Load Specifications
Load data in caliber .375 R Verney-Carron with .375 | 300gr | Barnes TSX FB bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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 2495 | <<locked>> | 82% | 51,068 psi | 86% | 2500 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 53,113 psi | 89% | 2572 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,342 psi | 83% | 2605 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 51,532 psi | 87% | 2552 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 51,880 psi | 87% | 2654 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 50,502 psi | 85% | 2740 fps | 97.4% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 51,314 psi | 86% | 2736 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 86% | 52,504 psi | 88% | 2589 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,417 psi | 90% | 2700 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 50,952 psi | 86% | 2690 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 51,198 psi | 86% | 2700 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,388 psi | 90% | 2697 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,026 psi | 89% | 2608 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,214 psi | 89% | 2628 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 53,156 psi | 89% | 2710 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 50,546 psi | 85% | 2684 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 52,576 psi | 88% | 2687 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,385 psi | 83% | 2687 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,572 psi | 78% | 2625 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,625 psi | 68% | 2556 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,287 psi | 90% | 2808 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 45,266 psi | 76% | 2615 fps | 97.1% |
| Bofors RP3 | <<locked>> | 86% | 53,374 psi | 90% | 2621 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,385 psi | 83% | 2687 fps | 98.1% |
| Bofors RP7 | <<locked>> | 90% | 53,171 psi | 89% | 2612 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 50,575 psi | 85% | 2592 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 50,952 psi | 86% | 2654 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 51,285 psi | 86% | 2618 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 98% | 51,068 psi | 86% | 2638 fps | 96.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 53,519 psi | 90% | 2677 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,243 psi | 90% | 2635 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 51,692 psi | 87% | 2625 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 39,769 psi | 67% | 2575 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 90% | 50,705 psi | 85% | 2687 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 61% | 1604 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 52,924 psi | 89% | 2592 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 51,967 psi | 87% | 2572 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 51,314 psi | 86% | 2556 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 50,807 psi | 85% | 2595 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 51,692 psi | 87% | 2589 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 52,591 psi | 88% | 2648 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 51,271 psi | 86% | 2608 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,098 psi | 89% | 2635 fps | 96.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 48,414 psi | 81% | 2661 fps | 96.4% |
| Lovex S060 | <<locked>> | 82% | 53,780 psi | 90% | 2559 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 51,967 psi | 87% | 2566 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 51,561 psi | 87% | 2585 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 52,504 psi | 88% | 2625 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,901 psi | 69% | 2467 fps | 98.4% |
| Norma 201 | <<locked>> | 82% | 53,258 psi | 90% | 2572 fps | 100% |
| Norma 203B | <<locked>> | 84% | 52,460 psi | 88% | 2615 fps | 100% |
| Norma 204 | <<locked>> | 92% | 51,010 psi | 86% | 2641 fps | 98% |
| Norma MRPᴾ | <<locked>> | 100% | 52,301 psi | 88% | 2762 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 51,126 psi | 86% | 2644 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 53,142 psi | 89% | 2644 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 48,356 psi | 81% | 2671 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 94% | 53,287 psi | 90% | 2697 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 42,801 psi | 72% | 2552 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,753 psi | 62% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 50,676 psi | 85% | 2579 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 50,270 psi | 85% | 2674 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 51,779 psi | 87% | 2680 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 50,662 psi | 85% | 2707 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 39,436 psi | 66% | 2569 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 82% | 50,633 psi | 85% | 2530 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,417 psi | 90% | 2618 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 51,822 psi | 87% | 2621 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 98% | 51,605 psi | 87% | 2674 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 90% | 53,171 psi | 89% | 2612 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 51,561 psi | 87% | 2585 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 51,967 psi | 87% | 2566 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 52,504 psi | 88% | 2625 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 51,837 psi | 87% | 2631 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 53,040 psi | 89% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 51,808 psi | 87% | 2470 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 51,024 psi | 86% | 2539 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 51,169 psi | 86% | 2667 fps | 98.3% |
| Somchem S355 | <<locked>> | 88% | 53,563 psi | 90% | 2615 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 53,258 psi | 90% | 2615 fps | 96.6% |
| Somchem S365 | <<locked>> | 96% | 53,330 psi | 90% | 2690 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 52,243 psi | 88% | 2651 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 50,865 psi | 86% | 2490 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 51,242 psi | 86% | 2507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 51,517 psi | 87% | 2546 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 53,243 psi | 90% | 2638 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,037 psi | 81% | 2575 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 84% | 52,707 psi | 89% | 2552 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 52,330 psi | 88% | 2644 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,083 psi | 88% | 2697 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 52,895 psi | 89% | 2756 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 52,881 psi | 89% | 2612 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 51,126 psi | 86% | 2657 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,727 psi | 70% | 2677 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,142 psi | 89% | 2612 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,286 psi | 88% | 2644 fps | 98.3% |
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 2495 | <<locked>> | 80% | 47,848 psi | 80% | 2457 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,441 psi | 78% | 2467 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 30,400 psi | 51% | 2247 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 45,339 psi | 76% | 2464 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,098 psi | 57% | 2343 fps | 98.2% |
| Accurate High Country | <<locked>> | 94% | 43,772 psi | 74% | 2621 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 98% | 47,892 psi | 81% | 2680 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 43,540 psi | 73% | 2448 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 90% | 41,075 psi | 69% | 2484 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 44,628 psi | 75% | 2579 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,630 psi | 80% | 2644 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 38,464 psi | 65% | 2434 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,714 psi | 74% | 2467 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,804 psi | 79% | 2533 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,939 psi | 57% | 2359 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,116 psi | 64% | 2470 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 40,625 psi | 68% | 2480 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 37,811 psi | 64% | 2467 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 24,453 psi | 41% | 2129 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 92% | 31,560 psi | 53% | 2343 fps | 96.1% |
| Alliant Reloder-26 | 81.6 gr | 82% | 27,717 psi | 47% | 2280 fps | 95.1% |
| Bofors RP15 | <<locked>> | 96% | 39,711 psi | 67% | 2507 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 43,642 psi | 73% | 2477 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 37,811 psi | 64% | 2467 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 38,711 psi | 65% | 2362 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 44,237 psi | 74% | 2487 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 36,332 psi | 61% | 2388 fps | 96.2% |
| Hodgdon H4350 | <<locked>> | 80% | 39,523 psi | 66% | 2411 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 96% | 47,863 psi | 80% | 2585 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 46,847 psi | 79% | 2569 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,328 psi | 53% | 2257 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,356 psi | 81% | 2575 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 37,318 psi | 63% | 2520 fps | 95% |
| Hodgdon Superformance | 82.1 gr | 80% | 35,389 psi | 60% | 2395 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 45% | 1430 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,734 psi | 84% | 2546 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,788 psi | 77% | 2477 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,109 psi | 81% | 2507 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 36,970 psi | 62% | 2349 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,292 psi | 68% | 2392 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 32,996 psi | 55% | 2303 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 47,993 psi | 81% | 2556 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 46,804 psi | 79% | 2533 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 98% | 45,353 psi | 76% | 2605 fps | 95.6% |
| Lovex S060 | <<locked>> | 80% | 50,589 psi | 85% | 2513 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,847 psi | 77% | 2474 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,666 psi | 63% | 2346 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 35,824 psi | 60% | 2326 fps | 96.2% |
| Lovex S071 | <<locked>> | 92% | 31,444 psi | 53% | 2274 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 50,009 psi | 84% | 2526 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,137 psi | 78% | 2520 fps | 100% |
| Norma 204 | <<locked>> | 86% | 41,597 psi | 70% | 2477 fps | 95.8% |
| Norma MRP | <<locked>> | 88% | 34,606 psi | 58% | 2428 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 34,330 psi | 58% | 2343 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 80% | 46,209 psi | 78% | 2539 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 45,034 psi | 76% | 2612 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 33,257 psi | 56% | 2329 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 96% | 36,985 psi | 62% | 2438 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,325 psi | 46% | 1467 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,483 psi | 75% | 2477 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,611 psi | 68% | 2520 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,968 psi | 57% | 2362 fps | 97.9% |
| ReloadSwiss RS 70 | 78.8 gr | 80% | 33,301 psi | 56% | 2365 fps | 97.2% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 36,753 psi | 62% | 2507 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 47,703 psi | 80% | 2484 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,075 psi | 69% | 2428 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 45,498 psi | 77% | 2520 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 90% | 39,378 psi | 66% | 2461 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 38,711 psi | 65% | 2362 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,666 psi | 63% | 2346 fps | 97.8% |
| Shooters World Precision | <<locked>> | 80% | 45,847 psi | 77% | 2474 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 35,824 psi | 60% | 2326 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,308 psi | 71% | 2480 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,734 psi | 84% | 2556 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,047 psi | 72% | 2346 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,854 psi | 62% | 2293 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 39,001 psi | 66% | 2454 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 41,655 psi | 70% | 2428 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 46,659 psi | 78% | 2510 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 30,748 psi | 52% | 2300 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 34,998 psi | 59% | 2343 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 47,819 psi | 80% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,095 psi | 81% | 2464 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,726 psi | 67% | 2365 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 35,708 psi | 60% | 2343 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 92% | 36,825 psi | 62% | 2372 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 46,311 psi | 78% | 2461 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,114 psi | 59% | 2343 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 26,527 psi | 45% | 2195 fps | 96.1% |
| Vihtavuori N560 | <<locked>> | 96% | 46,224 psi | 78% | 2641 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,954 psi | 59% | 2316 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 36,463 psi | 61% | 2392 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 22,829 psi | 38% | 2146 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,588 psi | 83% | 2562 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 39,595 psi | 67% | 2431 fps | 95.3% |
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 95 powders for .375 R Verney-Carron loaded with the .375 | 300gr | Barnes TSX FB. Alliant Reloder-26 delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,604 fps to 2,808 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (410 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .375 R Verney-Carron with the .375 | 300gr | Barnes TSX FB 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.