Load Specifications
Bullet Manufacturer:North Fork
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 | NorthFork Bonded Core bullet and 109 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-17 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.
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% | 55,898 psi | 88% | 2454 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,435 psi | 90% | 2520 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,647 psi | 79% | 2507 fps | 99.5% |
| Accurate 4064 | <<locked>> | 86% | 56,260 psi | 88% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,739 psi | 89% | 2602 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 52,562 psi | 82% | 2631 fps | 96% |
| ADI AR 2206H | <<locked>> | 82% | 55,448 psi | 87% | 2533 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,463 psi | 88% | 2533 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,085 psi | 85% | 2589 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2582 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,638 psi | 90% | 2526 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,709 psi | 87% | 2648 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,246 psi | 90% | 2556 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,566 psi | 90% | 2579 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,450 psi | 90% | 2651 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,071 psi | 86% | 2628 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,869 psi | 89% | 2628 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,430 psi | 79% | 2582 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,630 psi | 75% | 2526 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,539 psi | 65% | 2457 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,346 psi | 85% | 2697 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,347 psi | 87% | 2549 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,166 psi | 72% | 2513 fps | 96.9% |
| Bofors RP3 | <<locked>> | 86% | 54,476 psi | 85% | 2526 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,430 psi | 79% | 2582 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 57,464 psi | 90% | 2559 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,696 psi | 90% | 2556 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,897 psi | 86% | 2539 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 55,419 psi | 87% | 2602 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 55,361 psi | 87% | 2566 fps | 98.7% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 2585 fps | 96.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,447 psi | 85% | 2569 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 82% | 56,072 psi | 88% | 2539 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,056 psi | 85% | 2533 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,101 psi | 88% | 2572 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,492 psi | 87% | 2638 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 57% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,000 psi | 89% | 2539 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,623 psi | 89% | 2513 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,014 psi | 88% | 2520 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,303 psi | 87% | 2507 fps | 99.4% |
| IMR 4350 | <<locked>> | 94% | 54,810 psi | 86% | 2543 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,767 psi | 87% | 2536 fps | 99.4% |
| IMR 4831 | <<locked>> | 96% | 57,145 psi | 90% | 2592 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,492 psi | 87% | 2556 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,261 psi | 90% | 2575 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 49,313 psi | 77% | 2556 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 82% | 57,638 psi | 90% | 2526 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,709 psi | 87% | 2507 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,667 psi | 90% | 2503 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,202 psi | 88% | 2513 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,506 psi | 87% | 2533 fps | 99.9% |
| Lovex S070 | <<locked>> | 94% | 56,768 psi | 89% | 2569 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,018 psi | 66% | 2375 fps | 98.3% |
| Norma 201 | <<locked>> | 84% | 57,566 psi | 90% | 2523 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,839 psi | 86% | 2477 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,840 psi | 89% | 2566 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,477 psi | 87% | 2589 fps | 98.4% |
| Norma MRPᴾ | <<locked>> | 100% | 53,461 psi | 84% | 2657 fps | 99.4% |
| Norma URP | <<locked>> | 94% | 55,390 psi | 87% | 2589 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 57,638 psi | 90% | 2589 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,298 psi | 77% | 2566 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 94% | 54,201 psi | 85% | 2592 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,932 psi | 69% | 2457 fps | 97.1% |
| Ramshot TAC | <<locked>> | 82% | 57,682 psi | 90% | 2552 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,840 psi | 58% | 1598 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,027 psi | 86% | 2530 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,853 psi | 86% | 2592 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,592 psi | 86% | 2621 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,623 psi | 89% | 2625 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,143 psi | 86% | 2651 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,393 psi | 63% | 2467 fps | 97% |
| Rottweil R 902 | <<locked>> | 84% | 54,897 psi | 86% | 2484 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,520 psi | 85% | 2523 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,028 psi | 88% | 2566 fps | 97.6% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2615 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 92% | 57,464 psi | 90% | 2559 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,506 psi | 87% | 2533 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,709 psi | 87% | 2507 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,202 psi | 88% | 2513 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,768 psi | 89% | 2569 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,985 psi | 88% | 2575 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,565 psi | 89% | 2536 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,305 psi | 90% | 2549 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,114 psi | 86% | 2418 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,898 psi | 88% | 2421 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,448 psi | 87% | 2490 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,506 psi | 87% | 2612 fps | 98.7% |
| Somchem S335 | <<locked>> | 82% | 54,795 psi | 86% | 2418 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,304 psi | 88% | 2523 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,491 psi | 85% | 2516 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,099 psi | 85% | 2510 fps | 96.4% |
| Somchem S365 | <<locked>> | 96% | 54,447 psi | 85% | 2589 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 2595 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 55,622 psi | 87% | 2402 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,056 psi | 86% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,259 psi | 87% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,956 psi | 88% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,653 psi | 90% | 2582 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,994 psi | 77% | 2474 fps | 98% |
| Vihtavuori N540 | <<locked>> | 86% | 56,956 psi | 89% | 2497 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,811 psi | 89% | 2589 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,316 psi | 84% | 2592 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 2648 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,609 psi | 90% | 2552 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,608 psi | 87% | 2605 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,801 psi | 67% | 2572 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,609 psi | 90% | 2559 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,374 psi | 84% | 2543 fps | 98.1% |
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% | 49,153 psi | 77% | 2375 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,239 psi | 74% | 2379 fps | 97.7% |
| Accurate 3100 | <<locked>> | 86% | 31,531 psi | 49% | 2175 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 46,557 psi | 73% | 2382 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,157 psi | 55% | 2264 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 98% | 48,979 psi | 77% | 2575 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 52,069 psi | 82% | 2487 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,237 psi | 69% | 2362 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 41,829 psi | 66% | 2392 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 98% | 48,544 psi | 76% | 2530 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,114 psi | 85% | 2484 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,443 psi | 76% | 2546 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,469 psi | 70% | 2382 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,630 psi | 75% | 2441 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,577 psi | 54% | 2274 fps | 98.2% |
| Alliant Reloder-17 | 75.3 gr | 80% | 38,986 psi | 61% | 2382 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,307 psi | 65% | 2385 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,423 psi | 65% | 2431 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,266 psi | 40% | 2060 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,401 psi | 51% | 2257 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 82% | 28,616 psi | 45% | 2201 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,634 psi | 81% | 2500 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 40,712 psi | 64% | 2415 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 44,744 psi | 70% | 2392 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,423 psi | 65% | 2431 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 39,479 psi | 62% | 2277 fps | 96% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,954 psi | 85% | 2510 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,049 psi | 71% | 2398 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 37,101 psi | 58% | 2303 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 40,263 psi | 63% | 2323 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 48,602 psi | 76% | 2484 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 47,688 psi | 75% | 2467 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 52,620 psi | 82% | 2493 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,039 psi | 50% | 2178 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,153 psi | 77% | 2480 fps | 100% |
| Hodgdon Superformance | <<locked>> | 80% | 36,201 psi | 57% | 2306 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,064 psi | 42% | 1394 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,212 psi | 79% | 2451 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,200 psi | 83% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,528 psi | 73% | 2388 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,820 psi | 77% | 2411 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 37,637 psi | 59% | 2260 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,930 psi | 64% | 2303 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 33,881 psi | 53% | 2221 fps | 97.8% |
| IMR 4895 | <<locked>> | 80% | 48,805 psi | 76% | 2464 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 47,558 psi | 75% | 2434 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 46,137 psi | 72% | 2503 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 54,114 psi | 85% | 2484 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,214 psi | 82% | 2464 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,111 psi | 80% | 2418 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,615 psi | 73% | 2385 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,479 psi | 60% | 2264 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 36,724 psi | 58% | 2244 fps | 96.1% |
| Lovex S071 | <<locked>> | 92% | 32,605 psi | 51% | 2198 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 50,865 psi | 80% | 2438 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,474 psi | 81% | 2434 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,978 psi | 74% | 2431 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,366 psi | 66% | 2385 fps | 95.6% |
| Norma MRP | <<locked>> | 88% | 35,520 psi | 56% | 2336 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 35,143 psi | 55% | 2260 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 47,137 psi | 74% | 2448 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,035 psi | 72% | 2510 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 34,040 psi | 53% | 2244 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 96% | 38,072 psi | 60% | 2346 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 54,114 psi | 85% | 2507 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,586 psi | 43% | 1430 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,266 psi | 71% | 2385 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,155 psi | 80% | 2543 fps | 100% |
| ReloadSwiss RS 60 | 75.3 gr | 80% | 41,423 psi | 65% | 2431 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,795 psi | 55% | 2277 fps | 97.7% |
| ReloadSwiss RS 70 | 76.5 gr | 80% | 34,171 psi | 54% | 2283 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 37,739 psi | 59% | 2408 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 48,486 psi | 76% | 2395 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,061 psi | 66% | 2343 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 46,282 psi | 73% | 2421 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 90% | 40,205 psi | 63% | 2369 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 39,479 psi | 62% | 2277 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,479 psi | 60% | 2264 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,214 psi | 82% | 2464 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,615 psi | 73% | 2385 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,724 psi | 58% | 2244 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,047 psi | 67% | 2388 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,881 psi | 83% | 2487 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,444 psi | 79% | 2461 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,866 psi | 81% | 2379 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,685 psi | 68% | 2264 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,623 psi | 59% | 2211 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 39,827 psi | 62% | 2365 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 51,503 psi | 81% | 2375 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,504 psi | 82% | 2477 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,453 psi | 67% | 2343 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 50,633 psi | 79% | 2461 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 31,633 psi | 50% | 2224 fps | 99.6% |
| Somchem S385 | <<locked>> | 88% | 38,363 psi | 60% | 2306 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 52,359 psi | 82% | 2362 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,631 psi | 76% | 2362 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,820 psi | 77% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,524 psi | 64% | 2283 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,535 psi | 57% | 2260 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 92% | 37,666 psi | 59% | 2283 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 47,079 psi | 74% | 2372 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,940 psi | 56% | 2260 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 27,514 psi | 43% | 2126 fps | 96% |
| Vihtavuori N560 | <<locked>> | 96% | 47,210 psi | 74% | 2539 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,752 psi | 56% | 2234 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 37,246 psi | 58% | 2306 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 23,801 psi | 37% | 2080 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,430 psi | 79% | 2467 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 40,422 psi | 63% | 2339 fps | 95.1% |
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 109 powders for .375 Rem. Ultra Mag. loaded with the .375 | 300gr | NorthFork Bonded Core. Alliant Reloder-26 delivers the highest muzzle velocity at 2,697 fps; across all powders the maximum-charge window runs from 1,558 fps to 2,697 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 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, 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-17, ReloadSwiss RS 60 rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 300gr | NorthFork Bonded Core 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.