Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 165gr | Swift Scirocco bullet and 84 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.
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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% | 53,780 psi | 88% | 2884 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,056 psi | 90% | 2949 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,475 psi | 86% | 2989 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 54,230 psi | 89% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,810 psi | 90% | 3048 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,418 psi | 89% | 2972 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 52,243 psi | 86% | 3028 fps | 97.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,388 psi | 88% | 3077 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,374 psi | 88% | 3094 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,042 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 52,025 psi | 85% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 52,069 psi | 85% | 3051 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 52,997 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,998 psi | 90% | 3074 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,127 psi | 86% | 3074 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,284 psi | 81% | 3009 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,946 psi | 71% | 2927 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,765 psi | 87% | 3153 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,848 psi | 79% | 2995 fps | 96.8% |
| Bofors RP3 | <<locked>> | 84% | 52,243 psi | 86% | 2956 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,127 psi | 86% | 3074 fps | 97.8% |
| Bofors RP7 | <<locked>> | 88% | 52,098 psi | 86% | 2940 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 84% | 52,692 psi | 87% | 2972 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 53,490 psi | 88% | 3045 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 53,301 psi | 88% | 2999 fps | 98% |
| Hodgdon H4831 | <<locked>> | 98% | 53,592 psi | 88% | 3018 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 52,301 psi | 86% | 2972 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 53,896 psi | 88% | 3012 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 53,476 psi | 88% | 3081 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,260 psi | 60% | 1873 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,868 psi | 90% | 2979 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 53,809 psi | 88% | 2953 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,127 psi | 87% | 2936 fps | 98.9% |
| IMR 4350 | <<locked>> | 92% | 52,794 psi | 87% | 2972 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 53,650 psi | 88% | 2969 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 55,085 psi | 90% | 3035 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,374 psi | 88% | 2995 fps | 100% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,010 psi | 84% | 3048 fps | 96.1% |
| Lovex S062 | <<locked>> | 84% | 53,954 psi | 89% | 2946 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 53,635 psi | 88% | 2966 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 54,795 psi | 90% | 3009 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,555 psi | 72% | 2831 fps | 98.2% |
| Norma 203B | <<locked>> | 84% | 54,679 psi | 90% | 3005 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,476 psi | 88% | 3025 fps | 97.6% |
| Norma MRP | <<locked>> | 98% | 51,677 psi | 85% | 3100 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 53,417 psi | 88% | 3028 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 51,735 psi | 85% | 2972 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,227 psi | 84% | 3061 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 92% | 52,402 psi | 86% | 3031 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,600 psi | 75% | 2927 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,927 psi | 61% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 52,750 psi | 87% | 2956 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,460 psi | 86% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,592 psi | 90% | 3071 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,113 psi | 87% | 3097 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,018 psi | 69% | 2943 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 82% | 52,576 psi | 86% | 2907 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 52,562 psi | 86% | 2956 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,027 psi | 89% | 2999 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 98% | 54,317 psi | 89% | 3061 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 52,098 psi | 86% | 2940 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 53,635 psi | 88% | 2966 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 53,954 psi | 89% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,795 psi | 90% | 3009 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,012 psi | 89% | 3015 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 53,563 psi | 88% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,272 psi | 87% | 2913 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,838 psi | 88% | 3054 fps | 98.1% |
| Somchem S355 | <<locked>> | 86% | 52,620 psi | 86% | 2953 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 52,562 psi | 86% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,882 psi | 90% | 3035 fps | 98.8% |
| Vihtavuori N135 | <<locked>> | 82% | 52,910 psi | 87% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,229 psi | 87% | 2884 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 53,867 psi | 88% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 52,214 psi | 86% | 2972 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,647 psi | 83% | 2949 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 54,694 psi | 90% | 2930 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,781 psi | 90% | 3031 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 51,764 psi | 85% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 52,098 psi | 86% | 3087 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 51,793 psi | 85% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 53,490 psi | 88% | 3045 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,541 psi | 73% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 51,416 psi | 84% | 2969 fps | 97.4% |
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% | 50,357 psi | 83% | 2831 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,370 psi | 79% | 2835 fps | 97.5% |
| Accurate 3100 | <<locked>> | 88% | 34,867 psi | 57% | 2644 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 47,688 psi | 78% | 2838 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,143 psi | 59% | 2690 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 45,208 psi | 74% | 2812 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 42,960 psi | 71% | 2848 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 98% | 49,951 psi | 82% | 3012 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,748 psi | 82% | 3035 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,658 psi | 75% | 2841 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,588 psi | 80% | 2907 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,520 psi | 58% | 2707 fps | 97.9% |
| Alliant Reloder-17 | 63.3 gr | 80% | 40,103 psi | 66% | 2838 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,583 psi | 70% | 2841 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,786 psi | 70% | 2894 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,904 psi | 43% | 2444 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,359 psi | 55% | 2680 fps | 95.5% |
| Alliant Reloder-26 | 68.1 gr | 84% | 31,691 psi | 52% | 2680 fps | 95.7% |
| Bofors RP15 | <<locked>> | 96% | 42,003 psi | 69% | 2874 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 45,818 psi | 75% | 2851 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,786 psi | 70% | 2894 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 40,408 psi | 66% | 2710 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 46,325 psi | 76% | 2861 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 38,189 psi | 63% | 2743 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 41,191 psi | 68% | 2762 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 96% | 50,169 psi | 82% | 2963 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,996 psi | 54% | 2595 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,328 psi | 83% | 2956 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,001 psi | 66% | 2812 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 44% | 1673 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,271 psi | 84% | 2920 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,543 psi | 78% | 2848 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,705 psi | 82% | 2874 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 38,522 psi | 63% | 2690 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,800 psi | 69% | 2743 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 34,983 psi | 57% | 2648 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 49,850 psi | 82% | 2936 fps | 100% |
| IMR 7828 SSC | <<locked>> | 98% | 47,514 psi | 78% | 2979 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 47,718 psi | 78% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,349 psi | 65% | 2694 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 37,652 psi | 62% | 2671 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 33,634 psi | 55% | 2612 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 47,964 psi | 79% | 2894 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,555 psi | 72% | 2838 fps | 95.3% |
| Norma MRP | <<locked>> | 90% | 39,146 psi | 64% | 2841 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 36,143 psi | 59% | 2690 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 48,356 psi | 79% | 2917 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,601 psi | 78% | 2989 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 34,998 psi | 57% | 2671 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 96% | 39,378 psi | 65% | 2795 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,528 psi | 45% | 1716 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,340 psi | 76% | 2841 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,598 psi | 70% | 2894 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,897 psi | 59% | 2710 fps | 97.4% |
| ReloadSwiss RS 70 | 64.3 gr | 80% | 35,085 psi | 58% | 2713 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,073 psi | 64% | 2867 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 49,588 psi | 81% | 2858 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,149 psi | 71% | 2792 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,514 psi | 78% | 2884 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 41,626 psi | 68% | 2822 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 40,408 psi | 66% | 2710 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,349 psi | 65% | 2694 fps | 97.4% |
| Shooters World Precision | <<locked>> | 80% | 47,718 psi | 78% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,652 psi | 62% | 2671 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,193 psi | 73% | 2848 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,643 psi | 73% | 2703 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,609 psi | 63% | 2638 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,234 psi | 68% | 2818 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 43,468 psi | 71% | 2792 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 32,547 psi | 53% | 2644 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 39,581 psi | 65% | 2746 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 49,777 psi | 82% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,951 psi | 82% | 2835 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,553 psi | 68% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,420 psi | 61% | 2687 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 41,524 psi | 68% | 2779 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 48,327 psi | 79% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,057 psi | 61% | 2694 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 28,398 psi | 47% | 2526 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 96% | 48,820 psi | 80% | 3025 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,695 psi | 60% | 2657 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 38,334 psi | 63% | 2743 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,063 psi | 43% | 2530 fps | 96.1% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,672 psi | 73% | 2844 fps | 95.8% |
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 Scirocco. Alliant Reloder-26 delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,873 fps to 3,153 fps. Accurate 3100 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 1:11.5 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 | Swift Scirocco 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.