Load Specifications
Bullet:.375 | 300gr | Barnes Solid
Bullet Manufacturer:Barnes
Bullet Weight:300 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Weath. Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:105 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 Weath. Mag. with .375 | 300gr | Barnes Solid bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Power Pro 2000-MR.
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>> | 84% | 54,969 psi | 86% | 2411 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,014 psi | 89% | 2484 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,159 psi | 90% | 2480 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,303 psi | 87% | 2500 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,289 psi | 88% | 2490 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,437 psi | 63% | 2356 fps | 96.5% |
| Accurate 4064 | <<locked>> | 92% | 56,956 psi | 89% | 2523 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 2612 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 88% | 57,363 psi | 90% | 2556 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,056 psi | 86% | 2513 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,536 psi | 89% | 2510 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 57,551 psi | 90% | 2480 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 57,145 psi | 90% | 2671 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,940 psi | 86% | 2530 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,506 psi | 87% | 2549 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,273 psi | 85% | 2612 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,521 psi | 87% | 2644 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,885 psi | 61% | 2385 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,018 psi | 67% | 2523 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,319 psi | 90% | 2575 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 55,593 psi | 87% | 2546 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,550 psi | 87% | 2520 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,839 psi | 86% | 2448 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,898 psi | 88% | 2543 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,041 psi | 85% | 2579 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 57,305 psi | 90% | 2497 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 56,623 psi | 89% | 2562 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 55,854 psi | 88% | 2608 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 96% | 56,608 psi | 89% | 2572 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 86% | 54,665 psi | 86% | 2520 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,531 psi | 79% | 2497 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 57,566 psi | 90% | 2598 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 56,782 psi | 89% | 2648 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 56% | 1506 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,724 psi | 87% | 2520 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,578 psi | 86% | 2500 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,418 psi | 85% | 2493 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,491 psi | 85% | 2477 fps | 98.2% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,608 psi | 87% | 2543 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,435 psi | 90% | 2549 fps | 98.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 2556 fps | 99.8% |
| IMR 4895 | <<locked>> | 90% | 56,913 psi | 89% | 2579 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,536 psi | 89% | 2510 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,724 psi | 89% | 2497 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,464 psi | 90% | 2536 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,072 psi | 89% | 2490 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 57,682 psi | 90% | 2533 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,739 psi | 89% | 2543 fps | 99.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 2575 fps | 98.9% |
| Norma 201 | <<locked>> | 88% | 56,115 psi | 88% | 2503 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,695 psi | 89% | 2503 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,737 psi | 86% | 2539 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 2592 fps | 97% |
| Norma URPᴾ | <<locked>> | 100% | 55,550 psi | 87% | 2595 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 55,143 psi | 86% | 2562 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,230 psi | 85% | 2595 fps | 99% |
| Ramshot TAC | <<locked>> | 86% | 56,826 psi | 89% | 2536 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,391 psi | 88% | 2549 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,537 psi | 90% | 2516 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 57% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,956 psi | 88% | 2490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,826 psi | 89% | 2546 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,086 psi | 88% | 2612 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,405 psi | 87% | 2644 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,173 psi | 88% | 2631 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 2657 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 86% | 57,261 psi | 90% | 2484 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,739 psi | 89% | 2503 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,463 psi | 87% | 2539 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,550 psi | 87% | 2520 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,739 psi | 89% | 2543 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,464 psi | 90% | 2536 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 57,682 psi | 90% | 2533 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 2575 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 57,159 psi | 90% | 2595 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,187 psi | 86% | 2513 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,854 psi | 88% | 2533 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,447 psi | 85% | 2405 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,607 psi | 86% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,334 psi | 90% | 2503 fps | 98.6% |
| Somchem S321 | <<locked>> | 82% | 54,056 psi | 85% | 2493 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,942 psi | 89% | 2441 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,708 psi | 86% | 2503 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,753 psi | 87% | 2536 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,850 psi | 78% | 2552 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,470 psi | 73% | 2448 fps | 96.3% |
| Vihtavuori N130 | <<locked>> | 84% | 57,479 psi | 90% | 2405 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,694 psi | 86% | 2388 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,492 psi | 89% | 2467 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,377 psi | 90% | 2487 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 57,159 psi | 90% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,665 psi | 86% | 2546 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 86% | 57,058 psi | 89% | 2510 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,434 psi | 87% | 2487 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2602 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,351 psi | 66% | 2448 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,766 psi | 86% | 2526 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 56,913 psi | 89% | 2552 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,057 psi | 88% | 2612 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,650 psi | 54% | 2388 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,695 psi | 87% | 2539 fps | 100% |
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% | 48,660 psi | 76% | 2333 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,272 psi | 83% | 2438 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,394 psi | 65% | 2274 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,356 psi | 76% | 2408 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,395 psi | 68% | 2297 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 37,724 psi | 59% | 2306 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 39,175 psi | 61% | 2274 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,545 psi | 48% | 2165 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 44,918 psi | 70% | 2375 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,145 psi | 60% | 2241 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,963 psi | 74% | 2379 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,297 psi | 74% | 2359 fps | 100% |
| Alliant Power Pro 2000-MR | 66.9 gr | 80% | 40,770 psi | 64% | 2408 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,753 psi | 59% | 2264 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,611 psi | 64% | 2320 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,357 psi | 49% | 2178 fps | 95.2% |
| Alliant Reloder-17 | 65.8 gr | 80% | 32,518 psi | 51% | 2238 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,718 psi | 45% | 2146 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,070 psi | 55% | 2356 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,888 psi | 69% | 2379 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 37,507 psi | 59% | 2267 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 43,540 psi | 68% | 2336 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,617 psi | 76% | 2362 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,759 psi | 72% | 2402 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,430 psi | 79% | 2530 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 80% | 53,679 psi | 84% | 2454 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,203 psi | 60% | 2270 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 40,364 psi | 63% | 2362 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 46,949 psi | 74% | 2428 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,310 psi | 71% | 2382 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,919 psi | 42% | 2044 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,263 psi | 65% | 2362 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 42,728 psi | 67% | 2425 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,585 psi | 42% | 1345 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,497 psi | 68% | 2343 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 45,136 psi | 71% | 2375 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,030 psi | 63% | 2270 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,569 psi | 67% | 2290 fps | 95.8% |
| IMR 4350 | <<locked>> | 92% | 43,511 psi | 68% | 2359 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,569 psi | 67% | 2320 fps | 95.7% |
| IMR 4831 | <<locked>> | 84% | 31,908 psi | 50% | 2178 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,611 psi | 65% | 2346 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 46,963 psi | 74% | 2379 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 53,026 psi | 83% | 2451 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,019 psi | 69% | 2356 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,962 psi | 70% | 2316 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 40,089 psi | 63% | 2277 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 34,925 psi | 55% | 2178 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 39,871 psi | 62% | 2297 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,947 psi | 69% | 2329 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,179 psi | 69% | 2333 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,987 psi | 63% | 2310 fps | 99% |
| Norma 204 | <<locked>> | 96% | 49,400 psi | 77% | 2490 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 31,140 psi | 49% | 2169 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,479 psi | 62% | 2323 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 36,898 psi | 58% | 2300 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 46,789 psi | 73% | 2388 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,340 psi | 73% | 2405 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,502 psi | 79% | 2421 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,934 psi | 42% | 1378 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,504 psi | 82% | 2444 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,667 psi | 61% | 2257 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,656 psi | 67% | 2411 fps | 99% |
| ReloadSwiss RS 60 | 65.8 gr | 80% | 34,621 psi | 54% | 2297 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,619 psi | 51% | 2231 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,012 psi | 55% | 2287 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 47,921 psi | 75% | 2359 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,858 psi | 66% | 2287 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,273 psi | 55% | 2221 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 43,540 psi | 68% | 2336 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 34,925 psi | 55% | 2178 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,019 psi | 69% | 2356 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,089 psi | 63% | 2277 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 39,871 psi | 62% | 2297 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,085 psi | 57% | 2260 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,020 psi | 71% | 2365 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,279 psi | 68% | 2346 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,397 psi | 71% | 2283 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,797 psi | 59% | 2169 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,481 psi | 65% | 2270 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 50,575 psi | 79% | 2448 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,918 psi | 70% | 2283 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,672 psi | 70% | 2362 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 36,071 psi | 57% | 2221 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 26,165 psi | 41% | 2077 fps | 96.5% |
| Somchem S385 | <<locked>> | 98% | 43,497 psi | 68% | 2398 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 51,213 psi | 80% | 2329 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,730 psi | 72% | 2274 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,495 psi | 65% | 2270 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,930 psi | 66% | 2277 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,301 psi | 54% | 2169 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 32,489 psi | 51% | 2172 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 47,094 psi | 74% | 2375 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,277 psi | 63% | 2270 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 31,937 psi | 50% | 2172 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 28,819 psi | 45% | 2165 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,298 psi | 47% | 2103 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 46,659 psi | 73% | 2415 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,364 psi | 63% | 2362 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,718 psi | 45% | 2218 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,801 psi | 67% | 2352 fps | 99.6% |
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 101 powders for .375 Weath. Mag. loaded with the .375 | 300gr | Barnes Solid. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,671 fps; across all powders the maximum-charge window runs from 1,506 fps to 2,671 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, 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 4350, Alliant Reloder-16 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. Alliant Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .375 Weath. Mag. with the .375 | 300gr | Barnes Solid 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.