Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 136gr | Geco ZERO bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Reloder-16.
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 2015 | <<locked>> | 82% | 54,143 psi | 89% | 3146 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 52,881 psi | 87% | 3163 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,330 psi | 88% | 3225 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,330 psi | 88% | 3225 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,606 psi | 88% | 3166 fps | 96.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,266 psi | 73% | 3094 fps | 96.6% |
| Accurate 4064 | <<locked>> | 88% | 53,316 psi | 88% | 3219 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 53,824 psi | 88% | 3310 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 84% | 53,490 psi | 88% | 3255 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 54,940 psi | 90% | 3258 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 52,518 psi | 86% | 3199 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,490 psi | 88% | 3176 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,664 psi | 88% | 3386 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,071 psi | 90% | 3281 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 51,982 psi | 85% | 3245 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,114 psi | 90% | 3383 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 52,678 psi | 86% | 3353 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,032 psi | 69% | 3130 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,906 psi | 79% | 3323 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,534 psi | 88% | 3264 fps | 99.5% |
| Bofors RP3 | <<locked>> | 88% | 51,967 psi | 85% | 3235 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 52,301 psi | 86% | 3202 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,012 psi | 89% | 3186 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 52,054 psi | 85% | 3225 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,011 psi | 87% | 3251 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 92% | 54,592 psi | 90% | 3333 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 94% | 51,793 psi | 85% | 3232 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 84% | 54,070 psi | 89% | 3268 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,114 psi | 90% | 3294 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,288 psi | 89% | 3304 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,635 psi | 88% | 3340 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,447 psi | 58% | 2060 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,360 psi | 89% | 3251 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 52,794 psi | 87% | 3228 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,432 psi | 88% | 3225 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 52,779 psi | 87% | 3189 fps | 97.3% |
| IMR 4350 | <<locked>> | 96% | 52,852 psi | 87% | 3232 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,085 psi | 89% | 3238 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,576 psi | 85% | 3251 fps | 99.3% |
| IMR 4895 | <<locked>> | 86% | 53,345 psi | 88% | 3281 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 52,518 psi | 86% | 3199 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,330 psi | 88% | 3225 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,084 psi | 87% | 3179 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 54,041 psi | 89% | 3232 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 53,708 psi | 88% | 3235 fps | 98.7% |
| Lovex S070 | <<locked>> | 96% | 54,694 psi | 90% | 3271 fps | 98% |
| Norma 201 | <<locked>> | 84% | 52,141 psi | 86% | 3192 fps | 100% |
| Norma 202 | <<locked>> | 84% | 52,953 psi | 87% | 3199 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,752 psi | 90% | 3291 fps | 99.9% |
| Norma MRPᴾ | <<locked>> | 100% | 47,384 psi | 78% | 3271 fps | 96.2% |
| Norma URP | <<locked>> | 96% | 52,968 psi | 87% | 3297 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 86% | 51,938 psi | 85% | 3255 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 96% | 51,996 psi | 85% | 3291 fps | 98.2% |
| Ramshot TAC | <<locked>> | 82% | 52,736 psi | 87% | 3212 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 52,562 psi | 86% | 3235 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,882 psi | 59% | 2106 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,171 psi | 87% | 3225 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 52,446 psi | 86% | 3317 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 52,417 psi | 86% | 3356 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,853 psi | 88% | 3333 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 53,200 psi | 87% | 3363 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 82% | 52,924 psi | 87% | 3176 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 52,750 psi | 87% | 3192 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 52,054 psi | 85% | 3228 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 52,301 psi | 86% | 3202 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 53,708 psi | 88% | 3235 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,330 psi | 88% | 3225 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,041 psi | 89% | 3232 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,694 psi | 90% | 3271 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,940 psi | 89% | 3294 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,810 psi | 90% | 3251 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 52,199 psi | 86% | 3222 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,621 psi | 88% | 3133 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,172 psi | 89% | 3127 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,708 psi | 88% | 3176 fps | 97.6% |
| Somchem S335 | <<locked>> | 84% | 53,026 psi | 87% | 3127 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,549 psi | 90% | 3238 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 52,344 psi | 86% | 3225 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,998 psi | 90% | 3360 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,807 psi | 83% | 3222 fps | 96.5% |
| Unknown powder | <<locked>> | 94% | 53,983 psi | 89% | 3307 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 84% | 54,027 psi | 89% | 3117 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 52,591 psi | 86% | 3156 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,592 psi | 88% | 3176 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,795 psi | 88% | 3205 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 51,924 psi | 85% | 3235 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 82% | 52,910 psi | 87% | 3199 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 51,866 psi | 85% | 3166 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,404 psi | 89% | 3297 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,659 psi | 77% | 3219 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 51,909 psi | 85% | 3205 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,592 psi | 90% | 3333 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,782 psi | 62% | 3140 fps | 99.3% |
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% | 50,763 psi | 83% | 3091 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,279 psi | 71% | 3002 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,559 psi | 81% | 3163 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,559 psi | 81% | 3163 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 46,804 psi | 77% | 3041 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 41,307 psi | 68% | 3031 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 40,988 psi | 67% | 2992 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,882 psi | 57% | 2907 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,992 psi | 77% | 3133 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 39,943 psi | 66% | 2959 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,168 psi | 81% | 3140 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,995 psi | 82% | 3123 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,250 psi | 71% | 3169 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,682 psi | 65% | 2979 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,612 psi | 70% | 3054 fps | 98.3% |
| Alliant Reloder-16 | 63.9 gr | 84% | 34,940 psi | 57% | 2927 fps | 95.4% |
| Alliant Reloder-17 | 65.6 gr | 80% | 34,447 psi | 57% | 2940 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,356 psi | 50% | 2808 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 38,319 psi | 63% | 3097 fps | 96.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,702 psi | 77% | 3136 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 39,436 psi | 65% | 2982 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 45,919 psi | 75% | 3077 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,821 psi | 83% | 3130 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,472 psi | 80% | 3163 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,292 psi | 66% | 2989 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 86% | 44,222 psi | 73% | 3127 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 92% | 48,486 psi | 80% | 3166 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 47,471 psi | 78% | 3143 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,037 psi | 49% | 2746 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,234 psi | 68% | 3054 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 90% | 46,340 psi | 76% | 3192 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 43% | 1847 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,206 psi | 69% | 3018 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 43,323 psi | 71% | 3061 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,972 psi | 64% | 2930 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 84% | 44,019 psi | 72% | 3012 fps | 95.2% |
| IMR 4350 | <<locked>> | 92% | 46,499 psi | 76% | 3107 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,788 psi | 74% | 3054 fps | 95.3% |
| IMR 4831 | <<locked>> | 88% | 34,737 psi | 57% | 2884 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 43,671 psi | 72% | 3091 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 49,168 psi | 81% | 3140 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 46,427 psi | 76% | 3104 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,731 psi | 77% | 3061 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 41,756 psi | 69% | 2999 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 38,957 psi | 64% | 2927 fps | 95.2% |
| Lovex S070 | <<locked>> | 88% | 42,192 psi | 69% | 3022 fps | 95% |
| Norma 201 | <<locked>> | 80% | 45,948 psi | 75% | 3077 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,412 psi | 76% | 3084 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,959 psi | 69% | 3041 fps | 98.6% |
| Norma MRP | <<locked>> | 98% | 44,193 psi | 73% | 3202 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 35,215 psi | 58% | 2913 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 41,974 psi | 69% | 3058 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 42,206 psi | 69% | 3091 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 49,269 psi | 81% | 3146 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,994 psi | 80% | 3173 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,731 psi | 44% | 1890 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,598 psi | 72% | 3038 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,527 psi | 75% | 3182 fps | 98.8% |
| ReloadSwiss RS 60 | 65.6 gr | 80% | 36,753 psi | 60% | 3022 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 37,478 psi | 62% | 2995 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 37,333 psi | 61% | 3005 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 49,705 psi | 82% | 3120 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,627 psi | 72% | 3022 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 36,927 psi | 61% | 2917 fps | 98% |
| Rottweil R 907 | <<locked>> | 88% | 45,919 psi | 75% | 3077 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,957 psi | 64% | 2927 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,427 psi | 76% | 3104 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,756 psi | 69% | 2999 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 88% | 42,192 psi | 69% | 3022 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,334 psi | 63% | 2979 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,718 psi | 78% | 3120 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,701 psi | 75% | 3094 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,108 psi | 77% | 3022 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,334 psi | 65% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,932 psi | 72% | 2989 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 46,876 psi | 77% | 3022 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,543 psi | 78% | 3117 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 37,826 psi | 62% | 2927 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 27,441 psi | 45% | 2720 fps | 95.5% |
| Somchem S385 | <<locked>> | 98% | 47,384 psi | 78% | 3156 fps | 95.6% |
| Unknown powder | <<locked>> | 84% | 38,290 psi | 63% | 2982 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 47,558 psi | 78% | 3015 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,294 psi | 71% | 2999 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,918 psi | 72% | 3005 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,940 psi | 59% | 2851 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 36,767 psi | 60% | 2917 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 49,429 psi | 81% | 3140 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,467 psi | 70% | 2995 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,361 psi | 60% | 2920 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 90% | 33,040 psi | 54% | 2897 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,981 psi | 53% | 2766 fps | 96.4% |
| Winchester 760 | <<locked>> | 86% | 44,222 psi | 73% | 3127 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,632 psi | 50% | 2900 fps | 96.1% |
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 93 powders for .300 Blaser Mag. loaded with the .308 | 136gr | Geco ZERO. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,386 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,386 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 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 136.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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-17, ReloadSwiss RS 60, Alliant Reloder-16 rank at the top here: for .300 Blaser Mag. with the .308 | 136gr | Geco ZERO 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.