Load Specifications
Load data in caliber .375 Blaser Mag. with .374 | 250gr | Rhino Penetrator bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Power Pro 2000-MR.
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 2015 | <<locked>> | 84% | 52,518 psi | 86% | 2687 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,085 psi | 89% | 2756 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,998 psi | 89% | 2753 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,186 psi | 89% | 2805 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 54,636 psi | 90% | 2753 fps | 96.6% |
| Accurate 4064 | <<locked>> | 92% | 53,925 psi | 89% | 2799 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,316 psi | 88% | 2874 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 88% | 54,665 psi | 90% | 2828 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 52,489 psi | 86% | 2779 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,824 psi | 88% | 2782 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,346 psi | 89% | 2759 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,201 psi | 89% | 2946 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 52,112 psi | 86% | 2802 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,823 psi | 87% | 2822 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,474 psi | 85% | 2874 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 96% | 52,562 psi | 86% | 2917 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,666 psi | 60% | 2612 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,625 psi | 67% | 2756 fps | 96.8% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,491 psi | 89% | 2844 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 52,431 psi | 86% | 2815 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 52,953 psi | 87% | 2779 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 52,489 psi | 86% | 2720 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,055 psi | 87% | 2815 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,795 psi | 90% | 2907 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 53,853 psi | 88% | 2766 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,635 psi | 88% | 2825 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 96% | 54,549 psi | 90% | 2894 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 86% | 51,909 psi | 85% | 2789 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,732 psi | 78% | 2756 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,404 psi | 89% | 2871 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,693 psi | 88% | 2900 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 58% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 51,982 psi | 85% | 2776 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 53,403 psi | 88% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,288 psi | 89% | 2799 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 94% | 54,099 psi | 89% | 2769 fps | 97.4% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,982 psi | 87% | 2802 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,824 psi | 90% | 2812 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,788 psi | 74% | 2717 fps | 98.3% |
| IMR 4895 | <<locked>> | 90% | 54,157 psi | 89% | 2851 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 53,824 psi | 88% | 2782 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,940 psi | 89% | 2769 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,389 psi | 89% | 2808 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,592 psi | 90% | 2759 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 54,853 psi | 90% | 2808 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,998 psi | 89% | 2805 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,723 psi | 90% | 2835 fps | 97.8% |
| Norma 201 | <<locked>> | 88% | 53,563 psi | 88% | 2779 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,969 psi | 89% | 2779 fps | 100% |
| Norma 203B | <<locked>> | 90% | 52,040 psi | 85% | 2808 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 52,373 psi | 86% | 2861 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 90% | 52,214 psi | 86% | 2831 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,445 psi | 84% | 2854 fps | 97.9% |
| Ramshot TAC | <<locked>> | 86% | 54,186 psi | 89% | 2799 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,679 psi | 88% | 2818 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,926 psi | 90% | 2785 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,621 psi | 58% | 1745 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,461 psi | 88% | 2766 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,172 psi | 89% | 2808 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,823 psi | 87% | 2884 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,388 psi | 86% | 2920 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,866 psi | 87% | 2894 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,084 psi | 87% | 2920 fps | 99% |
| Rottweil R 901 | <<locked>> | 86% | 54,549 psi | 90% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,027 psi | 89% | 2776 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 52,243 psi | 86% | 2802 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 52,953 psi | 87% | 2779 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,998 psi | 89% | 2805 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,389 psi | 89% | 2808 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,853 psi | 90% | 2808 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,723 psi | 90% | 2835 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,998 psi | 89% | 2864 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,460 psi | 86% | 2776 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,142 psi | 87% | 2802 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 52,025 psi | 85% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 51,967 psi | 85% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,476 psi | 89% | 2756 fps | 97.4% |
| Somchem S321 | <<locked>> | 84% | 55,100 psi | 90% | 2818 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,534 psi | 90% | 2717 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,083 psi | 86% | 2769 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 52,736 psi | 87% | 2802 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,876 psi | 77% | 2812 fps | 100% |
| Unknown powder | <<locked>> | 98% | 53,606 psi | 88% | 2867 fps | 99% |
| Vihtavuori N130 | <<locked>> | 84% | 55,100 psi | 90% | 2684 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 52,214 psi | 86% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,592 psi | 88% | 2743 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,447 psi | 89% | 2756 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,201 psi | 89% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 51,547 psi | 85% | 2805 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 54,302 psi | 89% | 2782 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 52,576 psi | 86% | 2753 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,027 psi | 89% | 2864 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,552 psi | 65% | 2687 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,301 psi | 86% | 2792 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,650 psi | 90% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,549 psi | 90% | 2894 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,764 psi | 54% | 2592 fps | 97.1% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,331 psi | 89% | 2831 fps | 100% |
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 2015 | <<locked>> | 80% | 46,369 psi | 76% | 2598 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,618 psi | 83% | 2707 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,001 psi | 64% | 2523 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,193 psi | 73% | 2654 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 47,979 psi | 79% | 2644 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 36,869 psi | 61% | 2513 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 35,056 psi | 58% | 2539 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 42,685 psi | 70% | 2625 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,347 psi | 60% | 2477 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,701 psi | 73% | 2635 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 44,556 psi | 73% | 2621 fps | 100% |
| Alliant Power Pro 2000-MR | 73.3 gr | 80% | 38,624 psi | 63% | 2644 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,636 psi | 59% | 2497 fps | 98% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,421 psi | 63% | 2559 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,694 psi | 59% | 2556 fps | 95.8% |
| Alliant Reloder-17 | 72.1 gr | 80% | 30,763 psi | 51% | 2454 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,501 psi | 50% | 2448 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,913 psi | 62% | 2694 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,655 psi | 68% | 2625 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 35,215 psi | 58% | 2500 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 46,760 psi | 77% | 2674 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,456 psi | 76% | 2621 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,323 psi | 71% | 2654 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,659 psi | 78% | 2792 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 47,471 psi | 78% | 2674 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,201 psi | 59% | 2500 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 90% | 44,367 psi | 73% | 2720 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,018 psi | 71% | 2638 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,632 psi | 50% | 2398 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,666 psi | 60% | 2556 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 94% | 46,601 psi | 77% | 2779 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,266 psi | 43% | 1526 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,232 psi | 63% | 2526 fps | 98.2% |
| IMR 3031 | <<locked>> | 80% | 38,899 psi | 64% | 2569 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,607 psi | 58% | 2454 fps | 96.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 45,194 psi | 74% | 2618 fps | 95.4% |
| IMR 4350 | <<locked>> | 96% | 46,775 psi | 77% | 2700 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,701 psi | 75% | 2657 fps | 95.4% |
| IMR 4831 | <<locked>> | 92% | 34,780 psi | 57% | 2513 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 39,349 psi | 65% | 2589 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 44,701 psi | 73% | 2635 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 50,459 psi | 83% | 2717 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,568 psi | 68% | 2605 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,888 psi | 70% | 2562 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 37,942 psi | 62% | 2516 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 39,842 psi | 65% | 2552 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 42,670 psi | 70% | 2631 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 41,843 psi | 69% | 2579 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 41,916 psi | 69% | 2589 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,840 psi | 62% | 2549 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 35,578 psi | 58% | 2543 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 37,289 psi | 61% | 2559 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 42,279 psi | 69% | 2687 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 44,628 psi | 73% | 2638 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,961 psi | 72% | 2657 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,211 psi | 79% | 2680 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,498 psi | 44% | 1558 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,009 psi | 82% | 2713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,742 psi | 69% | 2592 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,016 psi | 66% | 2654 fps | 97.8% |
| ReloadSwiss RS 60 | 72.1 gr | 80% | 32,764 psi | 54% | 2523 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,012 psi | 57% | 2556 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,869 psi | 62% | 2618 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 45,658 psi | 75% | 2621 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,769 psi | 65% | 2533 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 33,083 psi | 54% | 2444 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 46,760 psi | 77% | 2674 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,842 psi | 65% | 2552 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,568 psi | 68% | 2605 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,942 psi | 62% | 2516 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 92% | 42,670 psi | 70% | 2631 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,084 psi | 56% | 2490 fps | 96.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,772 psi | 70% | 2608 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,104 psi | 67% | 2592 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,192 psi | 71% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,795 psi | 59% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,846 psi | 74% | 2602 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 48,167 psi | 79% | 2710 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,830 psi | 70% | 2539 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,453 psi | 70% | 2608 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 34,113 psi | 56% | 2451 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 26,281 psi | 43% | 2329 fps | 95.1% |
| Unknown powder | <<locked>> | 86% | 36,361 psi | 60% | 2546 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 48,805 psi | 80% | 2595 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,453 psi | 71% | 2530 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,986 psi | 64% | 2516 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,697 psi | 65% | 2523 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,343 psi | 53% | 2388 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 34,882 psi | 57% | 2490 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 44,672 psi | 73% | 2628 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 38,276 psi | 63% | 2516 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 36,608 psi | 60% | 2546 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 94% | 32,561 psi | 53% | 2523 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,821 psi | 51% | 2365 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 47,630 psi | 78% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 44,367 psi | 73% | 2720 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,748 psi | 50% | 2526 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,517 psi | 83% | 2772 fps | 99.9% |
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 98 powders for .375 Blaser Mag. loaded with the .374 | 250gr | Rhino Penetrator. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,946 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,946 fps. Accurate 4350 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.374" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, 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. ReloadSwiss RS 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .375 Blaser Mag. with the .374 | 250gr | Rhino Penetrator 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.