Load Specifications
Load data in caliber .375 Rem. Ultra Mag. with .375 | 300gr | Alaska Bullet Works Kodiak PP SPBC 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,723 psi | 86% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,956 psi | 88% | 2520 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,621 psi | 84% | 2559 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 55,259 psi | 87% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,956 psi | 88% | 2605 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,680 psi | 87% | 2690 fps | 97% |
| ADI AR 2206H | <<locked>> | 82% | 57,522 psi | 90% | 2572 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,259 psi | 87% | 2533 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,811 psi | 89% | 2644 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2641 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,346 psi | 85% | 2644 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,115 psi | 88% | 2556 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,289 psi | 88% | 2575 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,594 psi | 89% | 2651 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,186 psi | 85% | 2628 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,028 psi | 88% | 2635 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 2638 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,415 psi | 79% | 2575 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,845 psi | 69% | 2513 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,867 psi | 84% | 2700 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,696 psi | 90% | 2592 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2569 fps | 97.8% |
| Bofors RP3 | <<locked>> | 86% | 56,884 psi | 89% | 2569 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 2638 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 56,318 psi | 88% | 2559 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 57,290 psi | 90% | 2585 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,375 psi | 85% | 2602 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 88% | 54,201 psi | 85% | 2566 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 98% | 54,607 psi | 86% | 2589 fps | 97% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,174 psi | 90% | 2625 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,884 psi | 89% | 2579 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,824 psi | 86% | 2569 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,902 psi | 67% | 2543 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 90% | 54,505 psi | 85% | 2635 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,390 psi | 57% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,709 psi | 87% | 2536 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,781 psi | 86% | 2520 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,421 psi | 90% | 2552 fps | 99.7% |
| IMR 4350 | <<locked>> | 94% | 57,203 psi | 90% | 2589 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,563 psi | 86% | 2536 fps | 99.4% |
| IMR 4831 | <<locked>> | 94% | 56,246 psi | 88% | 2595 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,157 psi | 85% | 2552 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,231 psi | 88% | 2579 fps | 97.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,895 psi | 81% | 2615 fps | 97.2% |
| Lovex S060 | <<locked>> | 82% | 56,202 psi | 88% | 2500 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,071 psi | 86% | 2513 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,592 psi | 86% | 2533 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 55,912 psi | 88% | 2572 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,556 psi | 70% | 2431 fps | 99% |
| Norma 201 | <<locked>> | 82% | 56,159 psi | 88% | 2520 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,029 psi | 89% | 2516 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,579 psi | 87% | 2562 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,360 psi | 85% | 2589 fps | 98.5% |
| Norma MRPᴾ | <<locked>> | 100% | 56,739 psi | 89% | 2713 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 54,607 psi | 86% | 2592 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,289 psi | 88% | 2585 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,272 psi | 82% | 2628 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 94% | 57,058 psi | 89% | 2641 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,499 psi | 73% | 2516 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 58% | 1617 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,232 psi | 90% | 2572 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,334 psi | 90% | 2635 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,609 psi | 90% | 2667 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,695 psi | 87% | 2625 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,157 psi | 85% | 2651 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,743 psi | 67% | 2533 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 84% | 57,014 psi | 89% | 2523 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,942 psi | 89% | 2562 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,013 psi | 86% | 2569 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 98% | 55,288 psi | 87% | 2621 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 90% | 56,318 psi | 88% | 2559 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,592 psi | 86% | 2533 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 55,071 psi | 86% | 2513 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,912 psi | 88% | 2572 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,955 psi | 86% | 2575 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,956 psi | 88% | 2546 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,971 psi | 89% | 2454 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,563 psi | 86% | 2418 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,201 psi | 85% | 2490 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,795 psi | 86% | 2618 fps | 98.8% |
| Somchem S335 | <<locked>> | 82% | 56,608 psi | 89% | 2451 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,000 psi | 89% | 2562 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,753 psi | 89% | 2562 fps | 97.3% |
| Somchem S365 | <<locked>> | 96% | 57,624 psi | 90% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,941 psi | 88% | 2598 fps | 99.4% |
| Vihtavuori N133 | <<locked>> | 82% | 57,464 psi | 90% | 2434 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,276 psi | 90% | 2480 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,493 psi | 90% | 2493 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,636 psi | 86% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,695 psi | 89% | 2582 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,706 psi | 81% | 2526 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 84% | 55,709 psi | 87% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,869 psi | 88% | 2592 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,449 psi | 88% | 2644 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 2703 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,420 psi | 88% | 2552 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,578 psi | 86% | 2605 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,542 psi | 71% | 2631 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,188 psi | 88% | 2556 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 2595 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% | 51,387 psi | 81% | 2411 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,110 psi | 77% | 2421 fps | 98.3% |
| Accurate 3100 | <<locked>> | 84% | 31,169 psi | 49% | 2175 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 48,689 psi | 76% | 2421 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,014 psi | 58% | 2310 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 96% | 48,327 psi | 76% | 2579 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 53,969 psi | 85% | 2526 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,905 psi | 72% | 2402 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,046 psi | 64% | 2392 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 44,570 psi | 70% | 2477 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,633 psi | 79% | 2592 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,441 psi | 73% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,516 psi | 78% | 2484 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,201 psi | 57% | 2320 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,930 psi | 64% | 2428 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,640 psi | 64% | 2385 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 38,218 psi | 60% | 2379 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,513 psi | 42% | 2106 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 88% | 30,037 psi | 47% | 2208 fps | 95.1% |
| Alliant Reloder-26 | 80.7 gr | 80% | 28,210 psi | 44% | 2201 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 54,012 psi | 85% | 2546 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,263 psi | 63% | 2418 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 46,818 psi | 73% | 2434 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 38,218 psi | 60% | 2379 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 41,249 psi | 65% | 2323 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 80% | 47,152 psi | 74% | 2444 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 39,015 psi | 61% | 2352 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 42,032 psi | 66% | 2369 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 94% | 47,718 psi | 75% | 2487 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 46,717 psi | 73% | 2470 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,707 psi | 53% | 2224 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,387 psi | 81% | 2523 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 37,695 psi | 59% | 2428 fps | 95.1% |
| Hodgdon Superformance | 83.2 gr | 80% | 37,956 psi | 59% | 2359 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 43% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,243 psi | 82% | 2490 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,254 psi | 76% | 2428 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,633 psi | 79% | 2457 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 36,796 psi | 58% | 2257 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,511 psi | 67% | 2346 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 35,737 psi | 56% | 2270 fps | 98.5% |
| IMR 4895 | <<locked>> | 80% | 50,807 psi | 80% | 2507 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,601 psi | 73% | 2434 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 45,353 psi | 71% | 2507 fps | 95.5% |
| Lovex S060 | <<locked>> | 80% | 52,968 psi | 83% | 2461 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,588 psi | 76% | 2428 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,118 psi | 63% | 2306 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 38,319 psi | 60% | 2290 fps | 96.9% |
| Lovex S071 | <<locked>> | 90% | 32,314 psi | 51% | 2198 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 52,837 psi | 83% | 2477 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,490 psi | 84% | 2474 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,878 psi | 77% | 2470 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,510 psi | 65% | 2382 fps | 95.7% |
| Norma MRP | <<locked>> | 86% | 35,027 psi | 55% | 2339 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 36,869 psi | 58% | 2306 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 49,168 psi | 77% | 2490 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,310 psi | 71% | 2516 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 35,766 psi | 56% | 2293 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 94% | 37,521 psi | 59% | 2349 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,731 psi | 43% | 1447 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,166 psi | 74% | 2428 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,650 psi | 84% | 2589 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,468 psi | 68% | 2474 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,767 psi | 58% | 2326 fps | 98.5% |
| ReloadSwiss RS 70 | 79.9 gr | 80% | 35,737 psi | 56% | 2333 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 34,766 psi | 54% | 2356 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 50,459 psi | 79% | 2438 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,961 psi | 69% | 2385 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,397 psi | 71% | 2421 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 88% | 39,697 psi | 62% | 2369 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 41,249 psi | 65% | 2323 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,118 psi | 63% | 2306 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 48,588 psi | 76% | 2428 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,319 psi | 60% | 2290 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,136 psi | 71% | 2434 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,518 psi | 82% | 2503 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,679 psi | 84% | 2415 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,411 psi | 71% | 2300 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,262 psi | 62% | 2254 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,334 psi | 62% | 2365 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 53,388 psi | 84% | 2411 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,309 psi | 69% | 2385 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 46,514 psi | 73% | 2411 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 33,301 psi | 52% | 2267 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 35,491 psi | 56% | 2260 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 54,259 psi | 85% | 2398 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,705 psi | 79% | 2402 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,778 psi | 80% | 2411 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,308 psi | 66% | 2320 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,232 psi | 60% | 2303 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 37,159 psi | 58% | 2287 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 49,095 psi | 77% | 2411 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,826 psi | 59% | 2306 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 29,167 psi | 46% | 2175 fps | 97% |
| Vihtavuori N560 | <<locked>> | 94% | 46,441 psi | 73% | 2543 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,507 psi | 59% | 2277 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 39,160 psi | 61% | 2356 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,438 psi | 37% | 2077 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,562 psi | 82% | 2510 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 39,842 psi | 62% | 2343 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 | Alaska Bullet Works Kodiak PP SPBC. Norma MRP delivers the highest muzzle velocity at 2,713 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,713 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, 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 | 300gr | Alaska Bullet Works Kodiak PP SPBC 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.