Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 135gr | Sierra HPBT MatchKing 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 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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>> | 84% | 53,185 psi | 87% | 3176 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,056 psi | 90% | 3228 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,950 psi | 79% | 3179 fps | 97.6% |
| Accurate 4064 | <<locked>> | 86% | 53,287 psi | 87% | 3232 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,693 psi | 88% | 3320 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 82% | 52,808 psi | 87% | 3258 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 88% | 54,085 psi | 89% | 3261 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,998 psi | 90% | 3258 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 52,866 psi | 87% | 3386 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,476 psi | 89% | 3287 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,969 psi | 90% | 3310 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,563 psi | 90% | 3389 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,315 psi | 86% | 3363 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,317 psi | 89% | 3340 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,049 psi | 74% | 3209 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,663 psi | 85% | 3415 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,808 psi | 87% | 3268 fps | 99.5% |
| Bofors RP3 | <<locked>> | 86% | 51,692 psi | 85% | 3245 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,940 psi | 90% | 3271 fps | 97.4% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,056 psi | 90% | 3291 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 52,417 psi | 86% | 3255 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 92% | 52,736 psi | 87% | 3314 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 90% | 52,837 psi | 87% | 3271 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 82% | 53,417 psi | 88% | 3271 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,810 psi | 90% | 3304 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 53,403 psi | 88% | 3304 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 52,953 psi | 87% | 3343 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,868 psi | 59% | 2090 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,505 psi | 89% | 3271 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,722 psi | 88% | 3255 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,461 psi | 88% | 3241 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,997 psi | 87% | 3212 fps | 97.6% |
| IMR 4350 | <<locked>> | 94% | 52,301 psi | 86% | 3238 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 90% | 53,301 psi | 88% | 3245 fps | 97.6% |
| IMR 4831 | <<locked>> | 96% | 54,389 psi | 89% | 3314 fps | 99.7% |
| IMR 4895 | <<locked>> | 84% | 52,649 psi | 86% | 3281 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 54,998 psi | 90% | 3258 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,852 psi | 87% | 3228 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 52,040 psi | 85% | 3179 fps | 99.9% |
| Lovex S062 | <<locked>> | 86% | 53,621 psi | 88% | 3241 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 53,171 psi | 87% | 3241 fps | 98.7% |
| Lovex S070 | <<locked>> | 94% | 54,244 psi | 89% | 3281 fps | 98% |
| Norma 201 | <<locked>> | 84% | 55,114 psi | 90% | 3258 fps | 100% |
| Norma 202 | <<locked>> | 82% | 52,185 psi | 86% | 3202 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,201 psi | 89% | 3297 fps | 100% |
| Norma MRPᴾ | <<locked>> | 100% | 50,792 psi | 83% | 3360 fps | 97.3% |
| Norma URP | <<locked>> | 94% | 52,649 psi | 86% | 3304 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 86% | 54,897 psi | 90% | 3317 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 51,532 psi | 85% | 3297 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,376 psi | 60% | 2136 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 52,620 psi | 86% | 3232 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 51,866 psi | 85% | 3320 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 51,866 psi | 85% | 3360 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 53,679 psi | 88% | 3343 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 52,576 psi | 86% | 3369 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 84% | 52,315 psi | 86% | 3199 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 51,750 psi | 85% | 3235 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,345 psi | 88% | 3323 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 92% | 54,940 psi | 90% | 3271 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 53,171 psi | 87% | 3241 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,852 psi | 87% | 3228 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 53,621 psi | 88% | 3241 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,244 psi | 89% | 3281 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 53,374 psi | 88% | 3301 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,114 psi | 89% | 3255 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,926 psi | 90% | 3284 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,649 psi | 86% | 3133 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 53,388 psi | 88% | 3133 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,171 psi | 87% | 3186 fps | 97.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,852 psi | 87% | 3314 fps | 96.2% |
| Somchem S335 | <<locked>> | 82% | 52,446 psi | 86% | 3130 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,737 psi | 88% | 3241 fps | 99.9% |
| Somchem S355 | <<locked>> | 88% | 51,938 psi | 85% | 3235 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,071 psi | 90% | 3369 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,186 psi | 89% | 3297 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 82% | 53,098 psi | 87% | 3117 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 52,170 psi | 86% | 3163 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 52,852 psi | 87% | 3176 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 53,272 psi | 87% | 3212 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,853 psi | 90% | 3304 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 86% | 54,621 psi | 90% | 3225 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,128 psi | 89% | 3307 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,256 psi | 83% | 3297 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,998 psi | 90% | 3271 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 52,736 psi | 87% | 3314 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,611 psi | 67% | 3235 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,853 psi | 90% | 3291 fps | 100% |
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% | 46,572 psi | 76% | 3068 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,167 psi | 79% | 3097 fps | 95.7% |
| Accurate 3100 | <<locked>> | 94% | 38,798 psi | 64% | 2982 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 44,048 psi | 72% | 3064 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 35,244 psi | 58% | 2923 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 49,574 psi | 81% | 3196 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 42,105 psi | 69% | 3022 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,677 psi | 85% | 3202 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,730 psi | 75% | 3241 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,090 psi | 69% | 3048 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,179 psi | 74% | 3123 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 34,896 psi | 57% | 2940 fps | 95.6% |
| Alliant Reloder-17 | 68 gr | 80% | 36,811 psi | 60% | 3022 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 98% | 50,966 psi | 84% | 3278 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 88% | 30,618 psi | 50% | 2828 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,781 psi | 59% | 3038 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,211 psi | 81% | 3202 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 42,206 psi | 69% | 3054 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 45,571 psi | 75% | 3087 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,285 psi | 84% | 3225 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,830 psi | 70% | 3061 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 43,033 psi | 71% | 3114 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 88% | 49,603 psi | 81% | 3209 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 50,096 psi | 82% | 3209 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,168 psi | 50% | 2759 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,528 psi | 76% | 3179 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 45,716 psi | 75% | 3196 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,658 psi | 44% | 1870 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,964 psi | 79% | 3153 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 50,212 psi | 82% | 3199 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,251 psi | 73% | 3061 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,586 psi | 76% | 3084 fps | 96.1% |
| IMR 4350 | <<locked>> | 90% | 46,050 psi | 76% | 3114 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,222 psi | 73% | 3058 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 34,069 psi | 56% | 2874 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 46,311 psi | 76% | 3159 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 51,677 psi | 85% | 3202 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,501 psi | 81% | 3173 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,878 psi | 80% | 3120 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 44,280 psi | 73% | 3064 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 38,943 psi | 64% | 2940 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 42,119 psi | 69% | 3031 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,515 psi | 80% | 3140 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,921 psi | 80% | 3143 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,541 psi | 73% | 3110 fps | 99.1% |
| Norma MRP | <<locked>> | 96% | 44,135 psi | 72% | 3212 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 35,302 psi | 58% | 2927 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 44,527 psi | 73% | 3123 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 39,320 psi | 65% | 3035 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,195 psi | 45% | 1916 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,047 psi | 71% | 3038 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,312 psi | 79% | 3251 fps | 99.3% |
| ReloadSwiss RS 60 | 68 gr | 80% | 39,160 psi | 64% | 3097 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,027 psi | 57% | 2940 fps | 95.1% |
| ReloadSwiss RS 70 | 72.5 gr | 84% | 37,159 psi | 61% | 3015 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 46,238 psi | 76% | 3087 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 39,711 psi | 65% | 2992 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 98% | 49,893 psi | 82% | 3258 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 86% | 45,571 psi | 75% | 3087 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 38,943 psi | 64% | 2940 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,501 psi | 81% | 3173 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,280 psi | 73% | 3064 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 42,119 psi | 69% | 3031 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,727 psi | 67% | 3045 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,357 psi | 83% | 3186 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,109 psi | 79% | 3159 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,559 psi | 81% | 3081 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,582 psi | 68% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,598 psi | 72% | 2999 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 49,414 psi | 81% | 3248 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 49,298 psi | 81% | 3077 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,053 psi | 82% | 3179 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 40,277 psi | 66% | 2999 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 29,704 psi | 49% | 2805 fps | 96.9% |
| Somchem S385 | <<locked>> | 96% | 47,398 psi | 78% | 3169 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 49,980 psi | 82% | 3068 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,050 psi | 76% | 3061 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,470 psi | 76% | 3068 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,377 psi | 63% | 2920 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 34,345 psi | 56% | 2864 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 44,904 psi | 74% | 3054 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,405 psi | 60% | 2930 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 33,576 psi | 55% | 2920 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,997 psi | 56% | 2835 fps | 97.4% |
| Winchester 760 | <<locked>> | 86% | 43,221 psi | 71% | 3117 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,095 psi | 48% | 2854 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,921 psi | 79% | 3163 fps | 99.8% |
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 109 powders for .300 Blaser Mag. loaded with the .308 | 135gr | Sierra HPBT MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 3,415 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,415 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Accurate MAGPRO 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-17, ReloadSwiss RS 60 rank at the top here: for .300 Blaser Mag. with the .308 | 135gr | Sierra HPBT MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate High Country, Accurate MAGPRO, ADI AR 2213 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.