Load Specifications
Bullet:.375 | 300gr | Hornady BTSP
Bullet Manufacturer:Hornady
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 | Hornady BTSP bullet and 102 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% | 55,085 psi | 86% | 2415 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,913 psi | 89% | 2484 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,043 psi | 89% | 2480 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,477 psi | 87% | 2503 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,405 psi | 88% | 2493 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,364 psi | 63% | 2356 fps | 96.5% |
| Accurate 4064 | <<locked>> | 92% | 57,072 psi | 89% | 2526 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 2612 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 88% | 57,522 psi | 90% | 2559 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,940 psi | 86% | 2513 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,434 psi | 88% | 2510 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 57,479 psi | 90% | 2480 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 57,305 psi | 90% | 2674 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,056 psi | 86% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,622 psi | 87% | 2556 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,346 psi | 85% | 2615 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,593 psi | 87% | 2648 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,783 psi | 61% | 2385 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,134 psi | 68% | 2526 fps | 98.5% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,435 psi | 90% | 2579 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 55,448 psi | 87% | 2546 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,637 psi | 87% | 2523 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,969 psi | 86% | 2451 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,767 psi | 87% | 2543 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,172 psi | 85% | 2582 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 57,217 psi | 90% | 2497 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 56,565 psi | 89% | 2562 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 55,956 psi | 88% | 2612 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 96% | 56,681 psi | 89% | 2575 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 86% | 54,549 psi | 85% | 2520 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,647 psi | 79% | 2503 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 57,479 psi | 90% | 2598 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 56,623 psi | 89% | 2648 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,650 psi | 56% | 1509 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,883 psi | 88% | 2523 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,737 psi | 86% | 2503 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,578 psi | 86% | 2497 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,578 psi | 86% | 2484 fps | 98.3% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,753 psi | 87% | 2546 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,580 psi | 90% | 2552 fps | 98.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,505 psi | 84% | 2556 fps | 99.8% |
| IMR 4895 | <<locked>> | 90% | 57,043 psi | 89% | 2582 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,434 psi | 88% | 2510 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,913 psi | 89% | 2500 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,334 psi | 90% | 2533 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,985 psi | 89% | 2490 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,491 psi | 85% | 2497 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,855 psi | 89% | 2546 fps | 99.4% |
| Lovex S070 | <<locked>> | 98% | 54,230 psi | 85% | 2530 fps | 98.5% |
| Norma 201 | <<locked>> | 88% | 56,246 psi | 88% | 2507 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,869 psi | 89% | 2507 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,824 psi | 86% | 2543 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 2595 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 43,366 psi | 68% | 2490 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 55,666 psi | 87% | 2598 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 55,288 psi | 87% | 2566 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,360 psi | 85% | 2598 fps | 99% |
| Ramshot TAC | <<locked>> | 86% | 56,739 psi | 89% | 2536 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,478 psi | 89% | 2552 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,406 psi | 90% | 2516 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,114 psi | 57% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,086 psi | 88% | 2490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,985 psi | 89% | 2549 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,231 psi | 88% | 2615 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,317 psi | 87% | 2644 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 2635 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,072 psi | 88% | 2664 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 86% | 57,377 psi | 90% | 2487 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,652 psi | 89% | 2503 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,317 psi | 87% | 2539 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,637 psi | 87% | 2523 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,855 psi | 89% | 2546 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,334 psi | 90% | 2533 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,491 psi | 85% | 2497 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,230 psi | 85% | 2530 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 57,058 psi | 89% | 2595 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,347 psi | 87% | 2516 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,941 psi | 88% | 2536 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,549 psi | 85% | 2408 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,476 psi | 85% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,261 psi | 90% | 2503 fps | 98.6% |
| Somchem S321 | <<locked>> | 82% | 54,215 psi | 85% | 2497 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,101 psi | 89% | 2444 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,868 psi | 86% | 2507 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,666 psi | 87% | 2536 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,922 psi | 78% | 2552 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,528 psi | 73% | 2451 fps | 96.3% |
| Vihtavuori N130 | <<locked>> | 84% | 57,624 psi | 90% | 2408 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,795 psi | 86% | 2392 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,405 psi | 88% | 2467 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,290 psi | 90% | 2487 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 57,246 psi | 90% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,766 psi | 86% | 2549 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 86% | 57,159 psi | 90% | 2513 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,347 psi | 87% | 2487 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 2602 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,467 psi | 67% | 2454 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,897 psi | 86% | 2530 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,043 psi | 89% | 2556 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,217 psi | 88% | 2615 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,693 psi | 54% | 2392 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,840 psi | 88% | 2543 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% | 48,805 psi | 76% | 2336 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,388 psi | 84% | 2441 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,553 psi | 65% | 2277 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,312 psi | 76% | 2411 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,482 psi | 68% | 2300 fps | 95.2% |
| Accurate 3100 | <<locked>> | 98% | 37,855 psi | 59% | 2310 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 39,291 psi | 62% | 2277 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,661 psi | 48% | 2169 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 44,831 psi | 70% | 2375 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,261 psi | 60% | 2244 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,891 psi | 73% | 2379 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,413 psi | 74% | 2362 fps | 100% |
| Alliant Power Pro 2000-MR | 66.9 gr | 80% | 40,683 psi | 64% | 2408 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,826 psi | 59% | 2264 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,567 psi | 64% | 2320 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,328 psi | 49% | 2182 fps | 95.3% |
| Alliant Reloder-17 | 65.9 gr | 80% | 32,605 psi | 51% | 2244 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,689 psi | 45% | 2146 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 92% | 32,851 psi | 51% | 2303 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,005 psi | 69% | 2382 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 37,449 psi | 59% | 2270 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 43,468 psi | 68% | 2336 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,733 psi | 76% | 2365 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,716 psi | 72% | 2402 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,531 psi | 79% | 2533 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 80% | 53,824 psi | 84% | 2457 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,261 psi | 60% | 2274 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 40,292 psi | 63% | 2362 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 47,050 psi | 74% | 2431 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,281 psi | 71% | 2385 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,992 psi | 42% | 2047 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,220 psi | 65% | 2362 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 42,815 psi | 67% | 2428 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 42% | 1345 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,424 psi | 68% | 2343 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 45,049 psi | 71% | 2375 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,132 psi | 63% | 2274 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,482 psi | 67% | 2290 fps | 95.8% |
| IMR 4350 | <<locked>> | 92% | 43,642 psi | 68% | 2365 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,074 psi | 63% | 2274 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 31,865 psi | 50% | 2182 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,568 psi | 65% | 2346 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 46,891 psi | 73% | 2379 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 53,156 psi | 83% | 2454 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,976 psi | 69% | 2356 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,875 psi | 70% | 2316 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 40,016 psi | 63% | 2277 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 35,027 psi | 55% | 2182 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 39,958 psi | 63% | 2300 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 44,077 psi | 69% | 2333 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,309 psi | 69% | 2336 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,958 psi | 63% | 2310 fps | 99% |
| Norma 204 | <<locked>> | 96% | 49,530 psi | 78% | 2493 fps | 95.6% |
| Norma MRP | <<locked>> | 98% | 40,524 psi | 64% | 2434 fps | 95% |
| Norma URP | <<locked>> | 82% | 31,198 psi | 49% | 2172 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 39,392 psi | 62% | 2323 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 37,014 psi | 58% | 2303 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 46,688 psi | 73% | 2388 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,267 psi | 73% | 2405 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,618 psi | 79% | 2425 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,905 psi | 42% | 1378 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,634 psi | 82% | 2448 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,740 psi | 61% | 2260 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,786 psi | 67% | 2415 fps | 99.1% |
| ReloadSwiss RS 60 | 65.9 gr | 80% | 34,693 psi | 54% | 2300 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,576 psi | 51% | 2234 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 34,969 psi | 55% | 2287 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 48,080 psi | 75% | 2362 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,989 psi | 66% | 2290 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,215 psi | 55% | 2218 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 43,468 psi | 68% | 2336 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,027 psi | 55% | 2182 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,976 psi | 69% | 2356 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,016 psi | 63% | 2277 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 39,958 psi | 63% | 2300 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,187 psi | 57% | 2264 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,107 psi | 71% | 2369 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,366 psi | 68% | 2349 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,324 psi | 71% | 2283 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,768 psi | 59% | 2169 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,539 psi | 65% | 2274 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 50,676 psi | 79% | 2451 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,005 psi | 71% | 2287 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,817 psi | 70% | 2365 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 36,187 psi | 57% | 2228 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 26,252 psi | 41% | 2083 fps | 96.6% |
| Somchem S385 | <<locked>> | 98% | 43,598 psi | 68% | 2402 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 51,155 psi | 80% | 2329 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,672 psi | 72% | 2277 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,408 psi | 65% | 2270 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,872 psi | 66% | 2277 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,272 psi | 54% | 2169 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 32,590 psi | 51% | 2172 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,036 psi | 74% | 2375 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,379 psi | 63% | 2274 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,010 psi | 50% | 2175 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 28,906 psi | 45% | 2169 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,356 psi | 48% | 2106 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 46,804 psi | 73% | 2418 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,466 psi | 63% | 2365 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,977 psi | 42% | 2162 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,728 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 102 powders for .375 Weath. Mag. loaded with the .375 | 300gr | Hornady BTSP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,674 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,674 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 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 | Hornady BTSP 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.