Load Specifications
Load data in caliber .300 Blaser Mag. with .308 | 170gr | Speer Hot-Cor bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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 2700 | <<locked>> | 82% | 54,679 psi | 90% | 2923 fps | 99% |
| Accurate 3100 | <<locked>> | 98% | 53,316 psi | 88% | 2976 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 54,360 psi | 89% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 51,532 psi | 85% | 2966 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 54,462 psi | 89% | 3123 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 84% | 54,070 psi | 89% | 2940 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 52,663 psi | 86% | 3015 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 98% | 53,722 psi | 88% | 3064 fps | 97.3% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 52,837 psi | 87% | 3012 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,085 psi | 90% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 52,533 psi | 86% | 3028 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,563 psi | 88% | 3048 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 52,156 psi | 86% | 3002 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 52,910 psi | 87% | 3061 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,751 psi | 88% | 3045 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,673 psi | 77% | 2979 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,824 psi | 88% | 3133 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,895 psi | 85% | 3041 fps | 98.2% |
| Bofors RP3 | <<locked>> | 82% | 52,388 psi | 86% | 2927 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 52,910 psi | 87% | 3061 fps | 98.5% |
| Bofors RP7 | <<locked>> | 86% | 51,895 psi | 85% | 2913 fps | 98.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,238 psi | 76% | 2913 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 82% | 52,692 psi | 87% | 2946 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 53,592 psi | 88% | 3018 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 53,330 psi | 88% | 2976 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 96% | 53,824 psi | 88% | 3005 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 52,910 psi | 87% | 2989 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 52,779 psi | 87% | 2949 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,556 psi | 75% | 3015 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 88% | 53,838 psi | 88% | 3054 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 60% | 1867 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 53,606 psi | 88% | 2923 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 52,910 psi | 87% | 2949 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 86% | 53,359 psi | 88% | 2940 fps | 99.2% |
| IMR 4831 | <<locked>> | 90% | 52,054 psi | 85% | 2959 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 52,214 psi | 86% | 2940 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,897 psi | 90% | 3097 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 53,795 psi | 88% | 2913 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 53,606 psi | 88% | 2940 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 54,911 psi | 90% | 2982 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,413 psi | 78% | 2877 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 54,520 psi | 90% | 2972 fps | 100% |
| Norma 204 | <<locked>> | 90% | 53,519 psi | 88% | 3002 fps | 98.2% |
| Norma MRP | <<locked>> | 96% | 52,547 psi | 86% | 3087 fps | 99.4% |
| Norma URP | <<locked>> | 90% | 53,838 psi | 88% | 3005 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 51,648 psi | 85% | 3051 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 90% | 52,678 psi | 86% | 3005 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,806 psi | 82% | 2986 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 61% | 1916 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 52,547 psi | 86% | 2927 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 52,895 psi | 87% | 3035 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 51,401 psi | 84% | 2989 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,447 psi | 88% | 3074 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,701 psi | 75% | 3012 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 84% | 52,707 psi | 87% | 2927 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,172 psi | 89% | 2982 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 96% | 54,926 psi | 90% | 3048 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 86% | 51,895 psi | 85% | 2913 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 53,606 psi | 88% | 2940 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 53,795 psi | 88% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,911 psi | 90% | 2982 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 53,954 psi | 89% | 2986 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 53,432 psi | 88% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 53,214 psi | 87% | 2890 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,462 psi | 89% | 3041 fps | 98.6% |
| Somchem S355 | <<locked>> | 84% | 52,489 psi | 86% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 52,315 psi | 86% | 2917 fps | 96.3% |
| Somchem S365 | <<locked>> | 92% | 53,476 psi | 88% | 3009 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 52,054 psi | 85% | 2963 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 86% | 53,693 psi | 88% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 52,344 psi | 86% | 2946 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,868 psi | 90% | 2992 fps | 99% |
| Vihtavuori N540 | <<locked>> | 82% | 54,592 psi | 90% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,998 psi | 90% | 3005 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 52,779 psi | 87% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 52,794 psi | 87% | 3074 fps | 96.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,457 psi | 80% | 2979 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 51,851 psi | 85% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 53,809 psi | 88% | 3022 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,414 psi | 81% | 3120 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 51,924 psi | 85% | 2953 fps | 98.1% |
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% | 51,285 psi | 84% | 2867 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 33,156 psi | 54% | 2572 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 51,111 psi | 84% | 2861 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,175 psi | 64% | 2733 fps | 98.9% |
| Accurate High Country | <<locked>> | 90% | 44,208 psi | 73% | 2930 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 47,892 psi | 79% | 2835 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,451 psi | 66% | 2772 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 94% | 47,108 psi | 77% | 2940 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,712 psi | 67% | 2776 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,544 psi | 80% | 2861 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,000 psi | 62% | 2743 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,236 psi | 71% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,277 psi | 66% | 2766 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,582 psi | 67% | 2818 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,007 psi | 46% | 2490 fps | 97.2% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,778 psi | 52% | 2615 fps | 95.5% |
| Alliant Reloder-26 | 67.8 gr | 80% | 29,979 psi | 49% | 2605 fps | 95.6% |
| Bofors RP15 | <<locked>> | 92% | 40,030 psi | 66% | 2805 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 49,008 psi | 80% | 2874 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 40,582 psi | 67% | 2818 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 43,047 psi | 71% | 2746 fps | 97.1% |
| Hodgdon H1000 | <<locked>> | 98% | 43,207 psi | 71% | 2848 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 49,327 psi | 81% | 2887 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 41,133 psi | 68% | 2782 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 43,918 psi | 72% | 2799 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 92% | 47,021 psi | 77% | 2884 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,458 psi | 81% | 2927 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,607 psi | 58% | 2631 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,943 psi | 66% | 2881 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 40,118 psi | 66% | 2792 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 45% | 1670 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,386 psi | 83% | 2871 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 38,624 psi | 63% | 2671 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,396 psi | 73% | 2776 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 37,594 psi | 62% | 2680 fps | 98.7% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,965 psi | 80% | 2881 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 44,962 psi | 74% | 2910 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 50,633 psi | 83% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,989 psi | 69% | 2726 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 40,074 psi | 66% | 2703 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 32,314 psi | 53% | 2552 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 51,126 psi | 84% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,785 psi | 67% | 2756 fps | 95.1% |
| Norma MRP | 70.7 gr | 86% | 37,101 psi | 61% | 2766 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 38,783 psi | 64% | 2723 fps | 98.8% |
| Ramshot Grand | <<locked>> | 94% | 44,715 psi | 73% | 2917 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 37,739 psi | 62% | 2713 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 92% | 37,130 psi | 61% | 2723 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 46% | 1709 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,298 psi | 81% | 2871 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,890 psi | 75% | 2923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,928 psi | 64% | 2749 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,637 psi | 62% | 2756 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,970 psi | 61% | 2795 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 46,122 psi | 76% | 2818 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,657 psi | 73% | 2805 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 39,218 psi | 64% | 2743 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 43,047 psi | 71% | 2746 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,989 psi | 69% | 2726 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 50,633 psi | 83% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,074 psi | 66% | 2703 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,384 psi | 78% | 2877 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,166 psi | 77% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,089 psi | 67% | 2667 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,655 psi | 68% | 2802 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 46,470 psi | 76% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,907 psi | 80% | 2854 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 35,404 psi | 58% | 2684 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 37,434 psi | 61% | 2674 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 44,222 psi | 73% | 2743 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,219 psi | 66% | 2723 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 39,334 psi | 65% | 2707 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 51,227 psi | 84% | 2844 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,740 psi | 65% | 2726 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 30,995 psi | 51% | 2569 fps | 97.2% |
| Vihtavuori N560 | 75.6 gr | 92% | 45,992 psi | 76% | 2946 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 98% | 45,252 psi | 74% | 2917 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,291 psi | 65% | 2687 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,133 psi | 68% | 2782 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,758 psi | 41% | 2461 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 90% | 42,003 psi | 69% | 2769 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 81 powders for .300 Blaser Mag. loaded with the .308 | 170gr | Speer Hot-Cor. Alliant Reloder-26 delivers the highest muzzle velocity at 3,133 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,133 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 81 of the 81 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 170.0 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for .300 Blaser Mag. with the .308 | 170gr | Speer Hot-Cor 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.