Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 250gr | Speer TBBC bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and SNPE Vectan SP 11.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 41,437 psi | 88% | 2474 fps | 100% |
| Accurate 4064 | <<locked>> | 88% | 41,524 psi | 88% | 2507 fps | 99.9% |
| Accurate 4350 | <<locked>> | 98% | 42,293 psi | 90% | 2582 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 82% | 40,683 psi | 86% | 2474 fps | 97% |
| ADI AR 2208 | <<locked>> | 88% | 41,626 psi | 88% | 2477 fps | 96.4% |
| Alliant AR-Comp | <<locked>> | 82% | 41,756 psi | 89% | 2490 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 41,930 psi | 89% | 2592 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 40,582 psi | 86% | 2493 fps | 97.9% |
| Alliant Reloder-15 | <<locked>> | 86% | 41,205 psi | 87% | 2507 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 92% | 40,306 psi | 86% | 2569 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 42,134 psi | 89% | 2520 fps | 96.1% |
| Bofors RP3 | <<locked>> | 88% | 40,234 psi | 85% | 2500 fps | 97.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 40,799 psi | 87% | 2503 fps | 98.7% |
| Hodgdon H4895 | <<locked>> | 82% | 40,944 psi | 87% | 2487 fps | 97.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,698 psi | 88% | 2536 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 41,742 psi | 89% | 2552 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,708 psi | 74% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 41,989 psi | 89% | 2493 fps | 97.8% |
| IMR 3031 | <<locked>> | 84% | 42,467 psi | 90% | 2536 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 41,089 psi | 87% | 2461 fps | 96.6% |
| IMR 4895 | <<locked>> | 86% | 42,192 psi | 90% | 2539 fps | 97.5% |
| Lovex D073.6 | <<locked>> | 84% | 41,611 psi | 88% | 2507 fps | 99.5% |
| Lovex S060 | <<locked>> | 82% | 41,350 psi | 88% | 2425 fps | 97.2% |
| Lovex S062 | <<locked>> | 86% | 40,596 psi | 86% | 2464 fps | 98.2% |
| Norma 201 | <<locked>> | 84% | 42,351 psi | 90% | 2484 fps | 98.5% |
| Norma 202 | <<locked>> | 84% | 42,395 psi | 90% | 2493 fps | 99.8% |
| Norma 203B | <<locked>> | 86% | 40,524 psi | 86% | 2497 fps | 97% |
| Ramshot Big Game | <<locked>> | 86% | 40,161 psi | 85% | 2510 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 41,655 psi | 88% | 2503 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,041 psi | 74% | 1654 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 40,132 psi | 85% | 2549 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 40,263 psi | 85% | 2582 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 84% | 40,248 psi | 85% | 2434 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 90% | 40,132 psi | 85% | 2490 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 41,611 psi | 88% | 2507 fps | 99.5% |
| Shooters World Precision | <<locked>> | 86% | 40,596 psi | 86% | 2464 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 41,669 psi | 88% | 2546 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 41,742 psi | 89% | 2493 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 41,611 psi | 88% | 2405 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 41,133 psi | 87% | 2408 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 40,944 psi | 87% | 2408 fps | 99.9% |
| Somchem S341 | <<locked>> | 82% | 40,219 psi | 85% | 2457 fps | 96.7% |
| Somchem S355 | <<locked>> | 90% | 41,263 psi | 88% | 2500 fps | 97.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,495 psi | 86% | 2582 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 41,727 psi | 89% | 2405 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 41,597 psi | 88% | 2470 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 40,161 psi | 85% | 2434 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 92% | 41,989 psi | 89% | 2487 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 82% | 42,641 psi | 90% | 2484 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 86% | 41,162 psi | 87% | 2467 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 40,393 psi | 86% | 2467 fps | 97.3% |
| Winchester 748 | <<locked>> | 82% | 41,655 psi | 88% | 2523 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 84% | 40,944 psi | 87% | 2497 fps | 97.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 33,968 psi | 72% | 2336 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 32,155 psi | 68% | 2316 fps | 98.5% |
| Accurate 4350 | <<locked>> | 96% | 39,494 psi | 84% | 2526 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 38,029 psi | 81% | 2421 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 39,146 psi | 83% | 2428 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 80% | 38,972 psi | 83% | 2444 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 39,073 psi | 83% | 2533 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 33,518 psi | 71% | 2346 fps | 95.8% |
| Alliant Reloder-15 | <<locked>> | 82% | 36,361 psi | 77% | 2405 fps | 95% |
| Alliant Reloder-17 | 70.3 gr | 88% | 35,346 psi | 75% | 2457 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 39,479 psi | 84% | 2467 fps | 95.3% |
| Bofors RP3 | <<locked>> | 82% | 32,808 psi | 70% | 2343 fps | 95.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,116 psi | 81% | 2451 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 80% | 38,319 psi | 81% | 2434 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 34,693 psi | 74% | 2388 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,214 psi | 73% | 2392 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,686 psi | 54% | 1440 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,898 psi | 78% | 2388 fps | 96.4% |
| IMR 3031 | <<locked>> | 80% | 37,289 psi | 79% | 2444 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,201 psi | 77% | 2359 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 34,766 psi | 74% | 2382 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 36,390 psi | 77% | 2405 fps | 98.6% |
| Lovex S060 | <<locked>> | 80% | 38,914 psi | 83% | 2375 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 33,736 psi | 72% | 2320 fps | 96.4% |
| Norma 201 | <<locked>> | 80% | 37,347 psi | 79% | 2385 fps | 97.4% |
| Norma 202 | <<locked>> | 80% | 37,333 psi | 79% | 2398 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 35,694 psi | 76% | 2395 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 84% | 37,463 psi | 79% | 2451 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,986 psi | 83% | 2451 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,904 psi | 55% | 1476 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 37,463 psi | 79% | 2490 fps | 95.3% |
| ReloadSwiss RS 60 | 63.9 gr | 80% | 29,066 psi | 62% | 2297 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 35,520 psi | 75% | 2336 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 84% | 32,996 psi | 70% | 2339 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,390 psi | 77% | 2405 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 33,736 psi | 72% | 2320 fps | 96.4% |
| SNPE Vectan SP 11 | 67.6 gr | 86% | 36,564 psi | 78% | 2438 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,608 psi | 78% | 2392 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,015 psi | 83% | 2356 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,024 psi | 68% | 2228 fps | 98.9% |
| Somchem S335 | <<locked>> | 80% | 38,522 psi | 82% | 2362 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 37,666 psi | 80% | 2405 fps | 96% |
| Somchem S355 | <<locked>> | 84% | 34,156 psi | 72% | 2352 fps | 95.5% |
| Somchem S365 | <<locked>> | 92% | 31,589 psi | 67% | 2372 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 39,131 psi | 83% | 2362 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,389 psi | 73% | 2336 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,375 psi | 75% | 2339 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 82% | 30,443 psi | 65% | 2244 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 40,001 psi | 85% | 2434 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 34,011 psi | 72% | 2326 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 35,549 psi | 75% | 2369 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 38,914 psi | 83% | 2474 fps | 98.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,665 psi | 76% | 2388 fps | 96.1% |
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 80 powders for .375 Fl. Mag. N.E. loaded with the .375 | 250gr | Speer TBBC. ReloadSwiss RS 62 delivers the highest muzzle velocity at 2,598 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,598 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 80 of the 80 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Hodgdon Hybrid 100V, Hodgdon TrailBoss 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, Alliant Reloder-17, SNPE Vectan SP 11 rank at the top here: for .375 Fl. Mag. N.E. with the .375 | 250gr | Speer TBBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Bofors RP7 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.