Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 165gr | Geco STAR bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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>> | 82% | 53,171 psi | 87% | 2887 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 51,459 psi | 84% | 2904 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,562 psi | 86% | 3002 fps | 99.5% |
| Accurate 4064 | <<locked>> | 84% | 53,693 psi | 88% | 2946 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,737 psi | 90% | 3058 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 53,853 psi | 88% | 3150 fps | 97.3% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,853 psi | 90% | 3146 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 86% | 54,418 psi | 89% | 2986 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 52,547 psi | 86% | 3048 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,737 psi | 88% | 3094 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,577 psi | 88% | 3107 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 52,562 psi | 86% | 3045 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,100 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 51,880 psi | 85% | 2976 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 52,359 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,214 psi | 87% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 51,851 psi | 85% | 3031 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,489 psi | 86% | 3091 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,458 psi | 81% | 3022 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,076 psi | 71% | 2940 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,011 psi | 87% | 3163 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,935 psi | 79% | 3005 fps | 96.9% |
| Bofors RP3 | <<locked>> | 84% | 52,112 psi | 86% | 2966 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,489 psi | 86% | 3091 fps | 98% |
| Bofors RP7 | <<locked>> | 88% | 52,025 psi | 85% | 2953 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 84% | 52,605 psi | 86% | 2982 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 53,606 psi | 88% | 3058 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 53,577 psi | 88% | 3018 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 98% | 54,012 psi | 89% | 3041 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,852 psi | 87% | 3022 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 52,489 psi | 86% | 2986 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,012 psi | 89% | 3025 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,693 psi | 88% | 3094 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 59% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,897 psi | 90% | 2989 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,809 psi | 88% | 2966 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,055 psi | 87% | 2946 fps | 99% |
| IMR 4350 | <<locked>> | 92% | 52,939 psi | 87% | 2986 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,722 psi | 88% | 2982 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 51,663 psi | 85% | 2992 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,258 psi | 87% | 3005 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,156 psi | 86% | 2972 fps | 96% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,111 psi | 84% | 3061 fps | 96.3% |
| Lovex S062 | <<locked>> | 84% | 53,969 psi | 89% | 2959 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,693 psi | 88% | 2979 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 54,752 psi | 90% | 3022 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,424 psi | 71% | 2841 fps | 98.3% |
| Norma 203B | <<locked>> | 84% | 54,549 psi | 90% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,563 psi | 88% | 3038 fps | 97.8% |
| Norma MRP | <<locked>> | 98% | 51,996 psi | 85% | 3117 fps | 99% |
| Norma URP | <<locked>> | 92% | 53,577 psi | 88% | 3041 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 51,793 psi | 85% | 2986 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,503 psi | 85% | 3081 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 92% | 52,446 psi | 86% | 3041 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,788 psi | 75% | 2946 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,782 psi | 60% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 52,707 psi | 87% | 2969 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,765 psi | 87% | 3081 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,781 psi | 90% | 3084 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,374 psi | 88% | 3114 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,076 psi | 69% | 2956 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 52,388 psi | 86% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 52,417 psi | 86% | 2966 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,128 psi | 89% | 3015 fps | 97% |
| Rottweil R 905 | <<locked>> | 98% | 54,578 psi | 90% | 3077 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 52,025 psi | 85% | 2953 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,693 psi | 88% | 2979 fps | 99.7% |
| Shooters World Precision | <<locked>> | 84% | 53,969 psi | 89% | 2959 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,752 psi | 90% | 3022 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 53,998 psi | 89% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,766 psi | 88% | 2854 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,243 psi | 87% | 2927 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,099 psi | 89% | 3074 fps | 98.2% |
| Somchem S355 | <<locked>> | 86% | 52,373 psi | 86% | 2963 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 52,953 psi | 87% | 3048 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 51,517 psi | 85% | 2992 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 82% | 52,910 psi | 87% | 2881 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,156 psi | 87% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,824 psi | 88% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 52,344 psi | 86% | 2986 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,952 psi | 84% | 2966 fps | 98% |
| Vihtavuori N540 | <<locked>> | 84% | 54,723 psi | 90% | 2940 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,013 psi | 90% | 3045 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 51,837 psi | 85% | 3048 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 52,417 psi | 86% | 3104 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 52,025 psi | 85% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,838 psi | 88% | 3061 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,614 psi | 73% | 3077 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 51,721 psi | 85% | 2986 fps | 97.6% |
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% | 49,792 psi | 82% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,138 psi | 79% | 2844 fps | 97.6% |
| Accurate 3100 | <<locked>> | 88% | 34,403 psi | 56% | 2644 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 47,181 psi | 77% | 2844 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,723 psi | 59% | 2694 fps | 97.8% |
| Accurate High Country | 75.7 gr | 94% | 46,659 psi | 77% | 3018 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 98% | 51,097 psi | 84% | 3081 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 45,049 psi | 74% | 2822 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,033 psi | 71% | 2861 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 96% | 46,891 psi | 77% | 2966 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,937 psi | 82% | 3048 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 43,149 psi | 71% | 2861 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,339 psi | 74% | 2844 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,501 psi | 80% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,201 psi | 58% | 2710 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,045 psi | 66% | 2844 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,598 psi | 70% | 2851 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,670 psi | 70% | 2900 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,527 psi | 42% | 2441 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,112 psi | 54% | 2687 fps | 95.6% |
| Alliant Reloder-26 | 69.7 gr | 84% | 31,386 psi | 52% | 2684 fps | 95.8% |
| Bofors RP15 | <<locked>> | 96% | 42,076 psi | 69% | 2884 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 45,498 psi | 75% | 2854 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,670 psi | 70% | 2900 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 40,161 psi | 66% | 2720 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 46,079 psi | 76% | 2867 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 38,116 psi | 63% | 2749 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 41,060 psi | 67% | 2776 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 96% | 50,343 psi | 83% | 2976 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,240 psi | 81% | 2956 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,634 psi | 54% | 2598 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,459 psi | 83% | 2969 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,943 psi | 66% | 2822 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,963 psi | 44% | 1683 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,329 psi | 84% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,369 psi | 78% | 2858 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,864 psi | 82% | 2890 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 38,319 psi | 63% | 2700 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,742 psi | 69% | 2756 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 34,505 psi | 57% | 2648 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 49,763 psi | 82% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,008 psi | 80% | 2917 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 47,834 psi | 79% | 2999 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 47,558 psi | 78% | 2854 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,073 psi | 64% | 2700 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 37,318 psi | 61% | 2677 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 33,170 psi | 54% | 2612 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 47,834 psi | 79% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,453 psi | 71% | 2848 fps | 95.4% |
| Norma MRP | 70.9 gr | 88% | 36,535 psi | 60% | 2789 fps | 95% |
| Norma URP | <<locked>> | 80% | 35,897 psi | 59% | 2694 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 48,370 psi | 79% | 2930 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,805 psi | 78% | 3009 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 34,867 psi | 57% | 2680 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 96% | 39,363 psi | 65% | 2805 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,398 psi | 45% | 1726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,137 psi | 76% | 2851 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,656 psi | 70% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,665 psi | 59% | 2713 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 34,896 psi | 57% | 2723 fps | 96.8% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,059 psi | 64% | 2881 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 49,197 psi | 81% | 2867 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,873 psi | 70% | 2799 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,616 psi | 78% | 2897 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 41,423 psi | 68% | 2831 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 40,161 psi | 66% | 2720 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,073 psi | 64% | 2700 fps | 97.4% |
| Shooters World Precision | <<locked>> | 80% | 47,558 psi | 78% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,318 psi | 61% | 2677 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,237 psi | 73% | 2858 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,483 psi | 73% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,261 psi | 63% | 2641 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,060 psi | 67% | 2825 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 43,250 psi | 71% | 2802 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 32,242 psi | 53% | 2644 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 39,450 psi | 65% | 2756 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 49,545 psi | 81% | 2831 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,879 psi | 82% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,350 psi | 68% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,217 psi | 61% | 2694 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 41,611 psi | 68% | 2792 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 48,124 psi | 79% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,767 psi | 60% | 2697 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 27,876 psi | 46% | 2520 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 96% | 48,907 psi | 80% | 3038 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,521 psi | 60% | 2664 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 38,116 psi | 63% | 2749 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 25,585 psi | 42% | 2526 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,640 psi | 68% | 2799 fps | 95.1% |
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 89 powders for .300 Blaser Mag. loaded with the .308 | 165gr | Geco STAR. Alliant Reloder-26 delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,163 fps. Accurate 3100 gives the best case fill at 100 %, and 89 of the 89 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 1:13.0 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for .300 Blaser Mag. with the .308 | 165gr | Geco STAR 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.