Load Specifications
Load data in caliber .375 H&H Mag. with .375 | 270gr | Barnes Banded Solid RN LG bullet and 94 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 52 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 53,722 psi | 86% | 2497 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,564 psi | 89% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,346 psi | 87% | 2552 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,417 psi | 86% | 2572 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 53,940 psi | 86% | 2589 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,948 psi | 74% | 2546 fps | 97.7% |
| Accurate LT-30 | <<locked>> | 82% | 53,432 psi | 86% | 2444 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,824 psi | 86% | 2464 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,898 psi | 90% | 2621 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 96% | 53,490 psi | 86% | 2569 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 82% | 53,824 psi | 86% | 2552 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,288 psi | 89% | 2582 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 54,955 psi | 88% | 2559 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 53,287 psi | 85% | 2628 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,303 psi | 89% | 2723 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,014 psi | 90% | 2635 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 53,548 psi | 86% | 2497 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,345 psi | 86% | 2608 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,963 psi | 74% | 2552 fps | 97.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,895 psi | 85% | 2694 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,680 psi | 89% | 2484 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,680 psi | 89% | 2638 fps | 99.2% |
| Bofors RP3 | <<locked>> | 96% | 52,736 psi | 85% | 2602 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,186 psi | 87% | 2526 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 53,911 psi | 86% | 2608 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,666 psi | 89% | 2694 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 86% | 56,043 psi | 90% | 2582 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,519 psi | 86% | 2562 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,404 psi | 87% | 2612 fps | 98.5% |
| Hodgdon H4895 | <<locked>> | 92% | 56,362 psi | 90% | 2631 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,974 psi | 67% | 2444 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 54,998 psi | 88% | 2661 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,693 psi | 56% | 1539 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,404 psi | 87% | 2589 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 55,767 psi | 89% | 2618 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,376 psi | 90% | 2602 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,795 psi | 86% | 2536 fps | 96.3% |
| IMR 4198 | <<locked>> | 84% | 54,099 psi | 87% | 2464 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,941 psi | 90% | 2595 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,918 psi | 70% | 2493 fps | 97.3% |
| IMR 4895 | <<locked>> | 94% | 54,723 psi | 88% | 2638 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 55,288 psi | 89% | 2582 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,448 psi | 89% | 2572 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 54,911 psi | 88% | 2602 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,130 psi | 90% | 2556 fps | 99.7% |
| Lovex S062 | <<locked>> | 96% | 55,608 psi | 89% | 2598 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,329 psi | 82% | 2543 fps | 97.2% |
| Norma 201 | <<locked>> | 92% | 54,737 psi | 88% | 2572 fps | 100% |
| Norma 202 | <<locked>> | 92% | 54,926 psi | 88% | 2579 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,014 psi | 90% | 2644 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 45,992 psi | 74% | 2539 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 94% | 52,895 psi | 85% | 2621 fps | 99.4% |
| Ramshot TAC | <<locked>> | 90% | 55,680 psi | 89% | 2595 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,795 psi | 88% | 2615 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 86% | 53,200 psi | 85% | 2539 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,085 psi | 56% | 1575 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,984 psi | 88% | 2569 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,143 psi | 88% | 2595 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 53,301 psi | 85% | 2667 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 52,939 psi | 85% | 2700 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,629 psi | 73% | 2562 fps | 97.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,920 psi | 75% | 2579 fps | 96.7% |
| Rottweil R 901 | <<locked>> | 90% | 55,695 psi | 89% | 2559 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,882 psi | 88% | 2569 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,043 psi | 90% | 2638 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,329 psi | 82% | 2543 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,911 psi | 88% | 2602 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,608 psi | 89% | 2598 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,940 psi | 88% | 2539 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,056 psi | 87% | 2562 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,302 psi | 87% | 2648 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,418 psi | 87% | 2516 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,780 psi | 86% | 2572 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,331 psi | 87% | 2595 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 53,476 psi | 86% | 2480 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,362 psi | 90% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2497 fps | 95.8% |
| Somchem S321 | <<locked>> | 86% | 52,895 psi | 85% | 2569 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,883 psi | 90% | 2520 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 53,156 psi | 85% | 2566 fps | 99.4% |
| Somchem S355 | <<locked>> | 98% | 53,287 psi | 85% | 2592 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,973 psi | 66% | 2493 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 86% | 53,432 psi | 86% | 2451 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 53,417 psi | 86% | 2467 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 54,143 psi | 87% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,405 psi | 89% | 2556 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,853 psi | 88% | 2575 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,588 psi | 78% | 2543 fps | 97.9% |
| Vihtavuori N530 | <<locked>> | 90% | 55,898 psi | 90% | 2582 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 53,476 psi | 86% | 2556 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,355 psi | 76% | 2543 fps | 97.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,734 psi | 80% | 2533 fps | 99.5% |
| Winchester 748 | <<locked>> | 90% | 54,969 psi | 88% | 2625 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 53,780 psi | 86% | 2602 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 41,887 psi | 67% | 2326 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,411 psi | 73% | 2421 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,418 psi | 55% | 2251 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,683 psi | 65% | 2379 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 32,547 psi | 52% | 2234 fps | 99.1% |
| Accurate 4350 | <<locked>> | 94% | 37,202 psi | 60% | 2388 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 50,270 psi | 81% | 2402 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,633 psi | 81% | 2421 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,392 psi | 62% | 2333 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 34,969 psi | 56% | 2247 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 50,299 psi | 81% | 2507 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,393 psi | 65% | 2346 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 80% | 39,610 psi | 64% | 2352 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,746 psi | 75% | 2526 fps | 99.2% |
| Alliant Power Pro 2000-MR | 63 gr | 82% | 36,927 psi | 59% | 2392 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,792 psi | 51% | 2215 fps | 96% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,500 psi | 76% | 2418 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,316 psi | 55% | 2267 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 38,363 psi | 62% | 2402 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 33,446 psi | 54% | 2323 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,095 psi | 79% | 2398 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,217 psi | 60% | 2329 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 31,125 psi | 50% | 2215 fps | 95.9% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,612 psi | 68% | 2346 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,493 psi | 62% | 2362 fps | 98.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,337 psi | 68% | 2484 fps | 97.6% |
| Hodgdon H322 | <<locked>> | 80% | 46,166 psi | 74% | 2444 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,789 psi | 75% | 2467 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 39,189 psi | 63% | 2362 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 38,667 psi | 62% | 2346 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,822 psi | 53% | 2257 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,606 psi | 55% | 2310 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,889 psi | 42% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,362 psi | 60% | 2306 fps | 97.3% |
| IMR 3031 | <<locked>> | 80% | 37,710 psi | 60% | 2352 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,287 psi | 55% | 2228 fps | 95.2% |
| IMR 4166 Enduron | <<locked>> | 90% | 50,502 psi | 81% | 2487 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 48,095 psi | 77% | 2385 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 49,647 psi | 80% | 2503 fps | 95.3% |
| IMR 4831 | <<locked>> | 94% | 36,245 psi | 58% | 2349 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 35,099 psi | 56% | 2297 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 80% | 40,393 psi | 65% | 2346 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 45,136 psi | 72% | 2425 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 36,825 psi | 59% | 2320 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 39,262 psi | 63% | 2287 fps | 97.3% |
| Lovex S062 | <<locked>> | 80% | 34,098 psi | 55% | 2238 fps | 97.2% |
| Lovex S065 | <<locked>> | 94% | 42,873 psi | 69% | 2405 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 37,768 psi | 61% | 2297 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 37,768 psi | 61% | 2310 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 33,707 psi | 54% | 2260 fps | 95.6% |
| Norma URP | <<locked>> | 94% | 38,043 psi | 61% | 2392 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 33,185 psi | 53% | 2267 fps | 95% |
| Ramshot TAC | <<locked>> | 82% | 43,004 psi | 69% | 2395 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,378 psi | 63% | 2362 fps | 97.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,743 psi | 70% | 2392 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,976 psi | 42% | 1404 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,455 psi | 73% | 2431 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 45,469 psi | 73% | 2448 fps | 95.1% |
| ReloadSwiss RS 52 | 59.6 gr | 80% | 35,331 psi | 57% | 2352 fps | 95.5% |
| ReloadSwiss RS 60 | 60.6 gr | 80% | 29,414 psi | 47% | 2224 fps | 96.4% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 39,929 psi | 64% | 2457 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 43,772 psi | 70% | 2523 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 41,611 psi | 67% | 2346 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 35,969 psi | 58% | 2254 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 31,212 psi | 50% | 2208 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 42,873 psi | 69% | 2405 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,825 psi | 59% | 2320 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 34,098 psi | 55% | 2238 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,935 psi | 77% | 2441 fps | 99.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,691 psi | 81% | 2516 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 34,650 psi | 56% | 2303 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,138 psi | 77% | 2434 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 40,944 psi | 66% | 2365 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,941 psi | 59% | 2306 fps | 96.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,392 psi | 63% | 2267 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,343 psi | 52% | 2146 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 48,399 psi | 78% | 2451 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 43,265 psi | 69% | 2418 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 38,928 psi | 62% | 2274 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 37,884 psi | 61% | 2316 fps | 96.8% |
| Somchem S355 | <<locked>> | 82% | 32,401 psi | 52% | 2221 fps | 95.7% |
| Somchem S365 | <<locked>> | 90% | 29,936 psi | 48% | 2244 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 44,686 psi | 72% | 2333 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,494 psi | 63% | 2270 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,824 psi | 56% | 2251 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,650 psi | 57% | 2254 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 28,790 psi | 46% | 2119 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 92% | 37,594 psi | 60% | 2346 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 40,379 psi | 65% | 2346 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 80% | 34,301 psi | 55% | 2241 fps | 99% |
| Vihtavuori N550 | <<locked>> | 94% | 39,073 psi | 63% | 2398 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,649 psi | 54% | 2238 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 39,189 psi | 63% | 2379 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,129 psi | 58% | 2306 fps | 97% |
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 94 powders for .375 H&H Mag. loaded with the .375 | 270gr | Barnes Banded Solid RN LG. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,723 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,723 fps. Accurate 4350 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 270.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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 52, ReloadSwiss RS 60 rank at the top here: for .375 H&H Mag. with the .375 | 270gr | Barnes Banded Solid RN LG 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.