Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 300gr | Woodleigh FMJ bullet and 48 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-17 and ReloadSwiss RS 62.
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>> | 82% | 42,540 psi | 90% | 2260 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 40,205 psi | 85% | 2257 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 41,307 psi | 88% | 2346 fps | 98% |
| ADI AR 2208 | <<locked>> | 84% | 41,858 psi | 89% | 2281 fps | 98.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,134 psi | 89% | 2401 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 41,394 psi | 88% | 2300 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 41,901 psi | 89% | 2314 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,089 psi | 87% | 2363 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 88% | 40,886 psi | 87% | 2387 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,145 psi | 81% | 2324 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,235 psi | 90% | 2455 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 41,075 psi | 87% | 2306 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 42,061 psi | 89% | 2311 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 40,277 psi | 85% | 2311 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 42,656 psi | 90% | 2349 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 76% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 41,466 psi | 88% | 2270 fps | 99.2% |
| IMR 3031 | <<locked>> | 82% | 42,424 psi | 90% | 2308 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 41,089 psi | 87% | 2251 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 40,321 psi | 86% | 2323 fps | 97.9% |
| Lovex S062 | <<locked>> | 82% | 41,263 psi | 88% | 2268 fps | 99.6% |
| Lovex S065 | <<locked>> | 88% | 40,553 psi | 86% | 2262 fps | 96.4% |
| Norma 203B | <<locked>> | 82% | 41,220 psi | 87% | 2304 fps | 99% |
| Norma URP | <<locked>> | 92% | 41,292 psi | 88% | 2351 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 82% | 40,698 psi | 86% | 2316 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 40,393 psi | 86% | 2339 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,419 psi | 77% | 1517 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 42,569 psi | 90% | 2297 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 40,756 psi | 86% | 2391 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,915 psi | 87% | 2372 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,176 psi | 87% | 2384 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 86% | 41,307 psi | 88% | 2305 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,553 psi | 86% | 2262 fps | 96.4% |
| Shooters World Precision | <<locked>> | 82% | 41,263 psi | 88% | 2268 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,453 psi | 90% | 2353 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 41,379 psi | 88% | 2201 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,105 psi | 89% | 2307 fps | 99.4% |
| Somchem S365 | <<locked>> | 96% | 41,989 psi | 89% | 2403 fps | 100% |
| Unknown powder | <<locked>> | 90% | 42,293 psi | 90% | 2356 fps | 97.5% |
| Vihtavuori N135 | <<locked>> | 82% | 42,569 psi | 90% | 2254 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 42,583 psi | 90% | 2264 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 40,466 psi | 86% | 2257 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 90% | 42,511 psi | 90% | 2334 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 82% | 42,206 psi | 90% | 2284 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 40,118 psi | 85% | 2325 fps | 97.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,640 psi | 86% | 2387 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 40,596 psi | 86% | 2288 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,417 psi | 71% | 2314 fps | 98.2% |
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% | 39,827 psi | 84% | 2218 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,666 psi | 80% | 2211 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,692 psi | 71% | 2201 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,014 psi | 79% | 2191 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,392 psi | 84% | 2348 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,564 psi | 78% | 2212 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,131 psi | 83% | 2263 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,184 psi | 68% | 2170 fps | 95.1% |
| Alliant Reloder-17 | 63.1 gr | 80% | 31,473 psi | 67% | 2182 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,385 psi | 62% | 2134 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,027 psi | 76% | 2345 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 36,027 psi | 76% | 2213 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 80% | 36,999 psi | 78% | 2217 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,630 psi | 59% | 2037 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,536 psi | 80% | 2257 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 56% | 1322 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,073 psi | 83% | 2224 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 39,813 psi | 84% | 2265 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,289 psi | 77% | 2162 fps | 97.4% |
| IMR 4831 | <<locked>> | 88% | 31,488 psi | 67% | 2145 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 38,725 psi | 82% | 2223 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 38,290 psi | 81% | 2220 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 38,522 psi | 82% | 2254 fps | 98.5% |
| Norma URP | <<locked>> | 84% | 32,068 psi | 68% | 2163 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,058 psi | 81% | 2268 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 37,985 psi | 81% | 2292 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,774 psi | 57% | 1355 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,856 psi | 85% | 2248 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,489 psi | 71% | 2240 fps | 99.5% |
| ReloadSwiss RS 62 | 67.8 gr | 86% | 33,489 psi | 71% | 2224 fps | 95.3% |
| ReloadSwiss RS 70 | 70.5 gr | 88% | 36,100 psi | 77% | 2277 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 33,968 psi | 72% | 2166 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,290 psi | 81% | 2220 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 38,725 psi | 82% | 2223 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,824 psi | 74% | 2208 fps | 97.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,622 psi | 78% | 2123 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 34,795 psi | 74% | 2169 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 25,237 psi | 54% | 2022 fps | 95.4% |
| Unknown powder | <<locked>> | 84% | 34,925 psi | 74% | 2214 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 40,030 psi | 85% | 2215 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,103 psi | 85% | 2224 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,718 psi | 63% | 2044 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 82% | 32,634 psi | 69% | 2143 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 39,639 psi | 84% | 2240 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,011 psi | 70% | 2182 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 92% | 31,299 psi | 66% | 2200 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,327 psi | 62% | 2050 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,327 psi | 62% | 2201 fps | 96% |
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 48 powders for .375 Fl. Mag. N.E. loaded with the .375 | 300gr | Woodleigh FMJ. Alliant Reloder-26 delivers the highest muzzle velocity at 2,455 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,455 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 48 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 71–90 %, 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. Alliant Reloder-23, Alliant Reloder-26, 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 70, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for .375 Fl. Mag. N.E. with the .375 | 300gr | Woodleigh FMJ 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.