Load Specifications
Load data in caliber .375 Swiss P with .375 | 400gr | MAKER REX SUB bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 52,446 psi | 86% | 2300 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,259 psi | 89% | 2316 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,766 psi | 90% | 2441 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 90% | 51,677 psi | 85% | 2333 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 94% | 52,692 psi | 87% | 2388 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,876 psi | 77% | 2306 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,466 psi | 68% | 2280 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 51,822 psi | 85% | 2329 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 51,967 psi | 85% | 2320 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 52,736 psi | 87% | 2329 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,549 psi | 90% | 2365 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 52,489 psi | 86% | 2382 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 53,621 psi | 88% | 2346 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,576 psi | 86% | 2402 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 53,461 psi | 88% | 2428 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 54,563 psi | 90% | 2359 fps | 98.1% |
| Bofors RP15 | <<locked>> | 98% | 54,969 psi | 90% | 2415 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,486 psi | 80% | 2365 fps | 99.7% |
| Bofors RP5 | <<locked>> | 94% | 52,489 psi | 86% | 2382 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 53,534 psi | 88% | 2277 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,692 psi | 85% | 2375 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 84% | 52,533 psi | 86% | 2323 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 51,967 psi | 85% | 2287 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 52,765 psi | 87% | 2336 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 51,605 psi | 85% | 2320 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 52,214 psi | 86% | 2254 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,576 psi | 85% | 2470 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 52,533 psi | 86% | 2359 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,970 psi | 61% | 1398 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,940 psi | 90% | 2310 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 51,822 psi | 85% | 2254 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 54,752 psi | 90% | 2313 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,128 psi | 89% | 2320 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 96% | 54,201 psi | 89% | 2418 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 36,999 psi | 61% | 2205 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 52,272 psi | 86% | 2251 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 53,592 psi | 88% | 2290 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,417 psi | 88% | 2310 fps | 100% |
| Norma 204 | <<locked>> | 86% | 52,170 psi | 86% | 2316 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 36,912 psi | 61% | 2224 fps | 99.4% |
| Norma MRP | <<locked>> | 92% | 52,141 psi | 86% | 2398 fps | 100% |
| Norma URP | <<locked>> | 86% | 52,953 psi | 87% | 2303 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,578 psi | 90% | 2431 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 51,692 psi | 85% | 2316 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 52,562 psi | 86% | 2375 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 62% | 1434 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,172 psi | 89% | 2339 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 52,518 psi | 86% | 2369 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,779 psi | 85% | 2470 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,528 psi | 76% | 2382 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 82% | 54,665 psi | 90% | 2264 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 52,895 psi | 87% | 2303 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 92% | 54,041 psi | 89% | 2356 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 53,534 psi | 88% | 2277 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 52,272 psi | 86% | 2251 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 53,592 psi | 88% | 2290 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,882 psi | 90% | 2152 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,679 psi | 90% | 2254 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 53,606 psi | 88% | 2356 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 54,520 psi | 90% | 2260 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,230 psi | 89% | 2306 fps | 99.4% |
| Somchem S365 | <<locked>> | 88% | 52,997 psi | 87% | 2303 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,273 psi | 89% | 2333 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 52,243 psi | 86% | 2198 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,839 psi | 90% | 2297 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 53,911 psi | 89% | 2320 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 51,982 psi | 85% | 2329 fps | 96% |
| Vihtavuori N550 | <<locked>> | 86% | 53,853 psi | 88% | 2306 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 52,402 psi | 86% | 2326 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 52,185 psi | 86% | 2402 fps | 99.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,998 psi | 90% | 2428 fps | 99.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 48,037 psi | 79% | 2385 fps | 98.5% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 45,397 psi | 75% | 2379 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 53,969 psi | 89% | 2264 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 52,707 psi | 87% | 2326 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,346 psi | 89% | 2464 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,215 psi | 89% | 2333 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 32,605 psi | 54% | 1998 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 44,193 psi | 73% | 2188 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 35,737 psi | 59% | 2139 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 37,072 psi | 61% | 2103 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 32,953 psi | 54% | 2047 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 88% | 31,604 psi | 52% | 2024 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 86% | 26,527 psi | 44% | 1949 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,391 psi | 61% | 2106 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,743 psi | 70% | 2195 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,182 psi | 81% | 2287 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,043 psi | 61% | 2100 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 32,735 psi | 54% | 2057 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,531 psi | 52% | 2021 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,412 psi | 45% | 1962 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,171 psi | 56% | 2142 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 42,670 psi | 70% | 2175 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 30,487 psi | 50% | 2008 fps | 96.1% |
| Bofors RP30 | <<locked>> | 86% | 30,298 psi | 50% | 2037 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 32,735 psi | 54% | 2057 fps | 97.2% |
| Bofors RP7 | <<locked>> | 80% | 47,210 psi | 78% | 2192 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 30,182 psi | 50% | 1991 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 46,064 psi | 76% | 2234 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 48,805 psi | 80% | 2244 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 35,172 psi | 58% | 2054 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 34,534 psi | 57% | 2041 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,161 psi | 66% | 2100 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 82% | 28,529 psi | 47% | 2024 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 45,237 psi | 74% | 2260 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 46% | 1247 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,815 psi | 70% | 2142 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,733 psi | 80% | 2211 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 42,163 psi | 69% | 2146 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 37,101 psi | 61% | 2057 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 80% | 31,589 psi | 52% | 2031 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 94% | 30,530 psi | 50% | 2064 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 46,166 psi | 76% | 2169 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 44,425 psi | 73% | 2165 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 28,007 psi | 46% | 1900 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 42,670 psi | 70% | 2178 fps | 99.1% |
| Norma 217 | <<locked>> | 90% | 26,716 psi | 44% | 1988 fps | 95.8% |
| Norma MRP | 76.2 gr | 80% | 34,156 psi | 56% | 2113 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 43,627 psi | 72% | 2182 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 30,864 psi | 51% | 2031 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 42,409 psi | 70% | 2185 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 27,224 psi | 45% | 1936 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 47% | 1280 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,135 psi | 72% | 2211 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,337 psi | 70% | 2228 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 25,469 psi | 42% | 1946 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 34,577 psi | 57% | 2165 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 51,285 psi | 84% | 2224 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 38,537 psi | 63% | 2087 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 80% | 36,201 psi | 59% | 2087 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 80% | 47,210 psi | 78% | 2192 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,166 psi | 76% | 2169 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 44,425 psi | 73% | 2165 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,677 psi | 85% | 2116 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,020 psi | 74% | 2129 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,911 psi | 59% | 2083 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 51,198 psi | 84% | 2221 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 38,812 psi | 64% | 2077 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 40,495 psi | 66% | 2142 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,738 psi | 60% | 2073 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 80% | 49,023 psi | 80% | 2159 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,078 psi | 74% | 2172 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 31,763 psi | 52% | 1975 fps | 97.2% |
| Vihtavuori N170 | <<locked>> | 98% | 48,588 psi | 80% | 2283 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 44,309 psi | 73% | 2182 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 35,375 psi | 58% | 2080 fps | 100% |
| Vihtavuori N560 | 76.2 gr | 80% | 34,519 psi | 57% | 2106 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 31,879 psi | 52% | 2051 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 92% | 36,318 psi | 60% | 2182 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 98% | 42,351 psi | 70% | 2323 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,859 psi | 72% | 2142 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,224 psi | 76% | 2238 fps | 100% |
| Winchester StaBALL HD | 75.4 gr | 80% | 27,775 psi | 46% | 2051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 33,388 psi | 55% | 2011 fps | 97.2% |
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 77 powders for .375 Swiss P loaded with the .375 | 400gr | MAKER REX SUB. Hodgdon Retumbo delivers the highest muzzle velocity at 2,470 fps; across all powders the maximum-charge window runs from 1,398 fps to 2,470 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 400.0 gr projectile in 0.375" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for .375 Swiss P with the .375 | 400gr | MAKER REX SUB 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.