Load Specifications
Bullet:.375 | 300gr | Atomic 29 HP
Bullet Manufacturer:Atomic 29
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:1:16.0
Load data in caliber .375 Rem. Ultra Mag. with .375 | 300gr | Atomic 29 HP bullet and 112 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-16.
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 2015 | <<locked>> | 82% | 57,043 psi | 89% | 2434 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,057 psi | 88% | 2457 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,853 psi | 86% | 2480 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,268 psi | 74% | 2457 fps | 99.1% |
| Accurate 4064 | <<locked>> | 88% | 56,536 psi | 89% | 2507 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,261 psi | 90% | 2605 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 51,967 psi | 81% | 2635 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 84% | 56,304 psi | 88% | 2539 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,653 psi | 90% | 2546 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,027 psi | 86% | 2595 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,245 psi | 87% | 2493 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,840 psi | 89% | 2461 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,855 psi | 89% | 2661 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,868 psi | 86% | 2595 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,520 psi | 85% | 2520 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,882 psi | 86% | 2539 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,549 psi | 85% | 2608 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,825 psi | 87% | 2635 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,056 psi | 85% | 2585 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2533 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,701 psi | 70% | 2484 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,073 psi | 61% | 2405 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2644 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,449 psi | 88% | 2559 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 43,613 psi | 68% | 2467 fps | 96.1% |
| Bofors RP3 | <<locked>> | 88% | 55,158 psi | 86% | 2533 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2533 fps | 97.2% |
| Bofors RP7 | <<locked>> | 92% | 54,795 psi | 86% | 2516 fps | 98.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,594 psi | 89% | 2470 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,926 psi | 86% | 2520 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,840 psi | 88% | 2549 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 56,159 psi | 88% | 2608 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 92% | 56,391 psi | 88% | 2572 fps | 98.7% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 52,794 psi | 83% | 2539 fps | 96% |
| Hodgdon H4895 | <<locked>> | 84% | 56,956 psi | 89% | 2546 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,737 psi | 86% | 2539 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,087 psi | 89% | 2582 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,666 psi | 89% | 2644 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,882 psi | 56% | 1545 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,694 psi | 86% | 2507 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,609 psi | 90% | 2523 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,116 psi | 90% | 2530 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,521 psi | 89% | 2516 fps | 99.4% |
| IMR 4350 | <<locked>> | 96% | 55,724 psi | 87% | 2546 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,869 psi | 89% | 2546 fps | 99.4% |
| IMR 4831 | <<locked>> | 98% | 57,696 psi | 90% | 2595 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,304 psi | 88% | 2566 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2533 fps | 96.6% |
| IMR 8208 XBR | <<locked>> | 82% | 55,245 psi | 87% | 2493 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,565 psi | 89% | 2513 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,434 psi | 87% | 2474 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,855 psi | 89% | 2520 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,376 psi | 88% | 2539 fps | 99.9% |
| Lovex S070 | <<locked>> | 96% | 57,566 psi | 90% | 2575 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,160 psi | 61% | 2326 fps | 97.5% |
| Norma 201 | <<locked>> | 84% | 54,853 psi | 86% | 2487 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,651 psi | 87% | 2484 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,609 psi | 90% | 2572 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,333 psi | 88% | 2595 fps | 98.3% |
| Norma MRPᴾ | <<locked>> | 100% | 50,299 psi | 79% | 2605 fps | 98.9% |
| Norma URP | <<locked>> | 96% | 56,072 psi | 88% | 2592 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 54,868 psi | 86% | 2552 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,781 psi | 86% | 2595 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 41,162 psi | 65% | 2402 fps | 96% |
| Ramshot TAC | <<locked>> | 82% | 55,317 psi | 87% | 2520 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,317 psi | 87% | 2530 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,492 psi | 57% | 1585 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,927 psi | 88% | 2536 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,666 psi | 87% | 2598 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,506 psi | 87% | 2628 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,130 psi | 90% | 2628 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,159 psi | 88% | 2657 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 55,608 psi | 87% | 2464 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,550 psi | 87% | 2487 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,027 psi | 86% | 2526 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,956 psi | 89% | 2569 fps | 97.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 2569 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 92% | 54,795 psi | 86% | 2516 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,376 psi | 88% | 2539 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,565 psi | 89% | 2513 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,855 psi | 89% | 2520 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,566 psi | 90% | 2575 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,913 psi | 89% | 2582 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,896 psi | 84% | 2497 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,795 psi | 86% | 2516 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,130 psi | 88% | 2425 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,884 psi | 89% | 2428 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,347 psi | 88% | 2497 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,460 psi | 82% | 2566 fps | 98.1% |
| Somchem S335 | <<locked>> | 84% | 55,593 psi | 87% | 2425 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,435 psi | 90% | 2533 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,259 psi | 87% | 2523 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 55,027 psi | 86% | 2516 fps | 96.4% |
| Somchem S365 | <<locked>> | 98% | 54,795 psi | 86% | 2592 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,780 psi | 84% | 2549 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 84% | 56,579 psi | 89% | 2408 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,767 psi | 87% | 2448 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,434 psi | 88% | 2467 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,637 psi | 89% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,897 psi | 86% | 2543 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,224 psi | 72% | 2428 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 82% | 55,680 psi | 87% | 2490 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,447 psi | 85% | 2464 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,435 psi | 90% | 2592 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,908 psi | 78% | 2549 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 50,981 psi | 80% | 2595 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,694 psi | 86% | 2516 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,057 psi | 88% | 2533 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,347 psi | 88% | 2612 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,987 psi | 63% | 2520 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,839 psi | 86% | 2523 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,430 psi | 79% | 2493 fps | 97.5% |
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% | 53,548 psi | 84% | 2395 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,006 psi | 72% | 2336 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,034 psi | 71% | 2339 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 33,344 psi | 52% | 2215 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 43,598 psi | 68% | 2339 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,518 psi | 51% | 2208 fps | 97.2% |
| Accurate High Country | <<locked>> | 96% | 45,107 psi | 71% | 2526 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 49,559 psi | 78% | 2451 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,163 psi | 66% | 2323 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 42,337 psi | 66% | 2395 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,706 psi | 81% | 2448 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,185 psi | 83% | 2421 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,905 psi | 72% | 2503 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 42,221 psi | 66% | 2395 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,148 psi | 66% | 2343 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,092 psi | 71% | 2398 fps | 99.8% |
| Alliant Reloder-16 | 68 gr | 80% | 32,605 psi | 51% | 2224 fps | 97.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,724 psi | 58% | 2339 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 41,669 psi | 65% | 2388 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 41,495 psi | 65% | 2428 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 25,005 psi | 39% | 2051 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 94% | 32,285 psi | 51% | 2251 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 86% | 30,516 psi | 48% | 2254 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,342 psi | 77% | 2464 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 40,756 psi | 64% | 2415 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 42,018 psi | 66% | 2349 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 41,495 psi | 65% | 2428 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 37,507 psi | 59% | 2238 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,243 psi | 83% | 2431 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,242 psi | 80% | 2474 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,757 psi | 67% | 2359 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 34,969 psi | 55% | 2257 fps | 95% |
| Hodgdon H4350 | <<locked>> | 82% | 40,770 psi | 64% | 2329 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 98% | 49,269 psi | 77% | 2487 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 50,067 psi | 78% | 2457 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,052 psi | 47% | 2136 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,673 psi | 73% | 2444 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 36,608 psi | 57% | 2313 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 42% | 1381 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,037 psi | 75% | 2415 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,517 psi | 79% | 2441 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,324 psi | 69% | 2349 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,659 psi | 73% | 2372 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 37,898 psi | 59% | 2264 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,001 psi | 61% | 2264 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 31,647 psi | 50% | 2175 fps | 96.9% |
| IMR 4895 | <<locked>> | 80% | 46,282 psi | 73% | 2425 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 48,283 psi | 76% | 2441 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 51,706 psi | 81% | 2448 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,371 psi | 77% | 2425 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,008 psi | 77% | 2385 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,208 psi | 69% | 2349 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,289 psi | 57% | 2218 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 34,548 psi | 54% | 2198 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 32,039 psi | 50% | 2185 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 48,385 psi | 76% | 2402 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,052 psi | 77% | 2402 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,454 psi | 70% | 2388 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 42,801 psi | 67% | 2388 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 35,563 psi | 56% | 2336 fps | 95% |
| Norma URP | <<locked>> | 80% | 32,895 psi | 52% | 2215 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 44,585 psi | 70% | 2408 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 34,185 psi | 54% | 2247 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 98% | 38,290 psi | 60% | 2346 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 51,750 psi | 81% | 2470 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,648 psi | 81% | 2484 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 43% | 1414 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,018 psi | 67% | 2343 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,428 psi | 76% | 2500 fps | 100% |
| ReloadSwiss RS 60 | 73.3 gr | 80% | 39,102 psi | 61% | 2388 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,387 psi | 51% | 2228 fps | 96.8% |
| ReloadSwiss RS 70 | 74.4 gr | 80% | 32,097 psi | 50% | 2231 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 52,272 psi | 82% | 2421 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,006 psi | 72% | 2359 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,523 psi | 62% | 2300 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 46,833 psi | 73% | 2425 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 40,451 psi | 63% | 2372 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 37,507 psi | 59% | 2238 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,289 psi | 57% | 2218 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,371 psi | 77% | 2425 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,208 psi | 69% | 2349 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 34,548 psi | 54% | 2198 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,712 psi | 64% | 2349 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,227 psi | 79% | 2448 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,124 psi | 75% | 2425 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,545 psi | 78% | 2346 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,524 psi | 65% | 2231 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 35,563 psi | 56% | 2169 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 40,074 psi | 63% | 2365 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 49,197 psi | 77% | 2346 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,183 psi | 79% | 2441 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,089 psi | 63% | 2303 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 51,547 psi | 81% | 2467 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 29,472 psi | 46% | 2175 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 38,377 psi | 60% | 2306 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 50,067 psi | 78% | 2333 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,006 psi | 72% | 2329 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,557 psi | 73% | 2343 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,276 psi | 60% | 2244 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 34,243 psi | 54% | 2211 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 40,408 psi | 63% | 2333 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 52,083 psi | 82% | 2448 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,875 psi | 70% | 2339 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,794 psi | 53% | 2215 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 27,035 psi | 42% | 2116 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 98% | 47,645 psi | 75% | 2543 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,837 psi | 53% | 2192 fps | 99.2% |
| Winchester 748 | <<locked>> | 80% | 52,417 psi | 82% | 2490 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 34,969 psi | 55% | 2257 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 86% | 24,990 psi | 39% | 2119 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,863 psi | 75% | 2431 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 40,741 psi | 64% | 2339 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 112 powders for .375 Rem. Ultra Mag. loaded with the .375 | 300gr | Atomic 29 HP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,661 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,661 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, 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 High Country, ADI AR 2209 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 60, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 300gr | Atomic 29 HP 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.