Load Specifications
Load data in caliber .375 Blaser Mag. with .375 | 250gr | Barnes X S bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 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 2015 | <<locked>> | 82% | 52,315 psi | 86% | 2657 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,998 psi | 90% | 2736 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,940 psi | 89% | 2776 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,650 psi | 88% | 2710 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 54,578 psi | 90% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,881 psi | 87% | 2841 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 86% | 54,041 psi | 89% | 2792 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 54,694 psi | 90% | 2789 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,011 psi | 87% | 2746 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,679 psi | 88% | 2726 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 52,837 psi | 87% | 2897 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 54,679 psi | 90% | 2805 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,766 psi | 90% | 2815 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 52,199 psi | 86% | 2785 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,708 psi | 88% | 2887 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,868 psi | 90% | 2930 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,291 psi | 65% | 2644 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,453 psi | 71% | 2792 fps | 97.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,243 psi | 87% | 2802 fps | 99.4% |
| Bofors RP3 | <<locked>> | 90% | 52,330 psi | 86% | 2785 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 52,431 psi | 86% | 2743 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,708 psi | 90% | 2726 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,243 psi | 86% | 2776 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,650 psi | 88% | 2864 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 52,939 psi | 87% | 2733 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,040 psi | 87% | 2792 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 94% | 53,301 psi | 88% | 2854 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 98% | 54,056 psi | 89% | 2812 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 86% | 54,520 psi | 90% | 2805 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,241 psi | 82% | 2772 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,345 psi | 88% | 2835 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 52,388 psi | 86% | 2858 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,766 psi | 59% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,346 psi | 89% | 2789 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 52,808 psi | 87% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 53,476 psi | 88% | 2762 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,258 psi | 87% | 2730 fps | 97% |
| IMR 4350 | <<locked>> | 98% | 52,025 psi | 85% | 2766 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 53,853 psi | 88% | 2772 fps | 97.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,630 psi | 78% | 2743 fps | 98.7% |
| IMR 4895 | <<locked>> | 88% | 53,505 psi | 88% | 2818 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 53,011 psi | 87% | 2746 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,940 psi | 89% | 2776 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,563 psi | 88% | 2720 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 54,505 psi | 89% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,621 psi | 88% | 2772 fps | 98.3% |
| Lovex S070 | <<locked>> | 98% | 54,259 psi | 89% | 2802 fps | 97.5% |
| Norma 201 | <<locked>> | 86% | 53,374 psi | 88% | 2746 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,359 psi | 88% | 2746 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,708 psi | 90% | 2825 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 55,042 psi | 90% | 2877 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 90% | 54,650 psi | 90% | 2844 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,853 psi | 88% | 2871 fps | 98.1% |
| Ramshot TAC | <<locked>> | 84% | 53,214 psi | 87% | 2759 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 52,678 psi | 86% | 2779 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,853 psi | 88% | 2746 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,419 psi | 60% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,127 psi | 87% | 2766 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,098 psi | 86% | 2848 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,636 psi | 90% | 2930 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 51,996 psi | 85% | 2858 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 52,040 psi | 85% | 2881 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 84% | 54,839 psi | 90% | 2733 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,867 psi | 88% | 2743 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 52,185 psi | 86% | 2776 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 94% | 52,431 psi | 86% | 2743 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,621 psi | 88% | 2772 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,940 psi | 89% | 2776 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,505 psi | 89% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,259 psi | 89% | 2802 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,040 psi | 87% | 2828 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 51,880 psi | 85% | 2740 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 52,388 psi | 86% | 2766 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,433 psi | 89% | 2684 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,186 psi | 89% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,650 psi | 88% | 2723 fps | 97.1% |
| Somchem S321 | <<locked>> | 82% | 54,172 psi | 89% | 2779 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,998 psi | 89% | 2684 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,404 psi | 89% | 2782 fps | 99.8% |
| Somchem S355 | <<locked>> | 92% | 52,562 psi | 86% | 2772 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,705 psi | 82% | 2835 fps | 100% |
| Unknown powder | <<locked>> | 96% | 52,634 psi | 86% | 2831 fps | 98.8% |
| Vihtavuori N130 | <<locked>> | 82% | 54,201 psi | 89% | 2644 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,418 psi | 89% | 2667 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,084 psi | 87% | 2710 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,766 psi | 88% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,563 psi | 88% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,070 psi | 89% | 2822 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 84% | 53,490 psi | 88% | 2746 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 52,040 psi | 85% | 2723 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,345 psi | 88% | 2828 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,641 psi | 70% | 2720 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,549 psi | 90% | 2802 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,548 psi | 88% | 2799 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,301 psi | 88% | 2854 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,491 psi | 58% | 2644 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 2015 | <<locked>> | 80% | 49,356 psi | 81% | 2615 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,163 psi | 71% | 2559 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,398 psi | 78% | 2677 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 50,589 psi | 83% | 2664 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 40,727 psi | 67% | 2552 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,895 psi | 56% | 2480 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 45,223 psi | 74% | 2644 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 38,551 psi | 63% | 2497 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,036 psi | 77% | 2648 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 47,326 psi | 78% | 2638 fps | 100% |
| Alliant Power Pro 2000-MR | 72.1 gr | 80% | 40,915 psi | 67% | 2671 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,759 psi | 75% | 2657 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,450 psi | 63% | 2526 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,089 psi | 67% | 2585 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,926 psi | 59% | 2533 fps | 95.7% |
| Alliant Reloder-17 | 71 gr | 80% | 33,301 psi | 55% | 2493 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,473 psi | 52% | 2444 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,130 psi | 63% | 2671 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,164 psi | 73% | 2644 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 38,392 psi | 63% | 2536 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 46,717 psi | 77% | 2648 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,805 psi | 80% | 2635 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,977 psi | 75% | 2674 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,024 psi | 82% | 2808 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 49,719 psi | 82% | 2684 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,044 psi | 64% | 2533 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 88% | 44,092 psi | 72% | 2690 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 96% | 51,082 psi | 84% | 2762 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 45,614 psi | 75% | 2657 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,646 psi | 49% | 2336 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,189 psi | 64% | 2582 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 94% | 48,950 psi | 80% | 2799 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 44% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,553 psi | 67% | 2546 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 41,669 psi | 68% | 2592 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,072 psi | 63% | 2480 fps | 97.2% |
| IMR 4166 Enduron | <<locked>> | 86% | 44,889 psi | 74% | 2585 fps | 95.1% |
| IMR 4350 | <<locked>> | 96% | 49,037 psi | 81% | 2713 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,310 psi | 74% | 2625 fps | 95.2% |
| IMR 4831 | <<locked>> | 90% | 35,505 psi | 58% | 2500 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,047 psi | 69% | 2615 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 47,036 psi | 77% | 2648 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 44,730 psi | 73% | 2631 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,150 psi | 74% | 2579 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 40,843 psi | 67% | 2543 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 40,248 psi | 66% | 2533 fps | 95.4% |
| Lovex S070 | <<locked>> | 92% | 45,600 psi | 75% | 2657 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,759 psi | 73% | 2602 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 44,657 psi | 73% | 2608 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,495 psi | 66% | 2575 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 36,071 psi | 59% | 2523 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,682 psi | 65% | 2582 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 42,206 psi | 69% | 2661 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 46,949 psi | 77% | 2654 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,296 psi | 76% | 2674 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,647 psi | 83% | 2697 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,311 psi | 45% | 1558 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,727 psi | 69% | 2562 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,699 psi | 70% | 2684 fps | 98.3% |
| ReloadSwiss RS 60 | 71 gr | 80% | 35,244 psi | 58% | 2559 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 35,578 psi | 58% | 2539 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,234 psi | 66% | 2648 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 49,110 psi | 81% | 2644 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,844 psi | 70% | 2559 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 36,376 psi | 60% | 2484 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 46,717 psi | 77% | 2648 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,248 psi | 66% | 2533 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,730 psi | 73% | 2631 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,843 psi | 67% | 2543 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 92% | 45,600 psi | 75% | 2657 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,622 psi | 60% | 2520 fps | 97.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,484 psi | 75% | 2631 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,569 psi | 72% | 2615 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,672 psi | 75% | 2549 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,203 psi | 63% | 2425 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,570 psi | 73% | 2572 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 50,894 psi | 84% | 2730 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,469 psi | 75% | 2556 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,976 psi | 74% | 2628 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 36,941 psi | 61% | 2487 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 27,383 psi | 45% | 2329 fps | 95.6% |
| Unknown powder | <<locked>> | 84% | 36,724 psi | 60% | 2523 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 51,242 psi | 84% | 2605 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,745 psi | 75% | 2543 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,930 psi | 69% | 2539 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,322 psi | 69% | 2546 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,143 psi | 58% | 2425 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 35,360 psi | 58% | 2474 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 47,137 psi | 77% | 2644 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 40,915 psi | 67% | 2539 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 37,057 psi | 61% | 2530 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 33,620 psi | 55% | 2520 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,270 psi | 51% | 2349 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 50,169 psi | 82% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,092 psi | 72% | 2690 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,618 psi | 52% | 2523 fps | 96.1% |
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 96 powders for .375 Blaser Mag. loaded with the .375 | 250gr | Barnes X S. Alliant Reloder-17 delivers the highest muzzle velocity at 2,930 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,930 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .375 Blaser Mag. with the .375 | 250gr | Barnes X S 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.