Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 300gr | Atomic 29 HP bullet and 59 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 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>> | 86% | 42,177 psi | 89% | 2241 fps | 100% |
| Accurate 4064 | <<locked>> | 88% | 42,293 psi | 90% | 2277 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 40,857 psi | 87% | 2316 fps | 97.3% |
| ADI AR 2206H | <<locked>> | 82% | 41,495 psi | 88% | 2254 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 88% | 42,656 psi | 90% | 2257 fps | 98.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 40,248 psi | 85% | 2323 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 41,785 psi | 89% | 2277 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 86% | 42,351 psi | 90% | 2287 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 96% | 41,495 psi | 88% | 2329 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 92% | 41,350 psi | 88% | 2356 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,721 psi | 69% | 2182 fps | 96.2% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 40,509 psi | 86% | 2254 fps | 97.3% |
| Bofors RP3 | <<locked>> | 88% | 41,176 psi | 87% | 2280 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 82% | 41,901 psi | 89% | 2280 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 88% | 42,641 psi | 90% | 2287 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 82% | 41,829 psi | 89% | 2264 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 40,321 psi | 86% | 2277 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 40,277 psi | 85% | 2287 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,693 psi | 74% | 1437 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 40,335 psi | 86% | 2224 fps | 98.6% |
| IMR 3031 | <<locked>> | 82% | 41,046 psi | 87% | 2260 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 41,989 psi | 89% | 2241 fps | 98.2% |
| IMR 4831 | <<locked>> | 98% | 42,003 psi | 89% | 2320 fps | 97.6% |
| IMR 4895 | <<locked>> | 84% | 40,582 psi | 86% | 2267 fps | 98.4% |
| Lovex D073.6 | <<locked>> | 82% | 40,030 psi | 85% | 2238 fps | 99.9% |
| Lovex S060 | <<locked>> | 82% | 42,221 psi | 90% | 2205 fps | 98.6% |
| Lovex S062 | <<locked>> | 86% | 41,626 psi | 88% | 2244 fps | 99.4% |
| Norma 201 | <<locked>> | 82% | 40,582 psi | 86% | 2211 fps | 99.2% |
| Norma 202 | <<locked>> | 82% | 40,799 psi | 87% | 2224 fps | 100% |
| Norma 203B | <<locked>> | 86% | 41,611 psi | 88% | 2277 fps | 98.6% |
| Norma URP | <<locked>> | 96% | 41,365 psi | 88% | 2316 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 86% | 41,321 psi | 88% | 2293 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,085 psi | 74% | 1473 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 41,365 psi | 88% | 2329 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 41,394 psi | 88% | 2365 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 40,654 psi | 86% | 2333 fps | 96.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 41,800 psi | 89% | 2349 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 84% | 40,944 psi | 87% | 2215 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 90% | 41,263 psi | 88% | 2274 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 82% | 40,030 psi | 85% | 2238 fps | 99.9% |
| Shooters World Precision | <<locked>> | 86% | 41,626 psi | 88% | 2244 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 40,030 psi | 85% | 2277 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 41,437 psi | 88% | 2238 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 40,132 psi | 85% | 2228 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 42,554 psi | 90% | 2182 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 42,235 psi | 90% | 2185 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 41,785 psi | 89% | 2182 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 41,278 psi | 88% | 2241 fps | 98.3% |
| Somchem S355 | <<locked>> | 90% | 42,264 psi | 90% | 2277 fps | 99% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,858 psi | 89% | 2365 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 84% | 40,292 psi | 85% | 2201 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 41,249 psi | 88% | 2211 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 40,480 psi | 86% | 2224 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 94% | 40,785 psi | 87% | 2274 fps | 97% |
| Vihtavuori N540 | <<locked>> | 86% | 42,264 psi | 90% | 2247 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 42,540 psi | 90% | 2320 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 34,679 psi | 74% | 2247 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 41,307 psi | 88% | 2260 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 42,119 psi | 89% | 2280 fps | 99% |
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% | 34,548 psi | 73% | 2116 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 32,692 psi | 69% | 2106 fps | 99.6% |
| Accurate 4350 | <<locked>> | 92% | 35,375 psi | 75% | 2218 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 39,059 psi | 83% | 2208 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 33,170 psi | 70% | 2080 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 35,012 psi | 74% | 2215 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,329 psi | 69% | 2096 fps | 97.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,911 psi | 74% | 2149 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 90% | 34,432 psi | 73% | 2185 fps | 95.1% |
| Alliant Reloder-17 | 59.3 gr | 82% | 29,675 psi | 63% | 2100 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 30,835 psi | 65% | 2136 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,811 psi | 80% | 2205 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 31,444 psi | 67% | 2093 fps | 96.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,044 psi | 83% | 2231 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 84% | 37,289 psi | 79% | 2192 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 39,378 psi | 84% | 2221 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 29,370 psi | 62% | 2051 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,128 psi | 75% | 2188 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,788 psi | 55% | 1283 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,942 psi | 80% | 2178 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 38,450 psi | 82% | 2218 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,766 psi | 74% | 2106 fps | 96.3% |
| IMR 4831 | <<locked>> | 92% | 34,476 psi | 73% | 2182 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 35,694 psi | 76% | 2175 fps | 97.2% |
| Lovex D073.6 | <<locked>> | 80% | 37,231 psi | 79% | 2188 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 39,813 psi | 84% | 2162 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 34,490 psi | 73% | 2113 fps | 98.1% |
| Norma 201 | <<locked>> | 80% | 38,159 psi | 81% | 2172 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 38,348 psi | 81% | 2182 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 34,287 psi | 73% | 2139 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 34,113 psi | 72% | 2175 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 33,562 psi | 71% | 2146 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,889 psi | 55% | 1309 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 36,100 psi | 77% | 2231 fps | 96.7% |
| ReloadSwiss RS 60 | 57.9 gr | 80% | 29,704 psi | 63% | 2113 fps | 97.7% |
| ReloadSwiss RS 62 | 66.5 gr | 92% | 35,650 psi | 76% | 2238 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 39,015 psi | 83% | 2293 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 36,230 psi | 77% | 2126 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 80% | 29,573 psi | 63% | 2044 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,231 psi | 79% | 2188 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 34,490 psi | 73% | 2113 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,908 psi | 66% | 2090 fps | 95.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,841 psi | 82% | 2195 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,608 psi | 80% | 2185 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,987 psi | 85% | 2139 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,822 psi | 70% | 2024 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 39,363 psi | 84% | 2142 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,493 psi | 82% | 2192 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 30,734 psi | 65% | 2057 fps | 96% |
| Somchem S365 | <<locked>> | 86% | 26,658 psi | 57% | 2034 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 35,389 psi | 75% | 2123 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,274 psi | 77% | 2129 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 29,138 psi | 62% | 2005 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 90% | 35,737 psi | 76% | 2178 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 34,766 psi | 74% | 2116 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 34,940 psi | 74% | 2182 fps | 95% |
| Vihtavuori N555 | <<locked>> | 98% | 32,445 psi | 69% | 2198 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 29,747 psi | 63% | 2024 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,767 psi | 78% | 2185 fps | 98% |
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 59 powders for .375 Fl. Mag. N.E. loaded with the .375 | 300gr | Atomic 29 HP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,365 fps; across all powders the maximum-charge window runs from 1,437 fps to 2,365 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 59 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Hodgdon TrailBoss, ReloadSwiss RS 14 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, ReloadSwiss RS 62 rank at the top here: for .375 Fl. Mag. N.E. with the .375 | 300gr | Atomic 29 HP 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.