Load Specifications
Load data in caliber .375 Hoelderlin with .375 | 305gr | Hammer Stone Hammer bullet and 93 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 Alliant Reloder-17.
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>> | 84% | 47,297 psi | 86% | 2244 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 48,312 psi | 88% | 2300 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 47,181 psi | 86% | 2297 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 47,645 psi | 86% | 2339 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 47,645 psi | 86% | 2339 fps | 100% |
| Accurate 4064 | <<locked>> | 92% | 47,195 psi | 86% | 2336 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,455 psi | 82% | 2382 fps | 98.5% |
| ADI AR 2206H | <<locked>> | 88% | 49,052 psi | 89% | 2359 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 92% | 47,152 psi | 86% | 2316 fps | 99% |
| ADI Benchmark 8208 | <<locked>> | 86% | 48,472 psi | 88% | 2323 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 86% | 47,993 psi | 87% | 2303 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 49,632 psi | 90% | 2405 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 47,935 psi | 87% | 2448 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 49,081 psi | 89% | 2375 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 90% | 46,847 psi | 85% | 2349 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,556 psi | 83% | 2388 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 98% | 49,052 psi | 89% | 2470 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,169 psi | 58% | 2162 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 48,211 psi | 87% | 2369 fps | 98.9% |
| Bofors RP3 | <<locked>> | 94% | 49,124 psi | 89% | 2388 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 47,776 psi | 87% | 2270 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 46,920 psi | 85% | 2349 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 48,138 psi | 87% | 2421 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 84% | 48,341 psi | 88% | 2310 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 47,384 psi | 86% | 2349 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 96% | 47,529 psi | 86% | 2405 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 88% | 49,429 psi | 90% | 2369 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,756 psi | 76% | 2290 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 47,718 psi | 87% | 2395 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,780 psi | 63% | 1414 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 49,763 psi | 90% | 2359 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 47,181 psi | 86% | 2339 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 48,631 psi | 88% | 2329 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 94% | 48,820 psi | 89% | 2303 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 49,139 psi | 89% | 2339 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 38,682 psi | 70% | 2257 fps | 97.1% |
| IMR 4895 | <<locked>> | 90% | 47,979 psi | 87% | 2375 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 86% | 48,472 psi | 88% | 2323 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 82% | 48,138 psi | 87% | 2310 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 47,645 psi | 86% | 2339 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 49,647 psi | 90% | 2303 fps | 99.6% |
| Lovex S062 | <<locked>> | 92% | 49,008 psi | 89% | 2343 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 47,921 psi | 87% | 2333 fps | 97.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,298 psi | 88% | 2359 fps | 96.5% |
| Norma 201 | <<locked>> | 88% | 48,066 psi | 87% | 2316 fps | 99.9% |
| Norma 202 | <<locked>> | 88% | 48,312 psi | 88% | 2323 fps | 100% |
| Norma 203B | <<locked>> | 92% | 49,052 psi | 89% | 2382 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 45,629 psi | 83% | 2379 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 92% | 48,994 psi | 89% | 2402 fps | 99.5% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 44,991 psi | 82% | 2369 fps | 96.5% |
| Ramshot TAC | <<locked>> | 86% | 48,704 psi | 88% | 2333 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 47,645 psi | 86% | 2349 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 84% | 49,501 psi | 90% | 2323 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,056 psi | 64% | 1450 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 48,225 psi | 88% | 2310 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 48,080 psi | 87% | 2336 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 49,255 psi | 89% | 2444 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 48,979 psi | 89% | 2474 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,281 psi | 82% | 2402 fps | 98.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,499 psi | 84% | 2418 fps | 97.7% |
| Rottweil R 901 | <<locked>> | 86% | 49,255 psi | 89% | 2303 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 48,414 psi | 88% | 2313 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 96% | 48,776 psi | 89% | 2375 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 47,921 psi | 87% | 2333 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 47,645 psi | 86% | 2339 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 49,008 psi | 89% | 2343 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,298 psi | 88% | 2359 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 47,442 psi | 86% | 2388 fps | 99.5% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 46,630 psi | 85% | 2310 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 47,500 psi | 86% | 2336 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 47,137 psi | 86% | 2231 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 49,574 psi | 90% | 2267 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 47,848 psi | 87% | 2290 fps | 96.1% |
| Somchem S321 | <<locked>> | 84% | 49,255 psi | 89% | 2352 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 49,298 psi | 89% | 2270 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 49,255 psi | 89% | 2349 fps | 99.5% |
| Somchem S355 | <<locked>> | 96% | 49,559 psi | 90% | 2375 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,524 psi | 74% | 2336 fps | 99.8% |
| Unknown powder | <<locked>> | 98% | 47,007 psi | 85% | 2385 fps | 98.1% |
| Vihtavuori N130 | <<locked>> | 82% | 47,369 psi | 86% | 2208 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 47,195 psi | 86% | 2224 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 47,369 psi | 86% | 2287 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 48,660 psi | 88% | 2303 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 47,790 psi | 87% | 2320 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,153 psi | 87% | 2375 fps | 98.6% |
| Vihtavuori N530 | <<locked>> | 86% | 48,689 psi | 88% | 2320 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 46,891 psi | 85% | 2303 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,036 psi | 85% | 2382 fps | 98.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 33,765 psi | 61% | 2224 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,153 psi | 89% | 2365 fps | 99.8% |
| Winchester 748 | <<locked>> | 84% | 48,414 psi | 88% | 2369 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 47,529 psi | 86% | 2405 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 82% | 47,921 psi | 87% | 2359 fps | 99.8% |
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% | 41,756 psi | 76% | 2169 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,150 psi | 82% | 2257 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,214 psi | 62% | 2103 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,001 psi | 71% | 2211 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 39,001 psi | 71% | 2211 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 32,358 psi | 59% | 2093 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 32,198 psi | 58% | 2149 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 38,232 psi | 69% | 2185 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 32,648 psi | 59% | 2060 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,205 psi | 73% | 2195 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 39,450 psi | 72% | 2192 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,514 psi | 84% | 2359 fps | 99.7% |
| Alliant Power Pro 2000-MR | 55.1 gr | 80% | 34,374 psi | 62% | 2195 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,647 psi | 57% | 2077 fps | 97.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,127 psi | 62% | 2126 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 90% | 33,837 psi | 61% | 2162 fps | 95.2% |
| Alliant Reloder-17 | 55.6 gr | 82% | 29,196 psi | 53% | 2083 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 30,284 psi | 55% | 2116 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,101 psi | 67% | 2185 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 30,879 psi | 56% | 2077 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,482 psi | 77% | 2192 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,276 psi | 69% | 2211 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,003 psi | 76% | 2323 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 80% | 42,598 psi | 77% | 2228 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 36,550 psi | 66% | 2169 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 94% | 44,454 psi | 81% | 2356 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 38,479 psi | 70% | 2195 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 28,979 psi | 53% | 2034 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,576 psi | 59% | 2126 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,773 psi | 47% | 1260 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,505 psi | 63% | 2106 fps | 97.5% |
| IMR 3031 | <<locked>> | 80% | 34,461 psi | 63% | 2142 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,024 psi | 58% | 2041 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 46,180 psi | 84% | 2264 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 46,456 psi | 84% | 2300 fps | 95.7% |
| IMR 4831 | <<locked>> | 94% | 32,256 psi | 59% | 2129 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 34,911 psi | 63% | 2152 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 80% | 40,205 psi | 73% | 2195 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 44,947 psi | 82% | 2264 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 36,550 psi | 66% | 2169 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 38,972 psi | 71% | 2136 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 33,852 psi | 61% | 2093 fps | 98.2% |
| Lovex S065 | <<locked>> | 90% | 37,594 psi | 68% | 2162 fps | 95% |
| Lovex S070 | <<locked>> | 96% | 42,598 psi | 77% | 2270 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 37,565 psi | 68% | 2149 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 37,608 psi | 68% | 2159 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 33,533 psi | 61% | 2119 fps | 96.8% |
| Norma URP | <<locked>> | 90% | 33,373 psi | 61% | 2156 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 32,967 psi | 60% | 2126 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 98% | 42,322 psi | 77% | 2326 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 40,132 psi | 73% | 2195 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,175 psi | 71% | 2211 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,511 psi | 79% | 2234 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,121 psi | 47% | 1296 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,281 psi | 82% | 2267 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 42,337 psi | 77% | 2244 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 35,114 psi | 64% | 2205 fps | 96.7% |
| ReloadSwiss RS 60 | 54.3 gr | 80% | 29,254 psi | 53% | 2093 fps | 97.9% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 34,795 psi | 63% | 2215 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 38,189 psi | 69% | 2270 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 41,452 psi | 75% | 2188 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 35,810 psi | 65% | 2110 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 29,153 psi | 53% | 2031 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 37,594 psi | 68% | 2162 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,550 psi | 66% | 2169 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 33,852 psi | 61% | 2093 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 96% | 42,598 psi | 77% | 2270 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,313 psi | 55% | 2070 fps | 95.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,014 psi | 69% | 2169 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,724 psi | 67% | 2159 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,204 psi | 71% | 2113 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,184 psi | 58% | 2005 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 44,715 psi | 81% | 2247 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 43,105 psi | 78% | 2264 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 38,682 psi | 70% | 2119 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 37,782 psi | 69% | 2172 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 30,269 psi | 55% | 2041 fps | 96.2% |
| Somchem S365 | <<locked>> | 86% | 26,295 psi | 48% | 2021 fps | 95.6% |
| Unknown powder | <<locked>> | 90% | 36,506 psi | 66% | 2205 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 44,454 psi | 81% | 2169 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,334 psi | 71% | 2113 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,650 psi | 63% | 2100 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,549 psi | 65% | 2106 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 28,689 psi | 52% | 1988 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 90% | 34,998 psi | 64% | 2156 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 40,147 psi | 73% | 2192 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 34,142 psi | 62% | 2100 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 34,185 psi | 62% | 2162 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 98% | 31,720 psi | 58% | 2178 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 29,414 psi | 53% | 2011 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 42,163 psi | 77% | 2277 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 44,454 psi | 81% | 2356 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,744 psi | 81% | 2313 fps | 99.5% |
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 | 305gr | Hammer Stone Hammer. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,474 fps; across all powders the maximum-charge window runs from 1,414 fps to 2,474 fps. Accurate 3100 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 52–90 %, leaving at least 10 % headroom. The 305.0 gr projectile in 0.375" calls for a 1:17.0 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for .375 Hoelderlin with the .375 | 305gr | Hammer Stone Hammer they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-19, 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.