Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 115gr | Sierra VarmintKing bullet and 87 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 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.
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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 2015 | <<locked>> | 84% | 54,781 psi | 90% | 3402 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,838 psi | 88% | 3419 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 51,909 psi | 85% | 3428 fps | 100% |
| Accurate 4064 | <<locked>> | 90% | 53,954 psi | 89% | 3471 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,940 psi | 89% | 3537 fps | 98.6% |
| ADI AR 2206H | <<locked>> | 86% | 54,186 psi | 89% | 3501 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 90% | 51,938 psi | 85% | 3432 fps | 98.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,127 psi | 87% | 3448 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 84% | 53,563 psi | 88% | 3435 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,012 psi | 89% | 3622 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 51,996 psi | 85% | 3461 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 88% | 52,359 psi | 86% | 3481 fps | 98.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,027 psi | 90% | 3609 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,852 psi | 87% | 3586 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,552 psi | 65% | 3268 fps | 97.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,556 psi | 73% | 3451 fps | 96.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 54,128 psi | 89% | 3504 fps | 98.8% |
| Bofors RP3 | <<locked>> | 90% | 52,417 psi | 86% | 3474 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,665 psi | 90% | 3432 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,547 psi | 86% | 3471 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,447 psi | 89% | 3583 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 90% | 53,388 psi | 88% | 3484 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 96% | 53,171 psi | 87% | 3527 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 86% | 54,708 psi | 90% | 3514 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,314 psi | 84% | 3461 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,302 psi | 89% | 3543 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 58% | 2238 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 52,576 psi | 86% | 3455 fps | 99.5% |
| IMR 3031 | <<locked>> | 86% | 54,389 psi | 89% | 3504 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,694 psi | 90% | 3478 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,737 psi | 90% | 3445 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,737 psi | 90% | 3471 fps | 96.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,534 psi | 90% | 3530 fps | 98.8% |
| IMR 4895 | <<locked>> | 88% | 53,693 psi | 88% | 3524 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 84% | 53,127 psi | 87% | 3448 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 86% | 53,925 psi | 89% | 3474 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,635 psi | 88% | 3419 fps | 99.4% |
| Lovex S062 | <<locked>> | 90% | 54,665 psi | 90% | 3478 fps | 99.9% |
| Lovex S065 | <<locked>> | 96% | 54,041 psi | 89% | 3458 fps | 97.5% |
| Lovex S070 | <<locked>> | 96% | 51,735 psi | 85% | 3432 fps | 95.9% |
| Norma 201 | <<locked>> | 86% | 52,924 psi | 87% | 3442 fps | 99.8% |
| Norma 202 | <<locked>> | 86% | 53,461 psi | 88% | 3451 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,027 psi | 90% | 3530 fps | 99.5% |
| Norma URP | <<locked>> | 98% | 53,084 psi | 87% | 3524 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 88% | 52,257 psi | 86% | 3488 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 98% | 52,011 psi | 85% | 3507 fps | 96.8% |
| Ramshot TAC | <<locked>> | 84% | 53,534 psi | 88% | 3448 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,040 psi | 87% | 3474 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,969 psi | 89% | 3438 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,694 psi | 59% | 2290 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,867 psi | 88% | 3458 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,678 psi | 86% | 3556 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 52,489 psi | 86% | 3596 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,809 psi | 88% | 3556 fps | 98.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,577 psi | 88% | 3586 fps | 98.2% |
| Rottweil R 901 | <<locked>> | 84% | 53,795 psi | 88% | 3435 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,505 psi | 88% | 3442 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 92% | 52,489 psi | 86% | 3468 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 54,041 psi | 89% | 3458 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,925 psi | 89% | 3474 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,665 psi | 90% | 3478 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 96% | 51,735 psi | 85% | 3432 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,215 psi | 89% | 3530 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 51,837 psi | 85% | 3419 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 52,750 psi | 87% | 3458 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,259 psi | 89% | 3383 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,708 psi | 90% | 3373 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 54,505 psi | 89% | 3402 fps | 96.2% |
| Somchem S321 | <<locked>> | 82% | 54,404 psi | 89% | 3478 fps | 99.9% |
| Somchem S335 | <<locked>> | 86% | 53,853 psi | 88% | 3376 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 51,634 psi | 85% | 3419 fps | 99.1% |
| Somchem S355 | <<locked>> | 92% | 52,663 psi | 86% | 3465 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,937 psi | 84% | 3527 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,838 psi | 88% | 3346 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,476 psi | 89% | 3369 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 52,910 psi | 87% | 3409 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,911 psi | 89% | 3419 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,346 psi | 89% | 3445 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 51,924 psi | 85% | 3458 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 84% | 53,534 psi | 88% | 3445 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 88% | 52,431 psi | 86% | 3409 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 54,853 psi | 90% | 3527 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,352 psi | 71% | 3363 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 52,504 psi | 86% | 3432 fps | 99.7% |
| Winchester 748 | <<locked>> | 84% | 53,592 psi | 88% | 3501 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,374 psi | 88% | 3530 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 86% | 52,576 psi | 86% | 3468 fps | 99.6% |
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 2015 | <<locked>> | 80% | 48,312 psi | 79% | 3291 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,060 psi | 67% | 3182 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,414 psi | 79% | 3363 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,798 psi | 64% | 3163 fps | 99.6% |
| Accurate 4350 | <<locked>> | 90% | 40,466 psi | 66% | 3255 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 44,556 psi | 73% | 3301 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 37,840 psi | 62% | 3114 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,615 psi | 77% | 3320 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 46,833 psi | 77% | 3320 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,756 psi | 67% | 3317 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,579 psi | 62% | 3140 fps | 96.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,292 psi | 66% | 3215 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 90% | 40,016 psi | 66% | 3264 fps | 95.5% |
| Alliant Reloder-17 | 69.8 gr | 82% | 34,838 psi | 57% | 3146 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 34,780 psi | 57% | 3130 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,495 psi | 68% | 3369 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,092 psi | 72% | 3297 fps | 96.8% |
| Bofors RP3 | <<locked>> | 80% | 37,188 psi | 61% | 3140 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,269 psi | 79% | 3310 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,832 psi | 75% | 3337 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,575 psi | 83% | 3510 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 82% | 40,770 psi | 67% | 3209 fps | 95% |
| Hodgdon H414 | <<locked>> | 94% | 49,763 psi | 82% | 3458 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 44,991 psi | 74% | 3320 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 34,563 psi | 57% | 3074 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,104 psi | 67% | 3268 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,208 psi | 43% | 2011 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,178 psi | 71% | 3258 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 44,440 psi | 73% | 3323 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,711 psi | 65% | 3156 fps | 96.2% |
| IMR 4166 Enduron | <<locked>> | 86% | 51,387 psi | 84% | 3379 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 51,416 psi | 84% | 3406 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 39,059 psi | 64% | 3199 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 41,292 psi | 68% | 3255 fps | 97.2% |
| IMR 8208 XBR | <<locked>> | 80% | 46,615 psi | 77% | 3320 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 80% | 43,874 psi | 72% | 3281 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 44,643 psi | 73% | 3235 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 39,755 psi | 65% | 3166 fps | 98% |
| Lovex S065 | <<locked>> | 90% | 44,875 psi | 74% | 3271 fps | 95.3% |
| Lovex S070 | <<locked>> | 94% | 48,544 psi | 80% | 3366 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 43,671 psi | 72% | 3251 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 44,019 psi | 72% | 3264 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 39,682 psi | 65% | 3199 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 40,437 psi | 66% | 3251 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 39,479 psi | 65% | 3212 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 94% | 45,513 psi | 75% | 3369 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 46,818 psi | 77% | 3310 fps | 96% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,383 psi | 76% | 3340 fps | 98.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,546 psi | 83% | 3376 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,484 psi | 43% | 2057 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 47,123 psi | 77% | 3320 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,337 psi | 70% | 3333 fps | 96.7% |
| ReloadSwiss RS 60 | 68.1 gr | 80% | 34,606 psi | 57% | 3159 fps | 97.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 40,364 psi | 66% | 3271 fps | 95.1% |
| ReloadSwiss RS 70 | 79.5 gr | 92% | 43,366 psi | 71% | 3353 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 47,558 psi | 78% | 3314 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,524 psi | 68% | 3192 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 34,911 psi | 57% | 3068 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,875 psi | 74% | 3271 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,874 psi | 72% | 3281 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 39,755 psi | 65% | 3166 fps | 98% |
| Shooters World SW4350 | <<locked>> | 94% | 48,544 psi | 80% | 3366 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,955 psi | 59% | 3120 fps | 95.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,223 psi | 74% | 3281 fps | 96.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,134 psi | 71% | 3258 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,933 psi | 74% | 3209 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,362 psi | 61% | 3038 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 51,053 psi | 84% | 3337 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 50,850 psi | 83% | 3415 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 44,599 psi | 73% | 3205 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,904 psi | 74% | 3281 fps | 97.9% |
| Somchem S355 | <<locked>> | 80% | 35,752 psi | 59% | 3081 fps | 95.9% |
| Somchem S365 | <<locked>> | 86% | 31,691 psi | 52% | 3051 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 50,662 psi | 83% | 3294 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,208 psi | 74% | 3205 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,886 psi | 67% | 3182 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,582 psi | 68% | 3182 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 34,040 psi | 56% | 3005 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 88% | 39,610 psi | 65% | 3192 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 46,775 psi | 77% | 3314 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 40,190 psi | 66% | 3163 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 41,814 psi | 69% | 3255 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 96% | 37,782 psi | 62% | 3228 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 34,882 psi | 57% | 3031 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 46,688 psi | 77% | 3366 fps | 99.7% |
| Winchester 760 | <<locked>> | 94% | 49,995 psi | 82% | 3461 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,815 psi | 70% | 3264 fps | 98.1% |
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 104 powders for .300 Blaser Mag. loaded with the .308 | 115gr | Sierra VarmintKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,622 fps; across all powders the maximum-charge window runs from 2,238 fps to 3,622 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 115.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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 60, Alliant Reloder-17, ReloadSwiss RS 70 rank at the top here: for .300 Blaser Mag. with the .308 | 115gr | Sierra VarmintKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, ADI AR 2209 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.