Load Specifications
Bullet:.375 | 300gr | Woodleigh FMJ
Bullet Manufacturer:Woodleigh
Bullet Weight:300 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Rem. Ultra Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:117 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:6.0
Load data in caliber .375 Rem. Ultra Mag. with .375 | 300gr | Woodleigh FMJ bullet and 100 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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,592 psi | 86% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,203 psi | 90% | 2526 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,374 psi | 84% | 2556 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 55,143 psi | 86% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,811 psi | 87% | 2602 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,421 psi | 90% | 2569 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,172 psi | 86% | 2533 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,710 psi | 89% | 2641 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,389 psi | 85% | 2638 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,259 psi | 85% | 2641 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,739 psi | 89% | 2641 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,854 psi | 88% | 2552 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,188 psi | 88% | 2572 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,318 psi | 88% | 2648 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,896 psi | 84% | 2621 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,999 psi | 88% | 2631 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,185 psi | 83% | 2635 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,140 psi | 79% | 2572 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,627 psi | 68% | 2510 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,780 psi | 84% | 2700 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,392 psi | 90% | 2589 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,631 psi | 76% | 2566 fps | 97.8% |
| Bofors RP3 | <<locked>> | 86% | 56,768 psi | 89% | 2566 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,185 psi | 83% | 2635 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 56,043 psi | 88% | 2556 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 57,217 psi | 90% | 2585 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,317 psi | 85% | 2602 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 90% | 57,638 psi | 90% | 2612 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 54,520 psi | 85% | 2585 fps | 96.9% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,130 psi | 90% | 2621 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,782 psi | 89% | 2579 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,723 psi | 86% | 2566 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,844 psi | 67% | 2539 fps | 97.1% |
| Hodgdon Superformance | <<locked>> | 90% | 54,201 psi | 85% | 2631 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,361 psi | 57% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,608 psi | 87% | 2536 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,665 psi | 86% | 2516 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,159 psi | 90% | 2546 fps | 99.7% |
| IMR 4350 | <<locked>> | 94% | 57,130 psi | 90% | 2585 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,273 psi | 85% | 2533 fps | 99.4% |
| IMR 4831 | <<locked>> | 94% | 56,188 psi | 88% | 2592 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,653 psi | 90% | 2595 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,144 psi | 88% | 2575 fps | 97.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,808 psi | 81% | 2612 fps | 97.2% |
| Lovex S060 | <<locked>> | 82% | 56,086 psi | 88% | 2500 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,781 psi | 86% | 2510 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,491 psi | 85% | 2530 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 55,608 psi | 87% | 2569 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,483 psi | 70% | 2428 fps | 98.9% |
| Norma 201 | <<locked>> | 82% | 56,043 psi | 88% | 2516 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,913 psi | 89% | 2513 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,477 psi | 87% | 2559 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,259 psi | 85% | 2585 fps | 98.4% |
| Norma MRPᴾ | <<locked>> | 100% | 56,507 psi | 89% | 2710 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 54,360 psi | 85% | 2585 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,217 psi | 88% | 2582 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,996 psi | 81% | 2625 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 94% | 56,768 psi | 89% | 2638 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,311 psi | 73% | 2513 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,014 psi | 58% | 1614 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,130 psi | 90% | 2569 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,217 psi | 90% | 2635 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,305 psi | 90% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,579 psi | 87% | 2621 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,056 psi | 85% | 2648 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,685 psi | 67% | 2533 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 84% | 56,898 psi | 89% | 2520 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,797 psi | 89% | 2562 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,766 psi | 86% | 2566 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 98% | 55,216 psi | 87% | 2618 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 90% | 56,043 psi | 88% | 2556 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,491 psi | 85% | 2530 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 54,781 psi | 86% | 2510 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,608 psi | 87% | 2569 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,882 psi | 86% | 2572 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,854 psi | 88% | 2546 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,840 psi | 89% | 2451 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,462 psi | 85% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,580 psi | 90% | 2533 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,737 psi | 86% | 2615 fps | 98.8% |
| Somchem S335 | <<locked>> | 82% | 56,507 psi | 89% | 2448 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,724 psi | 89% | 2556 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,724 psi | 89% | 2559 fps | 97.2% |
| Somchem S365 | <<locked>> | 96% | 57,290 psi | 90% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,883 psi | 88% | 2595 fps | 99.4% |
| Vihtavuori N133 | <<locked>> | 82% | 57,334 psi | 90% | 2431 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,145 psi | 90% | 2477 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,392 psi | 90% | 2493 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,520 psi | 85% | 2490 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,637 psi | 89% | 2582 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2523 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 84% | 55,593 psi | 87% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,579 psi | 87% | 2585 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2638 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 2700 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,202 psi | 88% | 2549 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,491 psi | 85% | 2602 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,310 psi | 71% | 2628 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,101 psi | 88% | 2552 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 2592 fps | 98.8% |
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 2495 | <<locked>> | 80% | 51,242 psi | 80% | 2408 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,077 psi | 69% | 2333 fps | 97.3% |
| Accurate 3100 | <<locked>> | 84% | 31,067 psi | 49% | 2172 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 48,559 psi | 76% | 2418 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,898 psi | 58% | 2306 fps | 98.7% |
| ADI AR 2206H | <<locked>> | 80% | 53,867 psi | 84% | 2523 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,788 psi | 72% | 2398 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 40,988 psi | 64% | 2388 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 44,512 psi | 70% | 2477 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,531 psi | 79% | 2589 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,031 psi | 64% | 2388 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,325 psi | 73% | 2418 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,400 psi | 77% | 2480 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,100 psi | 57% | 2316 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,828 psi | 64% | 2428 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,582 psi | 64% | 2385 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 38,116 psi | 60% | 2379 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,426 psi | 41% | 2103 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 88% | 29,994 psi | 47% | 2205 fps | 95% |
| Alliant Reloder-26 | 80.4 gr | 80% | 28,036 psi | 44% | 2195 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,737 psi | 84% | 2543 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,161 psi | 63% | 2418 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 46,717 psi | 73% | 2431 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 38,116 psi | 60% | 2379 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 41,162 psi | 65% | 2320 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 80% | 47,050 psi | 74% | 2441 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 38,914 psi | 61% | 2349 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 41,930 psi | 66% | 2369 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 94% | 47,688 psi | 75% | 2484 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 46,659 psi | 73% | 2467 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,591 psi | 53% | 2221 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,285 psi | 80% | 2520 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 37,652 psi | 59% | 2425 fps | 95% |
| Hodgdon Superformance | 83 gr | 80% | 37,898 psi | 59% | 2356 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 43% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,127 psi | 82% | 2490 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,138 psi | 75% | 2425 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,531 psi | 79% | 2454 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 36,709 psi | 58% | 2254 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,409 psi | 66% | 2346 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 35,491 psi | 56% | 2264 fps | 98.4% |
| IMR 4895 | <<locked>> | 80% | 50,691 psi | 79% | 2503 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,528 psi | 73% | 2431 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 45,295 psi | 71% | 2503 fps | 95.5% |
| Lovex S060 | <<locked>> | 80% | 52,852 psi | 83% | 2457 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,472 psi | 76% | 2425 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,016 psi | 63% | 2303 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 38,218 psi | 60% | 2287 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 32,213 psi | 50% | 2198 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 52,721 psi | 83% | 2474 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,359 psi | 84% | 2470 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,776 psi | 76% | 2467 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,292 psi | 65% | 2379 fps | 95.6% |
| Norma MRP | <<locked>> | 86% | 34,795 psi | 55% | 2333 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 36,767 psi | 58% | 2303 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 49,081 psi | 77% | 2487 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,049 psi | 71% | 2510 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 35,679 psi | 56% | 2290 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 94% | 37,318 psi | 58% | 2346 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 43% | 1444 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,934 psi | 74% | 2425 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,534 psi | 84% | 2585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,366 psi | 68% | 2470 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,622 psi | 57% | 2323 fps | 98.4% |
| ReloadSwiss RS 70 | 79.7 gr | 80% | 35,650 psi | 56% | 2329 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,072 psi | 58% | 2411 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 50,343 psi | 79% | 2434 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,845 psi | 69% | 2382 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,281 psi | 71% | 2421 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 39,581 psi | 62% | 2369 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 41,162 psi | 65% | 2320 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,016 psi | 63% | 2303 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 48,472 psi | 76% | 2425 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,218 psi | 60% | 2287 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,005 psi | 71% | 2431 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,417 psi | 82% | 2500 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,606 psi | 84% | 2411 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,295 psi | 71% | 2297 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,175 psi | 61% | 2254 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,204 psi | 61% | 2362 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 53,272 psi | 83% | 2408 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,208 psi | 69% | 2382 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 46,456 psi | 73% | 2411 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 33,199 psi | 52% | 2264 fps | 99.9% |
| Somchem S385 | <<locked>> | 86% | 37,710 psi | 59% | 2306 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 54,128 psi | 85% | 2395 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,560 psi | 79% | 2398 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,604 psi | 79% | 2411 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,192 psi | 66% | 2320 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,130 psi | 60% | 2300 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 37,086 psi | 58% | 2283 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 48,994 psi | 77% | 2408 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,681 psi | 59% | 2303 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 29,066 psi | 46% | 2172 fps | 96.9% |
| Vihtavuori N560 | <<locked>> | 94% | 46,383 psi | 73% | 2539 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,275 psi | 58% | 2274 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 39,059 psi | 61% | 2352 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,380 psi | 37% | 2077 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,417 psi | 82% | 2507 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 39,595 psi | 62% | 2336 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 100 powders for .375 Rem. Ultra Mag. loaded with the .375 | 300gr | Woodleigh FMJ. Norma MRP delivers the highest muzzle velocity at 2,710 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,710 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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 | 300gr | Woodleigh FMJ 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.