Load Specifications
Load data in caliber .375 Hoelderlin with .375 | 270gr | Speer Boat-Tail bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 60 and ReloadSwiss RS 52.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 47,181 psi | 86% | 2411 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 48,370 psi | 88% | 2467 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 46,775 psi | 85% | 2461 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 47,601 psi | 86% | 2507 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 47,601 psi | 86% | 2507 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 49,588 psi | 90% | 2539 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 41,640 psi | 76% | 2480 fps | 96.6% |
| ADI AR 2206H | <<locked>> | 90% | 49,081 psi | 89% | 2523 fps | 99% |
| ADI AR 2208 | <<locked>> | 94% | 46,949 psi | 85% | 2474 fps | 98.1% |
| ADI Benchmark 8208 | <<locked>> | 88% | 48,515 psi | 88% | 2484 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 88% | 47,514 psi | 86% | 2474 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 49,719 psi | 90% | 2579 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 48,080 psi | 87% | 2608 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 48,834 psi | 89% | 2536 fps | 99.5% |
| Alliant Reloder-10x | <<locked>> | 82% | 47,311 psi | 86% | 2418 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 49,734 psi | 90% | 2556 fps | 98.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,815 psi | 78% | 2490 fps | 96.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 48,936 psi | 89% | 2631 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 49,371 psi | 90% | 2402 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 48,269 psi | 88% | 2530 fps | 98% |
| Bofors RP3 | <<locked>> | 96% | 48,588 psi | 88% | 2546 fps | 99.5% |
| Hodgdon Benchmark | <<locked>> | 86% | 47,950 psi | 87% | 2434 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 88% | 46,688 psi | 85% | 2510 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 86% | 48,109 psi | 87% | 2585 fps | 98.6% |
| Hodgdon H322 | <<locked>> | 86% | 48,385 psi | 88% | 2480 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 49,400 psi | 90% | 2507 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 47,355 psi | 86% | 2507 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 90% | 49,458 psi | 90% | 2536 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,841 psi | 70% | 2385 fps | 97.4% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 47,587 psi | 86% | 2556 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,272 psi | 62% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 49,588 psi | 90% | 2520 fps | 99.3% |
| IMR 3031 | <<locked>> | 94% | 49,850 psi | 90% | 2549 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 48,472 psi | 88% | 2487 fps | 98.5% |
| IMR 4198 | <<locked>> | 82% | 48,080 psi | 87% | 2382 fps | 100% |
| IMR 4895 | <<locked>> | 92% | 47,688 psi | 87% | 2536 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 88% | 48,515 psi | 88% | 2484 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 84% | 48,254 psi | 88% | 2474 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 90% | 47,398 psi | 86% | 2503 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 49,705 psi | 90% | 2464 fps | 99% |
| Lovex S062 | <<locked>> | 94% | 48,834 psi | 89% | 2503 fps | 99.7% |
| Lovex S065ᴾ | <<locked>> | 100% | 47,601 psi | 86% | 2484 fps | 96.3% |
| Norma 201 | <<locked>> | 90% | 48,022 psi | 87% | 2477 fps | 99.6% |
| Norma 202 | <<locked>> | 90% | 48,095 psi | 87% | 2487 fps | 100% |
| Norma 203B | <<locked>> | 94% | 48,820 psi | 89% | 2543 fps | 99% |
| Norma URPᴾ | <<locked>> | 100% | 42,453 psi | 77% | 2480 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 94% | 48,863 psi | 89% | 2566 fps | 98.9% |
| Ramshot TAC | <<locked>> | 88% | 48,950 psi | 89% | 2493 fps | 96.8% |
| Ramshot Wild Boar | <<locked>> | 88% | 47,747 psi | 87% | 2513 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 86% | 49,821 psi | 90% | 2487 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,650 psi | 63% | 1555 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 48,428 psi | 88% | 2477 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 48,791 psi | 89% | 2605 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 49,023 psi | 89% | 2641 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 41,814 psi | 76% | 2497 fps | 96.1% |
| Rottweil R 901 | <<locked>> | 88% | 49,298 psi | 89% | 2470 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 48,298 psi | 88% | 2474 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 98% | 48,211 psi | 87% | 2533 fps | 99.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 47,601 psi | 86% | 2484 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 90% | 47,398 psi | 86% | 2503 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 48,834 psi | 89% | 2503 fps | 99.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 48,080 psi | 87% | 2444 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 47,123 psi | 86% | 2543 fps | 98.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 47,979 psi | 87% | 2431 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 46,746 psi | 85% | 2467 fps | 96.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 47,543 psi | 86% | 2497 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 47,210 psi | 86% | 2392 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 49,472 psi | 90% | 2431 fps | 100% |
| Somchem S321 | <<locked>> | 86% | 49,284 psi | 89% | 2516 fps | 99.8% |
| Somchem S335 | <<locked>> | 90% | 49,327 psi | 90% | 2438 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 49,385 psi | 90% | 2513 fps | 98.9% |
| Somchem S355 | <<locked>> | 98% | 49,269 psi | 89% | 2536 fps | 99.3% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,608 psi | 68% | 2431 fps | 98.5% |
| Unknown powderᴾ | <<locked>> | 100% | 46,688 psi | 85% | 2536 fps | 96.8% |
| Vihtavuori N130 | <<locked>> | 84% | 47,427 psi | 86% | 2375 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 47,137 psi | 86% | 2388 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 47,094 psi | 85% | 2454 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 48,617 psi | 88% | 2470 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 47,413 psi | 86% | 2477 fps | 99.7% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 44,759 psi | 81% | 2480 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 88% | 48,907 psi | 89% | 2484 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 92% | 46,804 psi | 85% | 2464 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 43,700 psi | 79% | 2487 fps | 96.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,108 psi | 84% | 2474 fps | 98.9% |
| Winchester 748 | <<locked>> | 86% | 48,269 psi | 88% | 2536 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 48,066 psi | 87% | 2523 fps | 99.2% |
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% | 39,102 psi | 71% | 2287 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 42,395 psi | 77% | 2375 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 31,604 psi | 57% | 2205 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 36,129 psi | 66% | 2313 fps | 99% |
| Accurate 2520 | <<locked>> | 80% | 36,129 psi | 66% | 2313 fps | 99% |
| Accurate 4064 | <<locked>> | 80% | 29,921 psi | 54% | 2188 fps | 98.5% |
| Accurate 4350 | <<locked>> | 98% | 38,885 psi | 71% | 2431 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 35,984 psi | 65% | 2290 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 36,869 psi | 67% | 2290 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,913 psi | 69% | 2303 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 36,434 psi | 66% | 2310 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,598 psi | 79% | 2477 fps | 98.7% |
| Alliant Power Pro 2000-MR | 61.6 gr | 86% | 39,407 psi | 72% | 2444 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,428 psi | 53% | 2169 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,425 psi | 81% | 2375 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 36,347 psi | 66% | 2320 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 37,869 psi | 69% | 2392 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 33,098 psi | 60% | 2316 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,412 psi | 84% | 2362 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 37,086 psi | 67% | 2329 fps | 95.2% |
| Bofors RP3 | <<locked>> | 82% | 30,560 psi | 55% | 2211 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 39,987 psi | 73% | 2300 fps | 98.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,679 psi | 65% | 2313 fps | 98.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 39,175 psi | 71% | 2425 fps | 96.6% |
| Hodgdon H322 | <<locked>> | 80% | 39,972 psi | 73% | 2349 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,267 psi | 84% | 2461 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 38,754 psi | 70% | 2359 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 36,172 psi | 66% | 2300 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 32,387 psi | 59% | 2247 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 30,371 psi | 55% | 2215 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,469 psi | 46% | 1355 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 32,314 psi | 59% | 2201 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 31,995 psi | 58% | 2247 fps | 99.7% |
| IMR 4064 | <<locked>> | 86% | 36,013 psi | 65% | 2267 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 45,339 psi | 82% | 2346 fps | 100% |
| IMR 4895 | <<locked>> | 80% | 32,677 psi | 59% | 2251 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 37,913 psi | 69% | 2303 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 42,061 psi | 76% | 2379 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 33,939 psi | 62% | 2270 fps | 98.6% |
| Lovex S060 | <<locked>> | 80% | 36,927 psi | 67% | 2241 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 31,691 psi | 57% | 2188 fps | 96.3% |
| Lovex S065 | <<locked>> | 98% | 44,831 psi | 81% | 2438 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 35,230 psi | 64% | 2251 fps | 97.4% |
| Norma 202 | <<locked>> | 80% | 35,186 psi | 64% | 2267 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 33,388 psi | 61% | 2260 fps | 95.4% |
| Norma URP | <<locked>> | 96% | 37,376 psi | 68% | 2382 fps | 95% |
| Ramshot Big Game | <<locked>> | 84% | 35,128 psi | 64% | 2313 fps | 95.6% |
| Ramshot TAC | <<locked>> | 84% | 43,047 psi | 78% | 2395 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,535 psi | 66% | 2313 fps | 96.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,075 psi | 75% | 2343 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,744 psi | 47% | 1388 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,496 psi | 77% | 2382 fps | 99.6% |
| ReloadSwiss RS 52 | 56.9 gr | 82% | 34,954 psi | 63% | 2349 fps | 95.2% |
| ReloadSwiss RS 60 | 56.4 gr | 80% | 27,398 psi | 50% | 2169 fps | 95.1% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 39,131 psi | 71% | 2444 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 38,928 psi | 71% | 2300 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 33,504 psi | 61% | 2208 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 84% | 30,603 psi | 56% | 2205 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 44,831 psi | 81% | 2438 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,939 psi | 62% | 2270 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 31,691 psi | 57% | 2188 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,020 psi | 82% | 2395 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 34,360 psi | 62% | 2303 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,034 psi | 82% | 2388 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 40,785 psi | 74% | 2365 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,418 psi | 62% | 2257 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,912 psi | 67% | 2224 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,153 psi | 55% | 2103 fps | 98.9% |
| Somchem S321 | <<locked>> | 80% | 40,422 psi | 73% | 2372 fps | 98.8% |
| Somchem S335 | <<locked>> | 80% | 36,463 psi | 66% | 2231 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 35,317 psi | 64% | 2270 fps | 95.8% |
| Somchem S355 | <<locked>> | 84% | 31,908 psi | 58% | 2218 fps | 95.4% |
| Somchem S365 | <<locked>> | 92% | 29,472 psi | 53% | 2238 fps | 95.5% |
| Unknown powder | <<locked>> | 96% | 41,118 psi | 75% | 2441 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 41,959 psi | 76% | 2293 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,941 psi | 67% | 2228 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,140 psi | 58% | 2205 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,228 psi | 60% | 2211 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 28,413 psi | 52% | 2119 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 96% | 39,421 psi | 72% | 2385 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 37,768 psi | 69% | 2300 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 31,807 psi | 58% | 2195 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 96% | 38,348 psi | 70% | 2388 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 33,417 psi | 61% | 2231 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 39,320 psi | 71% | 2388 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,785 psi | 76% | 2421 fps | 98.3% |
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 105 powders for .375 Hoelderlin loaded with the .375 | 270gr | Speer Boat-Tail. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,641 fps; across all powders the maximum-charge window runs from 1,516 fps to 2,641 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 270.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, ReloadSwiss RS 52 rank at the top here: for .375 Hoelderlin with the .375 | 270gr | Speer Boat-Tail they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Bofors RP7 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.