-charge window runs from 2,044 fps to 3,360 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 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 140.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 Blaser Mag. with the .308 | 140gr | Barnes X BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.