Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 165gr | Swift A-Frame bullet and 84 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP 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 2700 | <<locked>> | 82% | 53,621 psi | 88% | 2943 fps | 98.6% |
| Accurate 3100 | <<locked>> | 98% | 51,895 psi | 85% | 2989 fps | 99.5% |
| Accurate 4064 | <<locked>> | 82% | 53,156 psi | 87% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,853 psi | 88% | 3045 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 53,954 psi | 89% | 3133 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 84% | 53,026 psi | 87% | 2966 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,781 psi | 90% | 3087 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 98% | 52,446 psi | 86% | 3074 fps | 96.7% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,882 psi | 90% | 3084 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 53,940 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,085 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,621 psi | 90% | 3104 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 52,156 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,143 psi | 89% | 3074 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 51,488 psi | 85% | 3074 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,243 psi | 86% | 3064 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,455 psi | 75% | 2992 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 52,141 psi | 86% | 3150 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,502 psi | 83% | 3054 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 54,781 psi | 90% | 3005 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 51,488 psi | 85% | 3074 fps | 98% |
| Bofors RP7 | <<locked>> | 88% | 54,041 psi | 89% | 2989 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 55,056 psi | 90% | 3022 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 52,330 psi | 86% | 3038 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 86% | 52,199 psi | 86% | 2995 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 96% | 52,533 psi | 86% | 3018 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,056 psi | 90% | 3061 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,839 psi | 90% | 3018 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,367 psi | 73% | 3018 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 88% | 52,417 psi | 86% | 3071 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 60% | 1893 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,562 psi | 86% | 2946 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,911 psi | 90% | 2979 fps | 99.3% |
| IMR 4350 | <<locked>> | 90% | 51,793 psi | 85% | 2969 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,330 psi | 86% | 2963 fps | 98.9% |
| IMR 4831 | <<locked>> | 92% | 54,302 psi | 89% | 3035 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,244 psi | 89% | 3012 fps | 96.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,534 psi | 88% | 3110 fps | 97% |
| Lovex S062 | <<locked>> | 82% | 52,721 psi | 87% | 2940 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 52,518 psi | 86% | 2959 fps | 99.7% |
| Lovex S070 | <<locked>> | 90% | 53,751 psi | 88% | 3002 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,122 psi | 76% | 2890 fps | 98.8% |
| Norma 203B | <<locked>> | 82% | 53,388 psi | 88% | 2995 fps | 100% |
| Norma 204 | <<locked>> | 90% | 52,272 psi | 86% | 3018 fps | 97.7% |
| Norma MRP | <<locked>> | 98% | 54,969 psi | 90% | 3166 fps | 99.4% |
| Norma URP | <<locked>> | 90% | 52,562 psi | 86% | 3025 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,056 psi | 89% | 3022 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,998 psi | 89% | 3127 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 54,882 psi | 90% | 3084 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,414 psi | 79% | 2995 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,231 psi | 61% | 1942 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,868 psi | 90% | 3005 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 51,532 psi | 85% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,780 psi | 88% | 3064 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 52,098 psi | 86% | 3091 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,454 psi | 73% | 3015 fps | 98.1% |
| Rottweil R 902 | <<locked>> | 82% | 54,737 psi | 90% | 2953 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,853 psi | 90% | 3002 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 52,982 psi | 87% | 2999 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 96% | 53,548 psi | 88% | 3061 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 54,041 psi | 89% | 2989 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 52,518 psi | 86% | 2959 fps | 99.7% |
| Shooters World Precision | <<locked>> | 82% | 52,721 psi | 87% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,751 psi | 88% | 3002 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 52,750 psi | 87% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 52,431 psi | 86% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 52,156 psi | 86% | 2910 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,084 psi | 87% | 3058 fps | 98.2% |
| Somchem S355 | <<locked>> | 86% | 54,839 psi | 90% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,737 psi | 90% | 2992 fps | 96.4% |
| Somchem S365 | <<locked>> | 92% | 52,025 psi | 85% | 3031 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,230 psi | 89% | 3038 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 55,085 psi | 90% | 2910 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 52,562 psi | 86% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,636 psi | 90% | 3022 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,505 psi | 88% | 3009 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 53,519 psi | 88% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,737 psi | 88% | 3025 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,708 psi | 90% | 3091 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 51,416 psi | 84% | 3087 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,244 psi | 89% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,547 psi | 86% | 3041 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,471 psi | 78% | 3130 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,288 psi | 89% | 3028 fps | 98.2% |
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 2700 | <<locked>> | 80% | 50,285 psi | 83% | 2884 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 34,548 psi | 57% | 2641 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 49,980 psi | 82% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,130 psi | 63% | 2746 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 96% | 50,198 psi | 82% | 3064 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 46,949 psi | 77% | 2858 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,250 psi | 69% | 2844 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 49,211 psi | 81% | 3015 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 42,279 psi | 69% | 2844 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,514 psi | 78% | 2884 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,676 psi | 83% | 2953 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,115 psi | 61% | 2756 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,119 psi | 69% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,814 psi | 69% | 2835 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,264 psi | 69% | 2890 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,296 psi | 45% | 2500 fps | 96.4% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,895 psi | 54% | 2680 fps | 95.6% |
| Alliant Reloder-26 | 69.4 gr | 82% | 31,169 psi | 51% | 2674 fps | 95.8% |
| Bofors RP15 | <<locked>> | 94% | 41,655 psi | 68% | 2877 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 47,892 psi | 79% | 2894 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,264 psi | 69% | 2890 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 42,177 psi | 69% | 2762 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 48,269 psi | 79% | 2907 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 40,132 psi | 66% | 2795 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 42,960 psi | 71% | 2815 fps | 96% |
| Hodgdon H4831 | <<locked>> | 94% | 49,066 psi | 81% | 2956 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,648 psi | 85% | 3002 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,679 psi | 57% | 2644 fps | 99% |
| Hodgdon Retumbo | <<locked>> | 98% | 41,539 psi | 68% | 2953 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 39,117 psi | 64% | 2805 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,180 psi | 45% | 1693 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,400 psi | 81% | 2894 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,503 psi | 85% | 2923 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 37,768 psi | 62% | 2684 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,511 psi | 71% | 2795 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 36,651 psi | 60% | 2697 fps | 98.2% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,921 psi | 79% | 2897 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 46,905 psi | 77% | 2982 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 49,617 psi | 81% | 2890 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,104 psi | 67% | 2743 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 39,189 psi | 64% | 2720 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 33,504 psi | 55% | 2615 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 50,053 psi | 82% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 84% | 42,569 psi | 70% | 2831 fps | 95.3% |
| Norma MRP | 70.7 gr | 86% | 36,114 psi | 59% | 2776 fps | 95% |
| Norma URP | <<locked>> | 80% | 37,826 psi | 62% | 2740 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 50,444 psi | 83% | 2963 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 46,862 psi | 77% | 2995 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 36,796 psi | 60% | 2726 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 94% | 38,856 psi | 64% | 2795 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 45% | 1732 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,283 psi | 79% | 2890 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,730 psi | 73% | 2943 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,869 psi | 62% | 2762 fps | 98.2% |
| ReloadSwiss RS 70 | 67.1 gr | 80% | 36,724 psi | 60% | 2769 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 38,580 psi | 63% | 2867 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 51,488 psi | 85% | 2904 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,063 psi | 74% | 2838 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,630 psi | 77% | 2881 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 40,959 psi | 67% | 2818 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,177 psi | 69% | 2762 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,104 psi | 67% | 2743 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 49,617 psi | 81% | 2890 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,189 psi | 64% | 2720 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,296 psi | 76% | 2894 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,253 psi | 76% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,234 psi | 66% | 2684 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,582 psi | 67% | 2812 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 45,484 psi | 75% | 2841 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 51,155 psi | 84% | 2930 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 34,403 psi | 56% | 2697 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 38,986 psi | 64% | 2743 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 51,750 psi | 85% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,265 psi | 71% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,262 psi | 64% | 2736 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 41,002 psi | 67% | 2776 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 50,212 psi | 82% | 2871 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,798 psi | 64% | 2740 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 30,081 psi | 49% | 2579 fps | 96.5% |
| Vihtavuori N560 | <<locked>> | 94% | 48,095 psi | 79% | 3022 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,392 psi | 63% | 2707 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 40,132 psi | 66% | 2795 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,715 psi | 42% | 2526 fps | 96.2% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,930 psi | 67% | 2782 fps | 95% |
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 84 powders for .300 Blaser Mag. loaded with the .308 | 165gr | Swift A-Frame. Norma MRP delivers the highest muzzle velocity at 3,166 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,166 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 84 of the 84 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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-26, Norma MRP, ReloadSwiss RS 70 rank at the top here: for .300 Blaser Mag. with the .308 | 165gr | Swift A-Frame 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.