Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 300gr | Alaska Bullet Works Kodiak PP SPBC bullet and 41 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 4064 | <<locked>> | 82% | 40,335 psi | 86% | 2260 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 41,437 psi | 88% | 2349 fps | 98% |
| ADI AR 2208 | <<locked>> | 84% | 41,959 psi | 89% | 2274 fps | 98.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,235 psi | 90% | 2395 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 41,495 psi | 88% | 2297 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,018 psi | 89% | 2306 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,191 psi | 87% | 2359 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 88% | 40,988 psi | 87% | 2382 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,463 psi | 79% | 2316 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,423 psi | 88% | 2451 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 41,379 psi | 88% | 2306 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 42,148 psi | 89% | 2306 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 40,364 psi | 86% | 2306 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 42,598 psi | 90% | 2349 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,389 psi | 75% | 1480 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 41,394 psi | 88% | 2257 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 42,583 psi | 90% | 2352 fps | 98.3% |
| Lovex S062 | <<locked>> | 82% | 41,379 psi | 88% | 2264 fps | 99.6% |
| Lovex S065 | <<locked>> | 88% | 40,683 psi | 86% | 2257 fps | 96.3% |
| Norma 203B | <<locked>> | 82% | 41,336 psi | 88% | 2297 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 41,553 psi | 88% | 2346 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 82% | 40,799 psi | 87% | 2310 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,868 psi | 76% | 1516 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 42,641 psi | 90% | 2290 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,031 psi | 87% | 2388 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,017 psi | 87% | 2365 fps | 97.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,249 psi | 88% | 2379 fps | 97% |
| Rottweil R 903 | <<locked>> | 86% | 41,437 psi | 88% | 2300 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,683 psi | 86% | 2257 fps | 96.3% |
| Shooters World Precision | <<locked>> | 82% | 41,379 psi | 88% | 2264 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,554 psi | 90% | 2346 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 41,495 psi | 88% | 2198 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,264 psi | 90% | 2303 fps | 99.3% |
| Somchem S365 | <<locked>> | 96% | 42,076 psi | 89% | 2395 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 40,321 psi | 86% | 2244 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 90% | 40,756 psi | 86% | 2300 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 82% | 41,742 psi | 89% | 2260 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 40,074 psi | 85% | 2303 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,683 psi | 86% | 2385 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 40,799 psi | 87% | 2283 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,402 psi | 71% | 2310 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 4064 | <<locked>> | 80% | 37,797 psi | 80% | 2218 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,779 psi | 72% | 2205 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,130 psi | 79% | 2185 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,494 psi | 84% | 2343 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,709 psi | 78% | 2208 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,436 psi | 84% | 2260 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,271 psi | 68% | 2165 fps | 95% |
| Alliant Reloder-17 | 63.3 gr | 80% | 31,546 psi | 67% | 2175 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,472 psi | 63% | 2129 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,201 psi | 77% | 2339 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 36,143 psi | 77% | 2208 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 80% | 37,130 psi | 79% | 2211 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,717 psi | 59% | 2031 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,798 psi | 84% | 2300 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 56% | 1319 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,986 psi | 83% | 2215 fps | 98.1% |
| IMR 4831 | <<locked>> | 86% | 32,866 psi | 70% | 2165 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 38,841 psi | 82% | 2218 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 38,377 psi | 81% | 2215 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 38,827 psi | 82% | 2251 fps | 98.5% |
| Norma URP | <<locked>> | 86% | 34,287 psi | 73% | 2205 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 38,145 psi | 81% | 2264 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,672 psi | 57% | 1352 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,118 psi | 85% | 2244 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,562 psi | 71% | 2234 fps | 99.4% |
| ReloadSwiss RS 62 | 68 gr | 86% | 33,576 psi | 71% | 2218 fps | 95.2% |
| ReloadSwiss RS 70 | 70.7 gr | 88% | 36,158 psi | 77% | 2270 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 34,084 psi | 72% | 2159 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,377 psi | 81% | 2215 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 38,841 psi | 82% | 2218 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,925 psi | 74% | 2201 fps | 97.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,738 psi | 78% | 2119 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 34,925 psi | 74% | 2165 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 25,309 psi | 54% | 2018 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 33,199 psi | 70% | 2113 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 33,620 psi | 71% | 2159 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 39,189 psi | 83% | 2218 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 35,201 psi | 75% | 2208 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 92% | 31,357 psi | 67% | 2192 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,414 psi | 62% | 2044 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,515 psi | 63% | 2198 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 41 powders for .375 Fl. Mag. N.E. loaded with the .375 | 300gr | Alaska Bullet Works Kodiak PP SPBC. Alliant Reloder-26 delivers the highest muzzle velocity at 2,451 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,451 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 41 of the 41 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 | Alaska Bullet Works Kodiak PP SPBC 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.