Load Specifications
Load data in caliber .375 R Verney-Carron with .376 | 250gr | Peregrine Glider GRM bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and ReloadSwiss RS 60.
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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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 51,517 psi | 87% | 2710 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 52,982 psi | 89% | 2776 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,534 psi | 90% | 2831 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,534 psi | 90% | 2831 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 50,372 psi | 85% | 2733 fps | 96.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,393 psi | 68% | 2671 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 53,171 psi | 89% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,200 psi | 89% | 2910 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 50,734 psi | 85% | 2808 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 51,909 psi | 87% | 2812 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,113 psi | 89% | 2812 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 50,415 psi | 85% | 2736 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,650 psi | 90% | 2979 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 51,387 psi | 86% | 2822 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 51,764 psi | 87% | 2835 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 52,243 psi | 88% | 2854 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 98% | 51,329 psi | 86% | 2917 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 52,272 psi | 88% | 2953 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,812 psi | 65% | 2703 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,453 psi | 73% | 2867 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 50,401 psi | 85% | 2822 fps | 99.5% |
| Bofors RP3 | <<locked>> | 90% | 51,953 psi | 87% | 2844 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 52,373 psi | 88% | 2818 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 51,547 psi | 87% | 2746 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 52,243 psi | 88% | 2838 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 52,982 psi | 89% | 2792 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,026 psi | 89% | 2858 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 92% | 50,633 psi | 85% | 2877 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 96% | 51,634 psi | 87% | 2844 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 84% | 51,227 psi | 86% | 2818 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,879 psi | 86% | 2844 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 50,589 psi | 85% | 2854 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 53,272 psi | 90% | 2946 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,360 psi | 59% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 51,445 psi | 87% | 2808 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 53,084 psi | 89% | 2831 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 50,589 psi | 85% | 2782 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,403 psi | 90% | 2808 fps | 97.9% |
| IMR 4350 | <<locked>> | 98% | 52,736 psi | 89% | 2844 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 51,053 psi | 86% | 2799 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,776 psi | 80% | 2808 fps | 99.2% |
| IMR 4895 | <<locked>> | 88% | 53,592 psi | 90% | 2884 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,113 psi | 89% | 2812 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,534 psi | 90% | 2831 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,737 psi | 90% | 2789 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 51,053 psi | 86% | 2792 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,505 psi | 90% | 2841 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 51,126 psi | 86% | 2825 fps | 97.8% |
| Norma 201 | <<locked>> | 86% | 52,634 psi | 89% | 2805 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,200 psi | 89% | 2805 fps | 100% |
| Norma 203B | <<locked>> | 88% | 51,503 psi | 87% | 2841 fps | 99.9% |
| Norma 204 | <<locked>> | 98% | 53,185 psi | 89% | 2890 fps | 96.2% |
| Norma URP | <<locked>> | 98% | 52,475 psi | 88% | 2904 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 51,793 psi | 87% | 2864 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 98% | 51,314 psi | 86% | 2897 fps | 98.5% |
| Ramshot TAC | <<locked>> | 84% | 53,243 psi | 90% | 2831 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 52,968 psi | 89% | 2848 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,795 psi | 90% | 2812 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,795 psi | 60% | 1785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,359 psi | 90% | 2841 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,518 psi | 88% | 2917 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 52,098 psi | 88% | 2953 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 53,011 psi | 89% | 2936 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 52,866 psi | 89% | 2966 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 53,447 psi | 90% | 2782 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,243 psi | 90% | 2805 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 51,822 psi | 87% | 2835 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 52,373 psi | 88% | 2818 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,505 psi | 90% | 2841 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,534 psi | 90% | 2831 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 51,053 psi | 86% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 51,126 psi | 86% | 2825 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,795 psi | 90% | 2900 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 51,532 psi | 87% | 2805 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 52,475 psi | 88% | 2831 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 51,053 psi | 86% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 51,271 psi | 86% | 2700 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,809 psi | 90% | 2795 fps | 98% |
| Somchem S335 | <<locked>> | 86% | 53,592 psi | 90% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 51,372 psi | 86% | 2799 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 52,315 psi | 88% | 2835 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,299 psi | 85% | 2900 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,717 psi | 79% | 2779 fps | 96.1% |
| Unknown powder | <<locked>> | 96% | 53,519 psi | 90% | 2910 fps | 99.4% |
| Vihtavuori N133 | <<locked>> | 84% | 51,416 psi | 86% | 2687 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,026 psi | 89% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 50,604 psi | 85% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,708 psi | 90% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 51,488 psi | 87% | 2844 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 53,432 psi | 90% | 2808 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 51,938 psi | 87% | 2782 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 50,444 psi | 85% | 2848 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,540 psi | 72% | 2779 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 51,880 psi | 87% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 50,633 psi | 85% | 2877 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,606 psi | 58% | 2703 fps | 99% |
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% | 48,312 psi | 81% | 2664 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,553 psi | 68% | 2585 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,499 psi | 78% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,499 psi | 78% | 2726 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 44,193 psi | 74% | 2625 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 37,652 psi | 63% | 2615 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 38,363 psi | 65% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,343 psi | 54% | 2510 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 44,570 psi | 75% | 2700 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 37,826 psi | 64% | 2549 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,731 psi | 79% | 2710 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,065 psi | 79% | 2690 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,582 psi | 68% | 2736 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,136 psi | 76% | 2713 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,405 psi | 63% | 2572 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,248 psi | 68% | 2638 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,011 psi | 56% | 2530 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,256 psi | 54% | 2539 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,297 psi | 48% | 2428 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,041 psi | 59% | 2671 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,874 psi | 74% | 2707 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 36,927 psi | 62% | 2575 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 43,308 psi | 73% | 2654 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,457 psi | 81% | 2697 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,527 psi | 77% | 2730 fps | 100% |
| Hodgdon H322 | <<locked>> | 80% | 49,617 psi | 83% | 2743 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,869 psi | 64% | 2579 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 86% | 41,089 psi | 69% | 2700 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 92% | 45,571 psi | 77% | 2736 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 44,991 psi | 76% | 2713 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,239 psi | 47% | 2372 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,595 psi | 65% | 2635 fps | 99.2% |
| Hodgdon Superformance | 91.8 gr | 90% | 42,844 psi | 72% | 2756 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,266 psi | 44% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,030 psi | 67% | 2602 fps | 99.1% |
| IMR 3031 | <<locked>> | 80% | 40,944 psi | 69% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,057 psi | 62% | 2526 fps | 97.7% |
| IMR 4166 Enduron | <<locked>> | 84% | 41,843 psi | 70% | 2598 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 43,540 psi | 73% | 2684 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,424 psi | 71% | 2638 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 32,358 psi | 54% | 2493 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 41,234 psi | 69% | 2667 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 46,731 psi | 79% | 2710 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,555 psi | 73% | 2677 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,643 psi | 75% | 2638 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 39,552 psi | 67% | 2585 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 36,767 psi | 62% | 2530 fps | 95.3% |
| Lovex S070 | <<locked>> | 88% | 39,595 psi | 67% | 2608 fps | 95% |
| Norma 201 | <<locked>> | 80% | 43,482 psi | 73% | 2651 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 43,947 psi | 74% | 2661 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,595 psi | 67% | 2625 fps | 98.7% |
| Norma 204 | <<locked>> | 96% | 49,676 psi | 84% | 2835 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 32,851 psi | 55% | 2513 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 39,247 psi | 66% | 2638 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 39,291 psi | 66% | 2667 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 46,702 psi | 79% | 2720 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,122 psi | 78% | 2736 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,502 psi | 85% | 2759 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,600 psi | 45% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,421 psi | 65% | 2566 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,511 psi | 71% | 2743 fps | 98.8% |
| ReloadSwiss RS 60 | 77.2 gr | 80% | 34,389 psi | 58% | 2608 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,621 psi | 58% | 2585 fps | 95.9% |
| ReloadSwiss RS 70 | 86.2 gr | 88% | 37,246 psi | 63% | 2654 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 47,297 psi | 80% | 2690 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,408 psi | 70% | 2605 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 34,693 psi | 58% | 2516 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 43,308 psi | 73% | 2654 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,767 psi | 62% | 2530 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,555 psi | 73% | 2677 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,552 psi | 67% | 2585 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 39,595 psi | 67% | 2608 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,853 psi | 60% | 2569 fps | 97.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,904 psi | 76% | 2690 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,105 psi | 72% | 2671 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,976 psi | 76% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,391 psi | 63% | 2470 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,205 psi | 69% | 2579 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 44,527 psi | 75% | 2605 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,672 psi | 75% | 2687 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 35,607 psi | 60% | 2526 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 25,657 psi | 43% | 2349 fps | 95.7% |
| Somchem S385 | <<locked>> | 98% | 43,598 psi | 73% | 2723 fps | 95.3% |
| Unknown powder | <<locked>> | 84% | 35,940 psi | 60% | 2579 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 45,397 psi | 76% | 2595 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,944 psi | 69% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,611 psi | 70% | 2595 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,881 psi | 57% | 2464 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 32,155 psi | 54% | 2464 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 46,818 psi | 79% | 2707 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,045 psi | 67% | 2585 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,881 psi | 57% | 2520 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 90% | 30,356 psi | 51% | 2503 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,037 psi | 51% | 2385 fps | 96.4% |
| Winchester 760 | <<locked>> | 86% | 41,089 psi | 69% | 2700 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,369 psi | 48% | 2503 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 96 powders for .375 R Verney-Carron loaded with the .376 | 250gr | Peregrine Glider GRM. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,979 fps. Accurate 3100 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 (410 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.376" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, 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. ReloadSwiss RS 70, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .375 R Verney-Carron with the .376 | 250gr | Peregrine Glider GRM 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.