Load Specifications
Load data in caliber .375 R Hoelderlin with .375 | 285gr | Speer Grand Slam bullet and 76 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 Alliant Power Pro 2000-MR.
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 2015 | <<locked>> | 84% | 46,992 psi | 90% | 2343 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 46,920 psi | 90% | 2398 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 46,035 psi | 88% | 2408 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 47,007 psi | 90% | 2434 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,150 psi | 86% | 2480 fps | 98.1% |
| ADI AR 2206H | <<locked>> | 86% | 45,847 psi | 88% | 2415 fps | 99% |
| ADI AR 2208 | <<locked>> | 92% | 46,847 psi | 90% | 2415 fps | 98.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 45,455 psi | 87% | 2379 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 84% | 44,628 psi | 85% | 2365 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 44,585 psi | 85% | 2493 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 45,905 psi | 88% | 2431 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 90% | 46,702 psi | 89% | 2448 fps | 98.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,353 psi | 87% | 2487 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 96% | 45,803 psi | 88% | 2523 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 44,947 psi | 86% | 2421 fps | 98.1% |
| Bofors RP3 | <<locked>> | 92% | 45,629 psi | 87% | 2441 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 44,860 psi | 86% | 2326 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 86% | 46,688 psi | 89% | 2448 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 82% | 44,817 psi | 86% | 2470 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 92% | 47,152 psi | 90% | 2448 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 86% | 46,180 psi | 88% | 2425 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,568 psi | 80% | 2382 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 44,556 psi | 85% | 2448 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,766 psi | 67% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 44,715 psi | 86% | 2385 fps | 99.2% |
| IMR 3031 | <<locked>> | 86% | 45,411 psi | 87% | 2418 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 46,427 psi | 89% | 2398 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,178 psi | 83% | 2431 fps | 97.7% |
| IMR 4895 | <<locked>> | 88% | 44,846 psi | 86% | 2431 fps | 99% |
| IMR 8208 XBR | <<locked>> | 84% | 45,455 psi | 87% | 2379 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 86% | 44,382 psi | 85% | 2395 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 46,412 psi | 89% | 2356 fps | 99.1% |
| Lovex S062 | <<locked>> | 90% | 45,847 psi | 88% | 2398 fps | 99.7% |
| Lovex S065 | <<locked>> | 96% | 44,846 psi | 86% | 2385 fps | 96.5% |
| Norma 201 | <<locked>> | 86% | 45,034 psi | 86% | 2372 fps | 99.6% |
| Norma 202 | <<locked>> | 86% | 45,165 psi | 87% | 2382 fps | 100% |
| Norma 203B | <<locked>> | 90% | 45,919 psi | 88% | 2438 fps | 99.1% |
| Norma URPᴾ | <<locked>> | 100% | 45,252 psi | 87% | 2474 fps | 98% |
| Ramshot Big Game | <<locked>> | 90% | 45,658 psi | 87% | 2454 fps | 98.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 44,730 psi | 86% | 2464 fps | 95.9% |
| Ramshot TAC | <<locked>> | 84% | 45,513 psi | 87% | 2382 fps | 96.8% |
| Ramshot Wild Boar | <<locked>> | 84% | 44,440 psi | 85% | 2402 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 46,282 psi | 89% | 2379 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,983 psi | 67% | 1522 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 45,905 psi | 88% | 2500 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 45,658 psi | 87% | 2530 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,063 psi | 86% | 2500 fps | 97.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,195 psi | 88% | 2513 fps | 97.2% |
| Rottweil R 901 | <<locked>> | 84% | 46,267 psi | 89% | 2365 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 45,469 psi | 87% | 2372 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 94% | 45,527 psi | 87% | 2431 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 44,846 psi | 86% | 2385 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 44,382 psi | 85% | 2395 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 45,847 psi | 88% | 2398 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 47,195 psi | 90% | 2487 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 46,340 psi | 89% | 2405 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 44,440 psi | 85% | 2392 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 47,036 psi | 90% | 2329 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 46,325 psi | 89% | 2329 fps | 100% |
| Somchem S321 | <<locked>> | 82% | 45,847 psi | 88% | 2405 fps | 99.8% |
| Somchem S335 | <<locked>> | 86% | 46,224 psi | 89% | 2333 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 45,919 psi | 88% | 2405 fps | 99% |
| Somchem S355 | <<locked>> | 94% | 46,485 psi | 89% | 2434 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,364 psi | 77% | 2431 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 82% | 47,079 psi | 90% | 2306 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 47,065 psi | 90% | 2323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 47,108 psi | 90% | 2388 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 45,542 psi | 87% | 2365 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 44,614 psi | 85% | 2375 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 98% | 44,817 psi | 86% | 2428 fps | 97.7% |
| Vihtavuori N530 | <<locked>> | 84% | 45,513 psi | 87% | 2375 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 90% | 46,644 psi | 89% | 2402 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,862 psi | 90% | 2480 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 45,788 psi | 88% | 2418 fps | 99.4% |
| Winchester 748 | <<locked>> | 84% | 44,512 psi | 85% | 2415 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 46,644 psi | 89% | 2441 fps | 99.5% |
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 2015 | <<locked>> | 80% | 41,553 psi | 80% | 2264 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,069 psi | 65% | 2192 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,118 psi | 77% | 2316 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 32,213 psi | 62% | 2178 fps | 99.4% |
| Accurate 4350 | <<locked>> | 92% | 34,200 psi | 66% | 2280 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 38,145 psi | 73% | 2277 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 80% | 32,576 psi | 62% | 2146 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,161 psi | 77% | 2290 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 39,131 psi | 75% | 2287 fps | 100% |
| Alliant Power Pro 2000-MR | 58.1 gr | 80% | 34,214 psi | 66% | 2280 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,502 psi | 60% | 2162 fps | 96.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,098 psi | 65% | 2218 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 35,708 psi | 68% | 2297 fps | 95.4% |
| Alliant Reloder-17 | 60.1 gr | 84% | 31,053 psi | 59% | 2218 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,840 psi | 71% | 2274 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 30,647 psi | 59% | 2159 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,105 psi | 81% | 2283 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,029 psi | 73% | 2303 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 41,814 psi | 80% | 2418 fps | 98% |
| Hodgdon H380 | <<locked>> | 84% | 36,303 psi | 70% | 2257 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 38,435 psi | 74% | 2290 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 30,589 psi | 59% | 2159 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,272 psi | 66% | 2254 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,817 psi | 49% | 1325 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,985 psi | 71% | 2247 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 37,231 psi | 71% | 2287 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,098 psi | 65% | 2175 fps | 95.9% |
| IMR 4831 | <<locked>> | 94% | 35,752 psi | 68% | 2293 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 34,867 psi | 67% | 2244 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 80% | 40,161 psi | 77% | 2290 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 36,347 psi | 70% | 2257 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 38,943 psi | 75% | 2228 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 33,765 psi | 65% | 2182 fps | 97.7% |
| Lovex S065 | <<locked>> | 92% | 39,900 psi | 76% | 2300 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 37,420 psi | 72% | 2241 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 37,434 psi | 72% | 2251 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 33,489 psi | 64% | 2208 fps | 96.3% |
| Norma URP | <<locked>> | 92% | 35,375 psi | 68% | 2290 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 32,808 psi | 63% | 2211 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 98% | 42,018 psi | 80% | 2415 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 39,856 psi | 76% | 2283 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,972 psi | 75% | 2303 fps | 97.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,323 psi | 83% | 2329 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,947 psi | 50% | 1358 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 34,896 psi | 67% | 2293 fps | 96.1% |
| ReloadSwiss RS 60 | 57.2 gr | 80% | 29,051 psi | 56% | 2175 fps | 97.2% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 36,941 psi | 71% | 2349 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 40,495 psi | 78% | 2408 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 41,089 psi | 79% | 2280 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 35,578 psi | 68% | 2195 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 80% | 28,950 psi | 55% | 2113 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 39,900 psi | 76% | 2300 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,347 psi | 70% | 2257 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 33,765 psi | 65% | 2182 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,097 psi | 61% | 2201 fps | 95.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 37,768 psi | 72% | 2254 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,521 psi | 70% | 2247 fps | 97.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,088 psi | 75% | 2208 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,053 psi | 61% | 2090 fps | 99.6% |
| Somchem S321 | <<locked>> | 80% | 42,815 psi | 82% | 2356 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 38,566 psi | 74% | 2211 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 37,536 psi | 72% | 2260 fps | 97.3% |
| Somchem S355 | <<locked>> | 80% | 30,139 psi | 58% | 2123 fps | 95.6% |
| Somchem S365 | <<locked>> | 88% | 27,847 psi | 53% | 2146 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 44,295 psi | 85% | 2267 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,175 psi | 75% | 2205 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,461 psi | 66% | 2192 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,389 psi | 68% | 2195 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 28,529 psi | 55% | 2070 fps | 96.5% |
| Vihtavuori N160 | <<locked>> | 92% | 37,043 psi | 71% | 2287 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 39,842 psi | 76% | 2280 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 33,852 psi | 65% | 2185 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 36,187 psi | 69% | 2293 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,125 psi | 60% | 2136 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 38,812 psi | 74% | 2320 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,665 psi | 68% | 2251 fps | 97.6% |
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 97 powders for .375 R Hoelderlin loaded with the .375 | 285gr | Speer Grand Slam. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,530 fps; across all powders the maximum-charge window runs from 1,486 fps to 2,530 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (360 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 285.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, Alliant Reloder-16 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, Alliant Power Pro 2000-MR rank at the top here: for .375 R Hoelderlin with the .375 | 285gr | Speer Grand Slam they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, Alliant Reloder-26 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.