Load Specifications
Load data in caliber 8 x 56 R M 89 Port. Krop. with .323 | 220gr | Barnes Solid RN bullet and 66 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 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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Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 42,859 psi | 87% | 2267 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 43,221 psi | 88% | 2310 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 44,208 psi | 90% | 2395 fps | 98.4% |
| ADI AR 2206H | <<locked>> | 82% | 44,077 psi | 89% | 2323 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 86% | 42,438 psi | 86% | 2280 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 42,801 psi | 87% | 2402 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 41,887 psi | 85% | 2303 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 84% | 42,351 psi | 86% | 2313 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 96% | 44,034 psi | 89% | 2405 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 92% | 44,193 psi | 90% | 2434 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,259 psi | 72% | 2267 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,754 psi | 79% | 2392 fps | 96.4% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 43,134 psi | 87% | 2326 fps | 98.2% |
| Bofors RP3 | <<locked>> | 88% | 44,353 psi | 90% | 2356 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 86% | 42,540 psi | 86% | 2313 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 82% | 44,469 psi | 90% | 2333 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 43,091 psi | 87% | 2349 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 43,062 psi | 87% | 2359 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 71% | 1463 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 42,844 psi | 87% | 2293 fps | 99.3% |
| IMR 3031 | <<locked>> | 82% | 44,048 psi | 89% | 2326 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 44,599 psi | 90% | 2310 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 42,467 psi | 86% | 2352 fps | 98.1% |
| IMR 4895 | <<locked>> | 84% | 43,395 psi | 88% | 2339 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 82% | 43,120 psi | 87% | 2306 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 44,599 psi | 90% | 2270 fps | 99.2% |
| Lovex S062 | <<locked>> | 86% | 44,353 psi | 90% | 2313 fps | 99.8% |
| Lovex S065 | <<locked>> | 92% | 43,671 psi | 89% | 2306 fps | 96.8% |
| Lovex S070 | <<locked>> | 94% | 43,845 psi | 89% | 2329 fps | 95.7% |
| Norma 201 | <<locked>> | 82% | 43,308 psi | 88% | 2283 fps | 99.7% |
| Norma 202 | <<locked>> | 82% | 43,424 psi | 88% | 2287 fps | 100% |
| Norma 203B | <<locked>> | 86% | 44,498 psi | 90% | 2352 fps | 99.2% |
| Norma URP | <<locked>> | 96% | 44,353 psi | 90% | 2395 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 86% | 43,976 psi | 89% | 2365 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 96% | 43,468 psi | 88% | 2385 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,708 psi | 72% | 1503 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 43,265 psi | 88% | 2300 fps | 96% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 44,599 psi | 90% | 2408 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 44,135 psi | 90% | 2441 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 44,048 psi | 89% | 2418 fps | 98.1% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 41,655 psi | 84% | 2379 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 84% | 43,772 psi | 89% | 2283 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 90% | 44,483 psi | 90% | 2349 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 43,671 psi | 89% | 2306 fps | 96.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 43,120 psi | 87% | 2306 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 44,353 psi | 90% | 2313 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 94% | 43,845 psi | 89% | 2329 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 42,801 psi | 87% | 2352 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 44,367 psi | 90% | 2313 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 42,714 psi | 87% | 2300 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 42,076 psi | 85% | 2205 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 44,382 psi | 90% | 2241 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 43,947 psi | 89% | 2310 fps | 99.1% |
| Somchem S355 | <<locked>> | 88% | 42,467 psi | 86% | 2306 fps | 99.2% |
| Somchem S365 | <<locked>> | 98% | 42,105 psi | 85% | 2398 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 84% | 43,134 psi | 87% | 2264 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 43,816 psi | 89% | 2274 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 43,410 psi | 88% | 2293 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 94% | 43,729 psi | 89% | 2349 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 84% | 42,322 psi | 86% | 2270 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 42,902 psi | 87% | 2352 fps | 97.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,753 psi | 77% | 2333 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 44,121 psi | 89% | 2336 fps | 99.5% |
| Winchester 760 | <<locked>> | 94% | 44,585 psi | 90% | 2398 fps | 95.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,488 psi | 64% | 2247 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 82% | 41,945 psi | 85% | 2303 fps | 99.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 37,811 psi | 77% | 2188 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 35,781 psi | 73% | 2185 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 33,663 psi | 68% | 2205 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 41,539 psi | 84% | 2280 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 35,244 psi | 71% | 2146 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,333 psi | 76% | 2293 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,693 psi | 70% | 2169 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,376 psi | 76% | 2221 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,621 psi | 70% | 2218 fps | 95.8% |
| Alliant Reloder-17 | 44.4 gr | 80% | 29,965 psi | 61% | 2136 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,530 psi | 60% | 2129 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,245 psi | 74% | 2339 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,393 psi | 82% | 2280 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 33,982 psi | 69% | 2169 fps | 98% |
| Hodgdon H380 | <<locked>> | 80% | 35,085 psi | 71% | 2172 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 41,887 psi | 85% | 2290 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,805 psi | 60% | 2083 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,724 psi | 77% | 2264 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 53% | 1302 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,103 psi | 81% | 2244 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 41,278 psi | 84% | 2287 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,985 psi | 75% | 2175 fps | 97.4% |
| IMR 4831 | <<locked>> | 88% | 32,822 psi | 67% | 2169 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 38,247 psi | 78% | 2247 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 80% | 40,292 psi | 82% | 2264 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,843 psi | 85% | 2224 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 36,811 psi | 75% | 2182 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 38,653 psi | 78% | 2218 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 41,336 psi | 84% | 2283 fps | 95% |
| Norma 201 | <<locked>> | 80% | 40,814 psi | 83% | 2241 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 40,901 psi | 83% | 2247 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,753 psi | 75% | 2211 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 34,418 psi | 70% | 2208 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 35,969 psi | 73% | 2218 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 40,770 psi | 83% | 2336 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 54% | 1339 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 40,596 psi | 82% | 2251 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,798 psi | 79% | 2306 fps | 97.8% |
| ReloadSwiss RS 60 | 44.4 gr | 80% | 31,923 psi | 65% | 2195 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,853 psi | 73% | 2267 fps | 95.8% |
| ReloadSwiss RS 70 | 51.8 gr | 92% | 39,073 psi | 79% | 2329 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 38,827 psi | 79% | 2198 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 32,053 psi | 65% | 2119 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,653 psi | 78% | 2218 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,292 psi | 82% | 2264 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,811 psi | 75% | 2182 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 41,336 psi | 84% | 2283 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,185 psi | 67% | 2165 fps | 96.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,582 psi | 84% | 2267 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,074 psi | 81% | 2254 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,954 psi | 71% | 2087 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,858 psi | 85% | 2205 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,176 psi | 84% | 2264 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 33,199 psi | 67% | 2129 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 25,483 psi | 52% | 2024 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 38,000 psi | 77% | 2185 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,609 psi | 78% | 2192 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,343 psi | 64% | 2073 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 33,910 psi | 69% | 2165 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 37,144 psi | 75% | 2185 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 35,215 psi | 71% | 2211 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 31,270 psi | 63% | 2192 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,820 psi | 60% | 2054 fps | 95.8% |
| Winchester 760 | <<locked>> | 92% | 42,032 psi | 85% | 2352 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,588 psi | 60% | 2192 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,291 psi | 80% | 2257 fps | 98.8% |
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 66 powders for 8 x 56 R M 89 Port. Krop. loaded with the .323 | 220gr | Barnes Solid RN. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,441 fps; across all powders the maximum-charge window runs from 1,463 fps to 2,441 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 66 of the 66 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 64–90 %, leaving at least 10 % headroom. The 220.0 gr projectile in 0.323" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, Hodgdon TrailBoss 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, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for 8 x 56 R M 89 Port. Krop. with the .323 | 220gr | Barnes Solid RN 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.