Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 180gr | 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 Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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% | 53,809 psi | 88% | 2815 fps | 99% |
| Accurate 3100 | <<locked>> | 98% | 51,982 psi | 85% | 2864 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 53,258 psi | 87% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,056 psi | 89% | 2913 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 53,751 psi | 88% | 3002 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 53,272 psi | 87% | 2831 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,853 psi | 90% | 2956 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 98% | 52,620 psi | 86% | 2953 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,056 psi | 89% | 2854 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,128 psi | 89% | 2874 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,781 psi | 90% | 2969 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 52,170 psi | 86% | 2933 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,244 psi | 89% | 2946 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 51,735 psi | 85% | 2949 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,083 psi | 86% | 2930 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,411 psi | 75% | 2867 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 52,025 psi | 85% | 3018 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,720 psi | 83% | 2930 fps | 98.2% |
| Bofors RP3 | <<locked>> | 84% | 54,911 psi | 90% | 2871 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 51,735 psi | 85% | 2949 fps | 98.5% |
| Bofors RP7 | <<locked>> | 88% | 54,288 psi | 89% | 2861 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,078 psi | 74% | 2802 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 82% | 51,793 psi | 85% | 2838 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 52,547 psi | 86% | 2910 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 52,315 psi | 86% | 2864 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 96% | 52,591 psi | 86% | 2890 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 51,619 psi | 85% | 2877 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 51,576 psi | 85% | 2838 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,469 psi | 73% | 2904 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 88% | 52,475 psi | 86% | 2943 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 60% | 1791 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,808 psi | 87% | 2815 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,042 psi | 90% | 2848 fps | 99.5% |
| IMR 4350 | <<locked>> | 90% | 51,880 psi | 85% | 2841 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,446 psi | 86% | 2831 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 54,433 psi | 89% | 2904 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,302 psi | 89% | 2884 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,621 psi | 88% | 2982 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 52,982 psi | 87% | 2808 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 52,779 psi | 87% | 2835 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 53,824 psi | 88% | 2874 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,108 psi | 76% | 2766 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 53,432 psi | 88% | 2861 fps | 100% |
| Norma 204 | <<locked>> | 90% | 52,286 psi | 86% | 2890 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 54,781 psi | 90% | 3031 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 52,649 psi | 86% | 2894 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,230 psi | 89% | 2887 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,940 psi | 89% | 2999 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 55,114 psi | 90% | 2953 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,341 psi | 79% | 2874 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,217 psi | 61% | 1834 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,998 psi | 90% | 2874 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 51,793 psi | 85% | 2927 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,708 psi | 88% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 52,170 psi | 86% | 2959 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,411 psi | 73% | 2897 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 82% | 54,969 psi | 90% | 2818 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,013 psi | 90% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 52,997 psi | 87% | 2871 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 96% | 53,606 psi | 88% | 2933 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 88% | 54,288 psi | 89% | 2861 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 52,779 psi | 87% | 2835 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 52,982 psi | 87% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,824 psi | 88% | 2874 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 52,881 psi | 87% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 52,431 psi | 86% | 2700 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 52,112 psi | 86% | 2782 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 53,142 psi | 87% | 2927 fps | 98.6% |
| Somchem S355 | <<locked>> | 86% | 54,882 psi | 90% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,810 psi | 90% | 2864 fps | 97% |
| Somchem S365 | <<locked>> | 92% | 52,141 psi | 86% | 2897 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,230 psi | 89% | 2907 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 86% | 52,692 psi | 87% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,824 psi | 90% | 2890 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,534 psi | 88% | 2881 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 53,693 psi | 88% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,867 psi | 88% | 2894 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,868 psi | 90% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,998 psi | 90% | 3022 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,094 psi | 77% | 2871 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,215 psi | 89% | 2851 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,794 psi | 87% | 2913 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,398 psi | 78% | 3002 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,099 psi | 89% | 2897 fps | 98.5% |
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% | 2756 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 32,271 psi | 53% | 2477 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 50,125 psi | 82% | 2753 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,406 psi | 63% | 2635 fps | 99% |
| Accurate MAGPRO | <<locked>> | 96% | 50,212 psi | 82% | 2943 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 47,036 psi | 77% | 2730 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 39,711 psi | 65% | 2667 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 94% | 46,006 psi | 76% | 2828 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,674 psi | 78% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,952 psi | 84% | 2825 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,202 psi | 61% | 2641 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,351 psi | 70% | 2766 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,334 psi | 65% | 2664 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,566 psi | 65% | 2713 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,383 psi | 45% | 2402 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,966 psi | 51% | 2516 fps | 95.5% |
| Alliant Reloder-26 | 63.6 gr | 80% | 29,182 psi | 48% | 2510 fps | 95.6% |
| Bofors RP15 | <<locked>> | 92% | 39,044 psi | 64% | 2700 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 48,066 psi | 79% | 2766 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,566 psi | 65% | 2713 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 42,293 psi | 69% | 2644 fps | 97.1% |
| Hodgdon H1000 | <<locked>> | 98% | 42,134 psi | 69% | 2740 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 48,501 psi | 80% | 2782 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 40,205 psi | 66% | 2677 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 43,120 psi | 71% | 2697 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 94% | 49,153 psi | 81% | 2835 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,298 psi | 79% | 2818 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,751 psi | 57% | 2530 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,059 psi | 64% | 2776 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 39,160 psi | 64% | 2687 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 45% | 1601 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,458 psi | 81% | 2762 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,634 psi | 85% | 2792 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 37,826 psi | 62% | 2569 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,700 psi | 72% | 2674 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 36,840 psi | 60% | 2585 fps | 98.7% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,037 psi | 79% | 2776 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 43,845 psi | 72% | 2799 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 49,893 psi | 82% | 2759 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,220 psi | 68% | 2625 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 39,392 psi | 65% | 2605 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 31,372 psi | 52% | 2454 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 50,328 psi | 83% | 2812 fps | 100% |
| Norma 204 | <<locked>> | 82% | 39,900 psi | 66% | 2654 fps | 95.1% |
| Norma MRP | 66.4 gr | 86% | 36,216 psi | 59% | 2667 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 38,029 psi | 62% | 2625 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 50,604 psi | 83% | 2831 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 43,555 psi | 72% | 2805 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 36,883 psi | 61% | 2612 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 94% | 38,841 psi | 64% | 2684 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,775 psi | 46% | 1640 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,254 psi | 79% | 2762 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,991 psi | 74% | 2815 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,087 psi | 63% | 2651 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,854 psi | 61% | 2657 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 35,940 psi | 59% | 2690 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 51,547 psi | 85% | 2769 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,266 psi | 74% | 2713 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 43,918 psi | 72% | 2703 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 38,363 psi | 63% | 2644 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 42,293 psi | 69% | 2644 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,220 psi | 68% | 2625 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 49,893 psi | 82% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,392 psi | 65% | 2605 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,441 psi | 76% | 2769 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,354 psi | 76% | 2612 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,306 psi | 66% | 2569 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 40,683 psi | 67% | 2697 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 45,585 psi | 75% | 2713 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 47,906 psi | 79% | 2749 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 34,476 psi | 57% | 2582 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 36,593 psi | 60% | 2575 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 43,468 psi | 71% | 2641 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,508 psi | 65% | 2625 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 38,493 psi | 63% | 2608 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 50,430 psi | 83% | 2743 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,001 psi | 64% | 2628 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 30,226 psi | 50% | 2477 fps | 97.3% |
| Vihtavuori N560 | 71 gr | 92% | 44,933 psi | 74% | 2838 fps | 95% |
| Vihtavuori N565 | <<locked>> | 98% | 43,801 psi | 72% | 2805 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,595 psi | 63% | 2592 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 40,408 psi | 66% | 2680 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,192 psi | 40% | 2372 fps | 96.1% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,089 psi | 67% | 2667 fps | 95.7% |
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 | 180gr | Swift Scirocco. Norma MRP delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,791 fps to 3,031 fps. ADI AR 2217 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 52–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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, Vihtavuori N560 rank at the top here: for .300 Blaser Mag. with the .308 | 180gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Norma 217 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.