Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 155gr | Frontier RSBT bullet and 88 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-16 and Alliant Reloder-26.
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 2495 | <<locked>> | 84% | 54,955 psi | 90% | 2992 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 53,127 psi | 87% | 2999 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,980 psi | 82% | 3031 fps | 98.8% |
| Accurate 4064 | <<locked>> | 84% | 51,866 psi | 85% | 2999 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 52,214 psi | 86% | 3094 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 54,549 psi | 90% | 3077 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 52,359 psi | 86% | 3028 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 98% | 53,374 psi | 88% | 3130 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,824 psi | 90% | 3212 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 52,982 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,142 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 53,185 psi | 87% | 3156 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,186 psi | 89% | 3186 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 52,562 psi | 86% | 3117 fps | 97.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,748 psi | 82% | 3114 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,804 psi | 77% | 3054 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,104 psi | 67% | 2959 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,809 psi | 88% | 3258 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,375 psi | 89% | 3091 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 53,722 psi | 88% | 3071 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,748 psi | 82% | 3114 fps | 96.7% |
| Bofors RP7 | <<locked>> | 90% | 53,258 psi | 87% | 3045 fps | 98% |
| Hodgdon H380 | <<locked>> | 86% | 54,244 psi | 89% | 3084 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 54,549 psi | 90% | 3146 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 54,578 psi | 90% | 3104 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,388 psi | 88% | 3077 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 51,706 psi | 85% | 3068 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,868 psi | 90% | 3186 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 59% | 1932 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 52,779 psi | 87% | 3035 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 51,967 psi | 85% | 3012 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,708 psi | 90% | 3045 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 53,983 psi | 89% | 3074 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,056 psi | 90% | 3077 fps | 98.7% |
| IMR 4831 | <<locked>> | 94% | 52,620 psi | 86% | 3084 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 54,491 psi | 89% | 3104 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,839 psi | 90% | 3048 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,563 psi | 88% | 2995 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 52,025 psi | 85% | 3005 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,940 psi | 90% | 3071 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 52,576 psi | 86% | 3054 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,307 psi | 68% | 2864 fps | 97% |
| Norma 201 | <<locked>> | 82% | 53,432 psi | 88% | 3022 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,983 psi | 89% | 3018 fps | 100% |
| Norma 203B | <<locked>> | 84% | 52,446 psi | 86% | 3058 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,592 psi | 90% | 3127 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 52,852 psi | 87% | 3205 fps | 98.6% |
| Norma URP | <<locked>> | 94% | 54,520 psi | 90% | 3136 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 53,084 psi | 87% | 3084 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 53,345 psi | 88% | 3130 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,782 psi | 60% | 1978 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,288 psi | 89% | 3064 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,780 psi | 88% | 3143 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,679 psi | 88% | 3179 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 51,909 psi | 85% | 3114 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,534 psi | 90% | 3209 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 53,925 psi | 89% | 3018 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,592 psi | 88% | 3061 fps | 100% |
| Rottweil R 905 | <<locked>> | 98% | 51,779 psi | 85% | 3100 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 90% | 53,258 psi | 87% | 3045 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,940 psi | 90% | 3071 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,839 psi | 90% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 52,025 psi | 85% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 52,576 psi | 86% | 3054 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 51,779 psi | 85% | 3068 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 52,939 psi | 87% | 3045 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,259 psi | 89% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,013 psi | 90% | 2946 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,636 psi | 90% | 3018 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,824 psi | 90% | 3156 fps | 97.7% |
| Somchem S335 | <<locked>> | 82% | 54,099 psi | 89% | 2946 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,708 psi | 88% | 3058 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 53,388 psi | 88% | 3136 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 52,605 psi | 86% | 3081 fps | 98% |
| Vihtavuori N133 | <<locked>> | 82% | 54,679 psi | 90% | 2930 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,186 psi | 89% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,462 psi | 89% | 2995 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,984 psi | 90% | 3031 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 53,287 psi | 87% | 3074 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,399 psi | 79% | 2989 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 84% | 52,765 psi | 87% | 2989 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 52,460 psi | 86% | 3081 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,431 psi | 86% | 3140 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,040 psi | 87% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,781 psi | 90% | 3153 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,192 psi | 69% | 3097 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,084 psi | 87% | 3054 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,634 psi | 86% | 3068 fps | 97% |
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% | 48,399 psi | 79% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,499 psi | 76% | 2877 fps | 96.4% |
| Accurate 3100 | <<locked>> | 90% | 35,404 psi | 58% | 2730 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 45,788 psi | 75% | 2897 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,403 psi | 56% | 2726 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 80% | 51,227 psi | 84% | 3022 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,497 psi | 71% | 2861 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 46,847 psi | 77% | 3005 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,659 psi | 78% | 3084 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,714 psi | 72% | 2887 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,818 psi | 77% | 2959 fps | 99.6% |
| Alliant Reloder-16 | 59.1 gr | 80% | 33,953 psi | 56% | 2740 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,305 psi | 63% | 2877 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,282 psi | 76% | 2995 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,572 psi | 76% | 3051 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,065 psi | 46% | 2585 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,085 psi | 59% | 2828 fps | 95.9% |
| Alliant Reloder-26 | 70.1 gr | 86% | 32,227 psi | 53% | 2769 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,937 psi | 84% | 3031 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 43,990 psi | 72% | 2900 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 46,572 psi | 76% | 3051 fps | 95.9% |
| Bofors RP7 | <<locked>> | 82% | 41,510 psi | 68% | 2812 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 44,367 psi | 73% | 2904 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 38,957 psi | 64% | 2838 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 44,991 psi | 74% | 2923 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,415 psi | 52% | 2628 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,269 psi | 79% | 3009 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 41,104 psi | 67% | 2913 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 44% | 1729 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,530 psi | 81% | 2979 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,730 psi | 75% | 2897 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,124 psi | 79% | 2927 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 42,003 psi | 69% | 2844 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,364 psi | 66% | 2789 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 33,228 psi | 55% | 2680 fps | 96.2% |
| IMR 4895 | <<locked>> | 80% | 47,993 psi | 79% | 2992 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 51,198 psi | 84% | 2992 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,328 psi | 83% | 2943 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,818 psi | 75% | 2897 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,884 psi | 62% | 2736 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 38,377 psi | 63% | 2766 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 36,361 psi | 60% | 2753 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 50,154 psi | 82% | 2966 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,662 psi | 83% | 2966 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,166 psi | 76% | 2946 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 47,718 psi | 78% | 3002 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 39,929 psi | 66% | 2936 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 34,374 psi | 56% | 2723 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 46,340 psi | 76% | 2966 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 35,679 psi | 59% | 2766 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,296 psi | 45% | 1768 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,469 psi | 73% | 2884 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,343 psi | 83% | 3084 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,741 psi | 67% | 2943 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,113 psi | 56% | 2743 fps | 96.1% |
| ReloadSwiss RS 70 | 64.7 gr | 80% | 33,634 psi | 55% | 2743 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 47,703 psi | 78% | 2913 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,234 psi | 68% | 2838 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 94% | 45,295 psi | 74% | 2979 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 41,510 psi | 68% | 2812 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,884 psi | 62% | 2736 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,198 psi | 84% | 2992 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,818 psi | 75% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,377 psi | 63% | 2766 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,380 psi | 70% | 2894 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,763 psi | 82% | 2989 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,053 psi | 84% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,946 psi | 71% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,494 psi | 65% | 2730 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,875 psi | 74% | 2972 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 50,821 psi | 83% | 2897 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,800 psi | 69% | 2841 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,995 psi | 51% | 2677 fps | 98.6% |
| Somchem S385 | <<locked>> | 92% | 43,149 psi | 71% | 2900 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 51,517 psi | 85% | 2884 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,718 psi | 78% | 2881 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,993 psi | 79% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,769 psi | 65% | 2766 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,795 psi | 59% | 2726 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 96% | 42,235 psi | 69% | 2867 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 46,398 psi | 76% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,302 psi | 58% | 2726 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 30,748 psi | 50% | 2671 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,201 psi | 58% | 2697 fps | 98.7% |
| Winchester 760 | <<locked>> | 82% | 39,146 psi | 64% | 2841 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,571 psi | 44% | 2612 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,617 psi | 81% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,745 psi | 75% | 2943 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 104 powders for .300 Blaser Mag. loaded with the .308 | 155gr | Frontier RSBT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,258 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 59–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:10.5 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-16, Alliant Reloder-26 rank at the top here: for .300 Blaser Mag. with the .308 | 155gr | Frontier RSBT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Hodgdon H1000, Hodgdon Retumbo 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.