Load Specifications
Bullet Manufacturer:A-Square
Bullet Weight:300 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Hoelderlin load data
Case Length (l3):2.657"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:88 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:25.6"
Max. allowed Pressure:55,114 psi
Recommended Twist Rate:1:6.0
Load data in caliber .375 Hoelderlin with .375 | 300gr | A-Square MONO RN bullet and 90 powders. The key underlying parameters are shown in the table above.
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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 82% | 47,108 psi | 85% | 2290 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 47,848 psi | 87% | 2349 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 49,603 psi | 90% | 2405 fps | 100% |
| Accurate 4064 | <<locked>> | 90% | 47,688 psi | 87% | 2388 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,487 psi | 90% | 2490 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 86% | 49,052 psi | 89% | 2415 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 90% | 46,934 psi | 85% | 2369 fps | 99.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 48,385 psi | 88% | 2372 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 48,283 psi | 88% | 2356 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 47,863 psi | 87% | 2507 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 49,240 psi | 89% | 2431 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 47,036 psi | 85% | 2405 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,718 psi | 88% | 2497 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 49,327 psi | 90% | 2533 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,519 psi | 63% | 2267 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 37,724 psi | 68% | 2388 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 48,356 psi | 88% | 2425 fps | 99.2% |
| Bofors RP3 | <<locked>> | 92% | 49,414 psi | 90% | 2444 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 47,340 psi | 86% | 2369 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 47,384 psi | 86% | 2316 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 46,789 psi | 85% | 2395 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 48,283 psi | 88% | 2474 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 90% | 47,616 psi | 86% | 2408 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 98% | 49,530 psi | 90% | 2490 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 49,501 psi | 90% | 2425 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,759 psi | 81% | 2388 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 47,906 psi | 87% | 2448 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,114 psi | 64% | 1463 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 47,601 psi | 86% | 2382 fps | 99.8% |
| IMR 3031 | <<locked>> | 86% | 48,994 psi | 89% | 2408 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 49,356 psi | 90% | 2395 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 88% | 49,850 psi | 90% | 2375 fps | 97% |
| IMR 4350 | <<locked>> | 98% | 46,978 psi | 85% | 2385 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 94% | 49,182 psi | 89% | 2398 fps | 96.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,036 psi | 85% | 2441 fps | 99% |
| IMR 4895 | <<locked>> | 88% | 48,167 psi | 87% | 2431 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 84% | 48,385 psi | 88% | 2372 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 47,921 psi | 87% | 2392 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 49,371 psi | 90% | 2352 fps | 99.7% |
| Lovex S062 | <<locked>> | 90% | 49,153 psi | 89% | 2398 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 48,095 psi | 87% | 2392 fps | 98% |
| Lovex S070 | <<locked>> | 98% | 48,472 psi | 88% | 2418 fps | 97% |
| Norma 201 | <<locked>> | 86% | 48,022 psi | 87% | 2369 fps | 100% |
| Norma 202 | <<locked>> | 86% | 48,269 psi | 88% | 2372 fps | 100% |
| Norma 203B | <<locked>> | 90% | 49,255 psi | 89% | 2438 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 49,023 psi | 89% | 2484 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 90% | 49,197 psi | 89% | 2457 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,283 psi | 88% | 2480 fps | 97.7% |
| Ramshot TAC | <<locked>> | 84% | 48,414 psi | 88% | 2385 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 47,630 psi | 86% | 2402 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 82% | 49,211 psi | 89% | 2375 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,389 psi | 64% | 1499 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 48,037 psi | 87% | 2388 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 49,676 psi | 90% | 2503 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 49,211 psi | 89% | 2533 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,907 psi | 89% | 2510 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 46,659 psi | 85% | 2484 fps | 98.2% |
| Rottweil R 901 | <<locked>> | 84% | 49,371 psi | 90% | 2356 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 48,457 psi | 88% | 2365 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 49,313 psi | 89% | 2434 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 94% | 47,340 psi | 86% | 2369 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 96% | 48,095 psi | 87% | 2392 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 86% | 47,921 psi | 87% | 2392 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 49,153 psi | 89% | 2398 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 48,472 psi | 88% | 2418 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 47,688 psi | 87% | 2444 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 49,763 psi | 90% | 2408 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 47,543 psi | 86% | 2388 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 49,821 psi | 90% | 2316 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 49,516 psi | 90% | 2320 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 48,037 psi | 87% | 2346 fps | 96.6% |
| Somchem S321 | <<locked>> | 82% | 49,081 psi | 89% | 2402 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 49,153 psi | 89% | 2320 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 49,385 psi | 90% | 2405 fps | 99.7% |
| Somchem S355 | <<locked>> | 92% | 47,036 psi | 85% | 2392 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,743 psi | 79% | 2441 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 47,050 psi | 85% | 2270 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 47,601 psi | 86% | 2339 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 48,631 psi | 88% | 2352 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 48,095 psi | 87% | 2375 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 48,472 psi | 88% | 2434 fps | 99% |
| Vihtavuori N530 | <<locked>> | 84% | 48,501 psi | 88% | 2369 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 46,818 psi | 85% | 2352 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 47,543 psi | 86% | 2441 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,666 psi | 67% | 2329 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 49,095 psi | 89% | 2421 fps | 99.9% |
| Winchester 748 | <<locked>> | 84% | 47,747 psi | 87% | 2411 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 49,792 psi | 90% | 2493 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,705 psi | 56% | 2247 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 86% | 46,934 psi | 85% | 2395 fps | 99.8% |
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 44,396 psi | 81% | 2254 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,898 psi | 67% | 2188 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,250 psi | 78% | 2313 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 34,882 psi | 63% | 2182 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 32,779 psi | 59% | 2205 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 40,683 psi | 74% | 2277 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 34,592 psi | 63% | 2149 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,743 psi | 78% | 2287 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 42,322 psi | 77% | 2277 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 36,593 psi | 66% | 2293 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,968 psi | 62% | 2169 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,550 psi | 66% | 2221 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,924 psi | 62% | 2218 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,211 psi | 53% | 2133 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,906 psi | 52% | 2129 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 35,273 psi | 64% | 2333 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,624 psi | 72% | 2280 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 33,257 psi | 60% | 2169 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 44,498 psi | 81% | 2323 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,585 psi | 81% | 2277 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,901 psi | 74% | 2303 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,904 psi | 81% | 2421 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 80% | 34,301 psi | 62% | 2172 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 92% | 40,828 psi | 74% | 2346 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 41,017 psi | 74% | 2287 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,037 psi | 53% | 2080 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,840 psi | 67% | 2260 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,150 psi | 47% | 1306 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,436 psi | 72% | 2247 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 40,248 psi | 73% | 2283 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,274 psi | 66% | 2175 fps | 97.4% |
| IMR 4166 Enduron | <<locked>> | 84% | 44,121 psi | 80% | 2287 fps | 95.7% |
| IMR 4350 | <<locked>> | 96% | 44,150 psi | 80% | 2343 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 43,540 psi | 79% | 2306 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 32,039 psi | 58% | 2169 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 37,391 psi | 68% | 2247 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 42,743 psi | 78% | 2287 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 39,262 psi | 71% | 2260 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,249 psi | 75% | 2224 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 36,187 psi | 66% | 2185 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 37,898 psi | 69% | 2218 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 40,408 psi | 73% | 2283 fps | 95% |
| Norma 201 | <<locked>> | 80% | 39,943 psi | 72% | 2238 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 40,045 psi | 73% | 2247 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,926 psi | 65% | 2211 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 33,591 psi | 61% | 2208 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 35,186 psi | 64% | 2221 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 39,827 psi | 72% | 2336 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 42,540 psi | 77% | 2290 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,713 psi | 76% | 2306 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,166 psi | 84% | 2329 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,310 psi | 48% | 1335 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 39,755 psi | 72% | 2251 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,753 psi | 69% | 2303 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,111 psi | 56% | 2192 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 32,779 psi | 59% | 2218 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 38,189 psi | 69% | 2326 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 43,830 psi | 80% | 2274 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,043 psi | 69% | 2198 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 31,357 psi | 57% | 2123 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 44,498 psi | 81% | 2323 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 37,898 psi | 69% | 2218 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,262 psi | 71% | 2260 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,187 psi | 66% | 2185 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 40,408 psi | 73% | 2283 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,329 psi | 59% | 2162 fps | 96.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,654 psi | 74% | 2264 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,131 psi | 71% | 2251 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,379 psi | 75% | 2198 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,171 psi | 62% | 2087 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 42,134 psi | 76% | 2257 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 45,934 psi | 83% | 2356 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,017 psi | 74% | 2201 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,364 psi | 73% | 2264 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 32,416 psi | 59% | 2129 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 24,932 psi | 45% | 2024 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 41,582 psi | 75% | 2192 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,057 psi | 67% | 2182 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,898 psi | 69% | 2192 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,719 psi | 56% | 2077 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 33,054 psi | 60% | 2162 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 42,670 psi | 77% | 2280 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 36,361 psi | 66% | 2185 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 34,374 psi | 62% | 2211 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 30,414 psi | 55% | 2192 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,312 psi | 53% | 2057 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 41,800 psi | 76% | 2320 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 40,828 psi | 74% | 2346 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,819 psi | 52% | 2192 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,319 psi | 70% | 2254 fps | 98.8% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 90 powders for .375 Hoelderlin loaded with the .375 | 300gr | A-Square MONO RN. Alliant Reloder-17 delivers the highest muzzle velocity at 2,533 fps; across all powders the maximum-charge window runs from 1,463 fps to 2,533 fps. Accurate 4350 gives the best case fill at 100 %, and 90 of the 90 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (380 MPa), the top charges use 56–90 %, 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. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.