Load Specifications
Bullet Manufacturer:Rhino Bullets
Bullet Weight:300 gr
Bullet Diameter:0.374"
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 .374 | 300gr | Rhino Penetrator bullet and 114 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-16 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% | 54,433 psi | 85% | 2431 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,086 psi | 88% | 2493 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,979 psi | 77% | 2477 fps | 99.2% |
| Accurate 4064 | <<locked>> | 86% | 54,708 psi | 86% | 2480 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,114 psi | 86% | 2575 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 53,359 psi | 84% | 2651 fps | 97.4% |
| ADI AR 2206H | <<locked>> | 84% | 57,551 psi | 90% | 2549 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,317 psi | 87% | 2513 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2608 fps | 98.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 50,488 psi | 79% | 2549 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,362 psi | 88% | 2500 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,085 psi | 85% | 2618 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 56,086 psi | 88% | 2605 fps | 98.5% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 56,086 psi | 88% | 2605 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,825 psi | 87% | 2530 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,188 psi | 88% | 2552 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,753 psi | 87% | 2621 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,348 psi | 90% | 2648 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,245 psi | 87% | 2598 fps | 98.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2549 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,021 psi | 72% | 2497 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,277 psi | 63% | 2425 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,518 psi | 82% | 2664 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,566 psi | 90% | 2569 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 44,904 psi | 70% | 2484 fps | 96.4% |
| Bofors RP3 | <<locked>> | 88% | 56,681 psi | 89% | 2546 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2549 fps | 97.5% |
| Bofors RP7 | <<locked>> | 92% | 56,043 psi | 88% | 2530 fps | 99.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,682 psi | 90% | 2480 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,275 psi | 88% | 2533 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,188 psi | 90% | 2562 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 57,450 psi | 90% | 2621 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 92% | 57,551 psi | 90% | 2585 fps | 98.8% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,969 psi | 85% | 2552 fps | 96.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 52,997 psi | 83% | 2539 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 54,766 psi | 86% | 2516 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,101 psi | 88% | 2552 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,621 psi | 86% | 2546 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,940 psi | 85% | 2605 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,187 psi | 57% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,811 psi | 87% | 2516 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,303 psi | 87% | 2493 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,810 psi | 86% | 2497 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,624 psi | 90% | 2526 fps | 99.5% |
| IMR 4350 | <<locked>> | 96% | 56,869 psi | 89% | 2559 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,360 psi | 85% | 2510 fps | 99.2% |
| IMR 4831 | <<locked>> | 96% | 55,492 psi | 87% | 2566 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,595 psi | 90% | 2575 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,767 psi | 87% | 2546 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 82% | 56,362 psi | 88% | 2500 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,360 psi | 85% | 2484 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,507 psi | 89% | 2480 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,752 psi | 86% | 2490 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,711 psi | 90% | 2549 fps | 99.9% |
| Lovex S070 | <<locked>> | 94% | 55,448 psi | 87% | 2543 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,727 psi | 64% | 2349 fps | 97.9% |
| Norma 201 | <<locked>> | 84% | 56,275 psi | 88% | 2500 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,898 psi | 89% | 2493 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,405 psi | 87% | 2539 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,780 psi | 84% | 2556 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 51,692 psi | 81% | 2621 fps | 99.1% |
| Norma URP | <<locked>> | 96% | 57,406 psi | 90% | 2605 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 56,144 psi | 88% | 2562 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,304 psi | 88% | 2612 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 42,583 psi | 67% | 2421 fps | 96.4% |
| Ramshot TAC | <<locked>> | 82% | 56,492 psi | 89% | 2530 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,478 psi | 89% | 2539 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 57% | 1585 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,159 psi | 90% | 2546 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,043 psi | 89% | 2612 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,797 psi | 89% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,766 psi | 86% | 2595 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,450 psi | 90% | 2671 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 39,204 psi | 61% | 2431 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 82% | 57,188 psi | 90% | 2477 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,971 psi | 89% | 2500 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,521 psi | 89% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,563 psi | 86% | 2536 fps | 97.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,259 psi | 85% | 2585 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 92% | 56,043 psi | 88% | 2530 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,711 psi | 90% | 2549 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,360 psi | 85% | 2484 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,752 psi | 86% | 2490 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,448 psi | 87% | 2543 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,520 psi | 85% | 2549 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,216 psi | 87% | 2510 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,970 psi | 88% | 2526 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,276 psi | 90% | 2434 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,520 psi | 85% | 2395 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,595 psi | 90% | 2507 fps | 99.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,795 psi | 84% | 2579 fps | 98.3% |
| Somchem S335 | <<locked>> | 84% | 56,869 psi | 89% | 2431 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,795 psi | 86% | 2497 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,666 psi | 89% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 56,463 psi | 88% | 2530 fps | 96.6% |
| Somchem S365 | <<locked>> | 98% | 56,231 psi | 88% | 2605 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,201 psi | 87% | 2566 fps | 99% |
| Vihtavuori N133 | <<locked>> | 84% | 57,696 psi | 90% | 2415 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,130 psi | 90% | 2457 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,609 psi | 90% | 2474 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,404 psi | 85% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,217 psi | 88% | 2556 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,485 psi | 74% | 2444 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 82% | 56,898 psi | 89% | 2500 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,680 psi | 87% | 2477 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,259 psi | 87% | 2562 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,445 psi | 81% | 2566 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 52,286 psi | 82% | 2612 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,840 psi | 88% | 2526 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,319 psi | 90% | 2546 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,638 psi | 90% | 2621 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,481 psi | 65% | 2539 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,086 psi | 88% | 2533 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,648 psi | 81% | 2510 fps | 97.7% |
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% | 47,877 psi | 75% | 2352 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,209 psi | 72% | 2352 fps | 97.3% |
| Accurate 3100 | <<locked>> | 88% | 32,518 psi | 51% | 2188 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 45,339 psi | 71% | 2359 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,997 psi | 53% | 2234 fps | 97.6% |
| Accurate High Country | <<locked>> | 96% | 46,470 psi | 73% | 2546 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 50,763 psi | 80% | 2461 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,221 psi | 68% | 2336 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 43,439 psi | 68% | 2411 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 98% | 47,181 psi | 74% | 2497 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,852 psi | 83% | 2457 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,065 psi | 74% | 2516 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 40,756 psi | 64% | 2362 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 40,756 psi | 64% | 2362 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,395 psi | 68% | 2356 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,369 psi | 73% | 2415 fps | 99.9% |
| Alliant Reloder-16 | 68.1 gr | 80% | 33,678 psi | 53% | 2244 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,753 psi | 59% | 2352 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 42,815 psi | 67% | 2405 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 40,176 psi | 63% | 2398 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 24,569 psi | 39% | 2031 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 92% | 31,502 psi | 49% | 2224 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 84% | 29,660 psi | 46% | 2224 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,502 psi | 79% | 2477 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 42,032 psi | 66% | 2431 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 43,468 psi | 68% | 2365 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 40,176 psi | 63% | 2398 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 38,580 psi | 60% | 2251 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,331 psi | 85% | 2441 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,562 psi | 82% | 2487 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,903 psi | 69% | 2372 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 36,172 psi | 57% | 2277 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 41,872 psi | 66% | 2343 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 98% | 50,618 psi | 79% | 2503 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 49,487 psi | 78% | 2487 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,343 psi | 80% | 2470 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,125 psi | 49% | 2152 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,718 psi | 75% | 2454 fps | 100% |
| Hodgdon Superformance | 79.5 gr | 82% | 37,739 psi | 59% | 2333 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 42% | 1385 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,124 psi | 77% | 2428 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,822 psi | 81% | 2451 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,440 psi | 71% | 2362 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,703 psi | 75% | 2385 fps | 98.3% |
| IMR 4350 | <<locked>> | 84% | 38,986 psi | 61% | 2280 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,045 psi | 63% | 2280 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 32,938 psi | 52% | 2198 fps | 97.4% |
| IMR 4895 | <<locked>> | 80% | 47,558 psi | 75% | 2438 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 49,371 psi | 77% | 2451 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 52,852 psi | 83% | 2457 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,879 psi | 80% | 2438 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,053 psi | 78% | 2398 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,513 psi | 71% | 2362 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,550 psi | 59% | 2238 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 35,781 psi | 56% | 2218 fps | 95.5% |
| Lovex S071 | <<locked>> | 94% | 33,533 psi | 53% | 2211 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 49,719 psi | 78% | 2415 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,328 psi | 79% | 2411 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,745 psi | 72% | 2405 fps | 100% |
| Norma 204 | <<locked>> | 88% | 43,947 psi | 69% | 2405 fps | 95.8% |
| Norma MRP | <<locked>> | 90% | 36,796 psi | 58% | 2359 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 34,127 psi | 53% | 2234 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 45,788 psi | 72% | 2421 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 33,112 psi | 52% | 2218 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 39,552 psi | 62% | 2365 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 52,881 psi | 83% | 2480 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,823 psi | 83% | 2493 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,383 psi | 43% | 1417 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,063 psi | 69% | 2356 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,734 psi | 78% | 2516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,161 psi | 63% | 2402 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,721 psi | 53% | 2247 fps | 97.2% |
| ReloadSwiss RS 70 | 74.5 gr | 80% | 33,228 psi | 52% | 2254 fps | 96.4% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 36,593 psi | 57% | 2372 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 53,809 psi | 84% | 2434 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,355 psi | 74% | 2372 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,973 psi | 64% | 2320 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 47,979 psi | 75% | 2438 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 92% | 41,684 psi | 65% | 2388 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 38,580 psi | 60% | 2251 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,550 psi | 59% | 2238 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,879 psi | 80% | 2438 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,513 psi | 71% | 2362 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 35,781 psi | 56% | 2218 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,887 psi | 66% | 2365 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,532 psi | 81% | 2461 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,284 psi | 77% | 2438 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,662 psi | 79% | 2352 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,641 psi | 67% | 2244 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,782 psi | 58% | 2185 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 41,292 psi | 65% | 2382 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 50,430 psi | 79% | 2356 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,416 psi | 81% | 2454 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,394 psi | 65% | 2320 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 49,284 psi | 77% | 2431 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 30,603 psi | 48% | 2195 fps | 99.3% |
| Somchem S385 | <<locked>> | 88% | 37,289 psi | 58% | 2280 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 51,169 psi | 80% | 2343 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,311 psi | 74% | 2339 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,718 psi | 75% | 2356 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,552 psi | 62% | 2260 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 35,433 psi | 56% | 2231 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 39,088 psi | 61% | 2303 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 53,272 psi | 83% | 2457 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,919 psi | 72% | 2349 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,896 psi | 55% | 2234 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 26,571 psi | 42% | 2096 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 98% | 48,892 psi | 77% | 2559 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,925 psi | 55% | 2208 fps | 99.4% |
| Winchester 748 | <<locked>> | 80% | 53,650 psi | 84% | 2500 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 36,172 psi | 57% | 2277 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,555 psi | 38% | 2096 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,095 psi | 77% | 2441 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 41,930 psi | 66% | 2359 fps | 95.4% |
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 114 powders for .375 Rem. Ultra Mag. loaded with the .374 | 300gr | Rhino Penetrator. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,671 fps; across all powders the maximum-charge window runs from 1,549 fps to 2,671 fps. Accurate 3100 gives the best case fill at 100 %, and 114 of the 114 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 0.374" 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 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .375 Rem. Ultra Mag. with the .374 | 300gr | Rhino Penetrator 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.