Load Specifications
Load data in caliber .375 Rem. Ultra Mag. with .375 | 305gr | Hammer Stone Hammer bullet and 104 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.
A valid access license is required to use the Personalized Load Calculator.
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 2495 | <<locked>> | 84% | 57,421 psi | 90% | 2457 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,129 psi | 86% | 2480 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,373 psi | 82% | 2516 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 54,244 psi | 85% | 2467 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,665 psi | 86% | 2562 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,244 psi | 85% | 2641 fps | 96.7% |
| ADI AR 2206H | <<locked>> | 82% | 56,579 psi | 89% | 2533 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,740 psi | 90% | 2536 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,695 psi | 87% | 2602 fps | 98.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,388 psi | 84% | 2595 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,188 psi | 90% | 2654 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,129 psi | 86% | 2516 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,245 psi | 87% | 2533 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,434 psi | 87% | 2612 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,782 psi | 89% | 2631 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,955 psi | 86% | 2592 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 2595 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 2533 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,859 psi | 67% | 2470 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 56,449 psi | 88% | 2707 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,623 psi | 89% | 2552 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,732 psi | 75% | 2526 fps | 97.6% |
| Bofors RP3 | <<locked>> | 86% | 55,883 psi | 88% | 2530 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,069 psi | 82% | 2595 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 55,376 psi | 87% | 2520 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 86% | 56,405 psi | 88% | 2546 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,985 psi | 89% | 2612 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 90% | 56,797 psi | 89% | 2572 fps | 99.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,305 psi | 90% | 2598 fps | 97.4% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,072 psi | 88% | 2582 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 82% | 57,261 psi | 90% | 2539 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,709 psi | 87% | 2539 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,508 psi | 90% | 2575 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,018 psi | 66% | 2497 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 92% | 57,290 psi | 90% | 2644 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,303 psi | 57% | 1555 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,839 psi | 86% | 2497 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,377 psi | 90% | 2523 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,507 psi | 89% | 2513 fps | 99.6% |
| IMR 4350 | <<locked>> | 94% | 56,202 psi | 88% | 2549 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,927 psi | 89% | 2543 fps | 99.6% |
| IMR 4831 | <<locked>> | 94% | 55,143 psi | 86% | 2552 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,652 psi | 89% | 2556 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,230 psi | 87% | 2536 fps | 97.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,778 psi | 80% | 2569 fps | 96.9% |
| Lovex D073.6 | <<locked>> | 82% | 57,174 psi | 90% | 2507 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,463 psi | 87% | 2464 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,406 psi | 90% | 2513 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,971 psi | 89% | 2536 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 54,795 psi | 86% | 2530 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,424 psi | 68% | 2388 fps | 98.8% |
| Norma 201 | <<locked>> | 82% | 55,361 psi | 87% | 2480 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,014 psi | 88% | 2477 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,534 psi | 85% | 2520 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,971 psi | 89% | 2595 fps | 98.8% |
| Norma MRPᴾ | <<locked>> | 100% | 55,201 psi | 87% | 2667 fps | 99.7% |
| Norma URP | <<locked>> | 94% | 57,000 psi | 89% | 2595 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,245 psi | 87% | 2546 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,836 psi | 80% | 2579 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 55,695 psi | 87% | 2598 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,353 psi | 71% | 2470 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,970 psi | 58% | 1591 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,231 psi | 88% | 2533 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,405 psi | 88% | 2595 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,318 psi | 88% | 2625 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,462 psi | 85% | 2582 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,811 psi | 89% | 2657 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,771 psi | 65% | 2490 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,028 psi | 88% | 2480 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,927 psi | 88% | 2526 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,435 psi | 90% | 2572 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 98% | 54,128 psi | 85% | 2579 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 55,376 psi | 87% | 2520 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,971 psi | 89% | 2536 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,174 psi | 90% | 2507 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,406 psi | 90% | 2513 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,795 psi | 86% | 2530 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,580 psi | 90% | 2579 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,187 psi | 86% | 2510 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,275 psi | 88% | 2418 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,014 psi | 89% | 2418 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,782 psi | 89% | 2497 fps | 99.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,334 psi | 90% | 2621 fps | 99.1% |
| Somchem S335 | <<locked>> | 82% | 55,883 psi | 88% | 2415 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,624 psi | 90% | 2526 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,840 psi | 88% | 2520 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,579 psi | 87% | 2516 fps | 97% |
| Somchem S365 | <<locked>> | 96% | 56,217 psi | 88% | 2592 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,694 psi | 86% | 2556 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 56,768 psi | 89% | 2398 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,376 psi | 88% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,623 psi | 89% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,246 psi | 90% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,593 psi | 87% | 2539 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,589 psi | 79% | 2484 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 84% | 54,781 psi | 86% | 2457 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,621 psi | 86% | 2549 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,998 psi | 86% | 2602 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 2657 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,230 psi | 87% | 2513 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,159 psi | 90% | 2612 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,251 psi | 69% | 2585 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,259 psi | 87% | 2516 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,042 psi | 86% | 2552 fps | 98.6% |
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 2495 | <<locked>> | 80% | 50,459 psi | 79% | 2375 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,399 psi | 76% | 2385 fps | 98.2% |
| Accurate 3100 | <<locked>> | 86% | 32,605 psi | 51% | 2185 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 47,790 psi | 75% | 2382 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,230 psi | 57% | 2270 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 96% | 47,065 psi | 74% | 2533 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 53,200 psi | 83% | 2490 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,252 psi | 71% | 2362 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 40,205 psi | 63% | 2352 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 46,702 psi | 73% | 2490 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,647 psi | 78% | 2549 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,614 psi | 71% | 2385 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,718 psi | 76% | 2444 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,505 psi | 56% | 2280 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,132 psi | 63% | 2392 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 39,929 psi | 63% | 2349 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 39,929 psi | 63% | 2392 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,976 psi | 41% | 2070 fps | 96.6% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,386 psi | 49% | 2224 fps | 95.8% |
| Alliant Reloder-26 | 80.1 gr | 82% | 29,515 psi | 46% | 2218 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,910 psi | 83% | 2503 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 39,392 psi | 62% | 2379 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 45,861 psi | 72% | 2395 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 39,929 psi | 63% | 2392 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 40,553 psi | 64% | 2287 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 80% | 46,267 psi | 73% | 2405 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 38,218 psi | 60% | 2313 fps | 96.7% |
| Hodgdon H4350 | <<locked>> | 80% | 41,234 psi | 65% | 2329 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 94% | 46,746 psi | 73% | 2444 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 48,965 psi | 77% | 2480 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 53,766 psi | 84% | 2497 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,967 psi | 52% | 2188 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,328 psi | 79% | 2484 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 39,407 psi | 62% | 2441 fps | 95.8% |
| Hodgdon Superformance | 80.6 gr | 80% | 37,159 psi | 58% | 2320 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 43% | 1388 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,474 psi | 81% | 2454 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,587 psi | 75% | 2392 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,792 psi | 78% | 2415 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 36,187 psi | 57% | 2221 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,843 psi | 66% | 2310 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 34,896 psi | 55% | 2231 fps | 98.3% |
| IMR 4895 | <<locked>> | 80% | 49,966 psi | 78% | 2467 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 45,876 psi | 72% | 2398 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 44,425 psi | 70% | 2464 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 53,447 psi | 84% | 2464 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,141 psi | 82% | 2421 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,718 psi | 75% | 2388 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,392 psi | 62% | 2267 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 37,652 psi | 59% | 2251 fps | 96.7% |
| Lovex S071 | <<locked>> | 90% | 31,633 psi | 50% | 2165 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 52,011 psi | 82% | 2438 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,620 psi | 82% | 2434 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,066 psi | 75% | 2431 fps | 100% |
| Norma 204 | <<locked>> | 84% | 40,611 psi | 64% | 2343 fps | 95.4% |
| Norma MRP | <<locked>> | 86% | 34,243 psi | 54% | 2300 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,129 psi | 57% | 2267 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 80% | 48,196 psi | 76% | 2451 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 44,280 psi | 69% | 2470 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 35,070 psi | 55% | 2257 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 94% | 36,637 psi | 57% | 2310 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,673 psi | 43% | 1424 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,267 psi | 73% | 2388 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,649 psi | 83% | 2546 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,656 psi | 67% | 2434 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,955 psi | 56% | 2287 fps | 98.3% |
| ReloadSwiss RS 70 | 77.4 gr | 80% | 34,998 psi | 55% | 2290 fps | 97.7% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 36,376 psi | 57% | 2372 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 49,588 psi | 78% | 2398 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,149 psi | 68% | 2349 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 44,512 psi | 70% | 2382 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 38,885 psi | 61% | 2333 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 40,553 psi | 64% | 2287 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,392 psi | 62% | 2267 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,447 psi | 84% | 2464 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,718 psi | 75% | 2388 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,652 psi | 59% | 2251 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,280 psi | 69% | 2395 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,677 psi | 81% | 2464 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,924 psi | 83% | 2375 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,701 psi | 70% | 2264 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,638 psi | 61% | 2218 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 38,508 psi | 60% | 2326 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 52,562 psi | 82% | 2375 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,780 psi | 84% | 2480 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,540 psi | 68% | 2346 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 48,805 psi | 76% | 2421 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 32,605 psi | 51% | 2231 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 36,999 psi | 58% | 2270 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 53,476 psi | 84% | 2362 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,879 psi | 78% | 2365 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,908 psi | 78% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,568 psi | 65% | 2283 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,550 psi | 59% | 2267 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 92% | 38,827 psi | 61% | 2297 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 48,283 psi | 76% | 2375 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,043 psi | 58% | 2270 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 28,442 psi | 45% | 2136 fps | 96.7% |
| Vihtavuori N560 | <<locked>> | 94% | 45,368 psi | 71% | 2497 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,680 psi | 57% | 2238 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 38,363 psi | 60% | 2316 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 22,974 psi | 36% | 2041 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,706 psi | 81% | 2470 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 38,957 psi | 61% | 2303 fps | 95% |
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 111 powders for .375 Rem. Ultra Mag. loaded with the .375 | 305gr | Hammer Stone Hammer. Alliant Reloder-26 delivers the highest muzzle velocity at 2,707 fps; across all powders the maximum-charge window runs from 1,555 fps to 2,707 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. The 305.0 gr projectile in 0.375" calls for a 1:17.0 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 Rem. Ultra Mag. with the .375 | 305gr | Hammer Stone Hammer they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.