Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 165gr | Barnes MRX BT bullet and 91 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 Alliant Reloder-17.
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>> | 82% | 52,344 psi | 86% | 2871 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,230 psi | 89% | 2943 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,343 psi | 84% | 2979 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 52,895 psi | 87% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,548 psi | 88% | 3035 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 52,649 psi | 86% | 3127 fps | 97% |
| ADI AR 2208 | <<locked>> | 86% | 53,766 psi | 88% | 2969 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 51,605 psi | 85% | 3025 fps | 97.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,692 psi | 87% | 3071 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 52,591 psi | 86% | 3091 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,157 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,549 psi | 90% | 3015 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,766 psi | 90% | 3100 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 52,315 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,375 psi | 89% | 3071 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,329 psi | 84% | 3068 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,501 psi | 80% | 3002 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,134 psi | 69% | 2913 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 51,822 psi | 85% | 3143 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,065 psi | 77% | 2986 fps | 96.6% |
| Bofors RP3 | <<locked>> | 86% | 54,882 psi | 90% | 3005 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,329 psi | 84% | 3068 fps | 97.7% |
| Bofors RP7 | <<locked>> | 90% | 54,375 psi | 89% | 2986 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 84% | 51,735 psi | 85% | 2963 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 52,562 psi | 86% | 3038 fps | 99% |
| Hodgdon H4350 | <<locked>> | 88% | 52,547 psi | 86% | 2995 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,969 psi | 90% | 3018 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,069 psi | 87% | 3005 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 52,518 psi | 86% | 3068 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 59% | 1877 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,983 psi | 89% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,098 psi | 87% | 2949 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 52,243 psi | 86% | 2927 fps | 98.8% |
| IMR 4350 | <<locked>> | 92% | 51,996 psi | 85% | 2966 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 52,939 psi | 87% | 2966 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 54,273 psi | 89% | 3031 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 52,272 psi | 86% | 2986 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,694 psi | 90% | 3009 fps | 96.4% |
| Lovex S060 | <<locked>> | 82% | 54,607 psi | 90% | 2933 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,055 psi | 87% | 2940 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 52,692 psi | 87% | 2959 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 53,998 psi | 89% | 3002 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,467 psi | 70% | 2818 fps | 98% |
| Norma 201 | <<locked>> | 82% | 54,360 psi | 89% | 2953 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,114 psi | 90% | 2949 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,824 psi | 88% | 3002 fps | 100% |
| Norma 204 | <<locked>> | 92% | 52,634 psi | 86% | 3018 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 54,650 psi | 90% | 3159 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 52,707 psi | 87% | 3025 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,505 psi | 89% | 3025 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,183 psi | 82% | 3048 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 92% | 51,474 psi | 85% | 3022 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,657 psi | 73% | 2917 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,767 psi | 60% | 1923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 51,880 psi | 85% | 2949 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 51,837 psi | 85% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 53,708 psi | 88% | 3061 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 52,402 psi | 86% | 3091 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,104 psi | 67% | 2927 fps | 96.6% |
| Rottweil R 902 | <<locked>> | 84% | 55,100 psi | 90% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,998 psi | 90% | 3002 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 53,185 psi | 87% | 2995 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 98% | 53,330 psi | 88% | 3051 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 54,375 psi | 89% | 2986 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 52,692 psi | 87% | 2959 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 53,055 psi | 87% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,998 psi | 89% | 3002 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,156 psi | 87% | 3012 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,389 psi | 89% | 2986 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 52,881 psi | 87% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 52,518 psi | 86% | 2910 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 52,866 psi | 87% | 3045 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 55,027 psi | 90% | 2881 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,853 psi | 90% | 2995 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,013 psi | 90% | 2986 fps | 96.2% |
| Somchem S365 | <<locked>> | 94% | 51,808 psi | 85% | 3028 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,056 psi | 89% | 3028 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 52,054 psi | 85% | 2864 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 52,446 psi | 86% | 2881 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 52,982 psi | 87% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,766 psi | 90% | 3018 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,850 psi | 82% | 2943 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 84% | 53,867 psi | 88% | 2923 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,795 psi | 88% | 3022 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,085 psi | 89% | 3081 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,085 psi | 90% | 3146 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,534 psi | 90% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 52,779 psi | 87% | 3038 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,642 psi | 72% | 3054 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,346 psi | 89% | 2989 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,273 psi | 89% | 3022 fps | 97.9% |
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% | 48,950 psi | 80% | 2822 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,572 psi | 78% | 2828 fps | 97.4% |
| Accurate 3100 | <<locked>> | 88% | 33,649 psi | 55% | 2621 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 46,369 psi | 76% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,998 psi | 57% | 2674 fps | 97.5% |
| Accurate High Country | <<locked>> | 94% | 45,513 psi | 75% | 2992 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 44,353 psi | 73% | 2805 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 45,020 psi | 74% | 2897 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 98% | 49,269 psi | 81% | 3009 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,994 psi | 80% | 3025 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,614 psi | 73% | 2828 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,761 psi | 78% | 2900 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,577 psi | 57% | 2690 fps | 97.6% |
| Alliant Reloder-17 | 63.7 gr | 80% | 39,247 psi | 64% | 2825 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,742 psi | 69% | 2828 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,829 psi | 69% | 2877 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,760 psi | 44% | 2480 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,430 psi | 53% | 2664 fps | 95.1% |
| Alliant Reloder-26 | 68.5 gr | 84% | 30,647 psi | 50% | 2657 fps | 95.2% |
| Bofors RP15 | <<locked>> | 98% | 44,019 psi | 72% | 2923 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 44,759 psi | 73% | 2838 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,829 psi | 69% | 2877 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 39,552 psi | 65% | 2700 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 45,194 psi | 74% | 2848 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 37,304 psi | 61% | 2726 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 43,149 psi | 71% | 2815 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,981 psi | 53% | 2579 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,487 psi | 81% | 2949 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,102 psi | 64% | 2799 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,977 psi | 44% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,633 psi | 83% | 2917 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,644 psi | 77% | 2838 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,037 psi | 81% | 2871 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 40,277 psi | 66% | 2736 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,118 psi | 68% | 2736 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 33,837 psi | 56% | 2628 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 48,994 psi | 80% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,343 psi | 84% | 2953 fps | 95.6% |
| Lovex S060 | <<locked>> | 80% | 51,517 psi | 85% | 2884 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,818 psi | 77% | 2838 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,450 psi | 63% | 2684 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 36,709 psi | 60% | 2657 fps | 95.4% |
| Lovex S071 | <<locked>> | 94% | 34,795 psi | 57% | 2651 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 50,981 psi | 84% | 2900 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,648 psi | 85% | 2897 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,123 psi | 77% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,728 psi | 70% | 2828 fps | 95.1% |
| Norma MRP | <<locked>> | 90% | 38,319 psi | 63% | 2831 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 35,244 psi | 58% | 2677 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 80% | 47,500 psi | 78% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,804 psi | 77% | 2982 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 34,127 psi | 56% | 2657 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 98% | 41,452 psi | 68% | 2848 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,412 psi | 45% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,513 psi | 75% | 2835 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,771 psi | 69% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,882 psi | 57% | 2690 fps | 97.1% |
| ReloadSwiss RS 70 | 64.7 gr | 80% | 34,243 psi | 56% | 2700 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 38,159 psi | 63% | 2851 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 48,428 psi | 80% | 2848 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,119 psi | 69% | 2782 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 46,673 psi | 77% | 2874 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 43,555 psi | 72% | 2871 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 39,552 psi | 65% | 2700 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,450 psi | 63% | 2684 fps | 97.2% |
| Shooters World Precision | <<locked>> | 80% | 46,818 psi | 77% | 2838 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,709 psi | 60% | 2657 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,381 psi | 71% | 2838 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,850 psi | 83% | 2930 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,758 psi | 72% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,710 psi | 62% | 2621 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,149 psi | 71% | 2864 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 51,692 psi | 85% | 2831 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,540 psi | 70% | 2782 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 51,445 psi | 84% | 2927 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 31,604 psi | 52% | 2628 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 38,551 psi | 63% | 2733 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 48,660 psi | 80% | 2815 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,153 psi | 81% | 2831 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,683 psi | 67% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,579 psi | 60% | 2677 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 40,582 psi | 67% | 2766 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 47,297 psi | 78% | 2822 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,984 psi | 59% | 2674 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 82% | 29,254 psi | 48% | 2559 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 98% | 51,343 psi | 84% | 3077 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,882 psi | 59% | 2648 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 37,478 psi | 62% | 2730 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,092 psi | 41% | 2500 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,778 psi | 83% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,888 psi | 72% | 2838 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 91 powders for .300 Blaser Mag. loaded with the .308 | 165gr | Barnes MRX BT. Norma MRP delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,159 fps. Accurate 3100 gives the best case fill at 100 %, and 91 of the 91 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 165.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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, Alliant Reloder-17 rank at the top here: for .300 Blaser Mag. with the .308 | 165gr | Barnes MRX BT 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.