Load Specifications
Load data in caliber 8 x 56 R M 89 Port. Krop. with .323 | 200gr | Impala RNFP KO bullet and 54 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-16 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% | 44,411 psi | 90% | 2382 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 44,237 psi | 90% | 2418 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 44,237 psi | 90% | 2490 fps | 97.3% |
| ADI AR 2206H | <<locked>> | 82% | 44,367 psi | 90% | 2418 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 86% | 42,554 psi | 86% | 2372 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 42,772 psi | 87% | 2490 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 44,512 psi | 90% | 2438 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 84% | 42,409 psi | 86% | 2402 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 96% | 43,816 psi | 89% | 2487 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 92% | 44,019 psi | 89% | 2523 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,708 psi | 72% | 2349 fps | 96.3% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 43,033 psi | 87% | 2415 fps | 97.1% |
| Bofors RP3 | <<locked>> | 86% | 41,974 psi | 85% | 2405 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 86% | 42,917 psi | 87% | 2405 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 42,931 psi | 87% | 2434 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 42,743 psi | 87% | 2448 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,520 psi | 72% | 1535 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 42,670 psi | 87% | 2379 fps | 98.5% |
| IMR 3031 | <<locked>> | 82% | 43,787 psi | 89% | 2425 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 41,945 psi | 85% | 2352 fps | 97.5% |
| IMR 4831 | <<locked>> | 96% | 42,409 psi | 86% | 2441 fps | 97% |
| IMR 4895 | <<locked>> | 84% | 43,381 psi | 88% | 2431 fps | 98.3% |
| Lovex D073.6 | <<locked>> | 82% | 43,337 psi | 88% | 2405 fps | 99.9% |
| Lovex S060 | <<locked>> | 82% | 44,556 psi | 90% | 2359 fps | 98.4% |
| Lovex S062 | <<locked>> | 84% | 42,119 psi | 85% | 2365 fps | 99% |
| Norma 201 | <<locked>> | 82% | 43,888 psi | 89% | 2379 fps | 99.2% |
| Norma 202 | <<locked>> | 82% | 43,772 psi | 89% | 2388 fps | 100% |
| Norma 203B | <<locked>> | 86% | 44,411 psi | 90% | 2441 fps | 98.5% |
| Norma URP | <<locked>> | 96% | 44,092 psi | 89% | 2480 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 86% | 43,845 psi | 89% | 2454 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,868 psi | 73% | 1572 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 44,106 psi | 89% | 2497 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 43,961 psi | 89% | 2533 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 43,540 psi | 88% | 2500 fps | 96.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 44,251 psi | 90% | 2510 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 84% | 44,324 psi | 90% | 2379 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 90% | 44,599 psi | 90% | 2441 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 82% | 43,337 psi | 88% | 2405 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 42,119 psi | 85% | 2365 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 42,728 psi | 87% | 2441 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 42,670 psi | 87% | 2388 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 44,498 psi | 90% | 2336 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 43,888 psi | 89% | 2398 fps | 98.2% |
| Somchem S355 | <<locked>> | 88% | 42,902 psi | 87% | 2402 fps | 98.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,483 psi | 90% | 2530 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 84% | 43,236 psi | 88% | 2362 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 44,005 psi | 89% | 2372 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 43,323 psi | 88% | 2385 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 94% | 43,279 psi | 88% | 2428 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 84% | 42,366 psi | 86% | 2365 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 94% | 42,612 psi | 86% | 2438 fps | 96.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,043 psi | 77% | 2421 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 43,685 psi | 89% | 2415 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 82% | 41,843 psi | 85% | 2392 fps | 98.4% |
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% | 39,392 psi | 80% | 2300 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,217 psi | 75% | 2290 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 36,564 psi | 74% | 2346 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 41,742 psi | 85% | 2369 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 35,781 psi | 73% | 2238 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,623 psi | 76% | 2379 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,186 psi | 71% | 2260 fps | 97.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,710 psi | 76% | 2310 fps | 96.3% |
| Alliant Reloder-16 | 46.5 gr | 90% | 37,043 psi | 75% | 2346 fps | 95.1% |
| Alliant Reloder-17 | 45.6 gr | 82% | 32,460 psi | 66% | 2267 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 33,750 psi | 68% | 2303 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,480 psi | 82% | 2369 fps | 96.5% |
| Bofors RP3 | <<locked>> | 80% | 35,027 psi | 71% | 2267 fps | 97.2% |
| Hodgdon H380 | <<locked>> | 84% | 40,350 psi | 82% | 2356 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,140 psi | 65% | 2211 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,768 psi | 77% | 2349 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 54% | 1371 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,306 psi | 82% | 2336 fps | 98% |
| IMR 3031 | <<locked>> | 80% | 41,234 psi | 84% | 2385 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,463 psi | 76% | 2267 fps | 96.3% |
| IMR 4831 | <<locked>> | 92% | 37,652 psi | 76% | 2349 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 38,580 psi | 78% | 2339 fps | 97.2% |
| Lovex D073.6 | <<locked>> | 80% | 40,712 psi | 83% | 2359 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 42,163 psi | 86% | 2316 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 37,695 psi | 76% | 2280 fps | 98.2% |
| Norma 201 | <<locked>> | 80% | 41,481 psi | 84% | 2336 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 41,104 psi | 83% | 2343 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 37,115 psi | 75% | 2303 fps | 96.8% |
| Norma URP | <<locked>> | 90% | 36,898 psi | 75% | 2339 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 36,361 psi | 74% | 2306 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,963 psi | 55% | 1407 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,783 psi | 79% | 2395 fps | 96.6% |
| ReloadSwiss RS 60 | 44.5 gr | 80% | 32,416 psi | 66% | 2277 fps | 97.9% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 38,537 psi | 78% | 2402 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 41,655 psi | 84% | 2457 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 39,595 psi | 80% | 2293 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,141 psi | 67% | 2218 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,712 psi | 83% | 2359 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 37,695 psi | 76% | 2280 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,591 psi | 68% | 2251 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,161 psi | 81% | 2343 fps | 97.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,331 psi | 72% | 2178 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 41,336 psi | 84% | 2356 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 33,997 psi | 69% | 2224 fps | 96.3% |
| Somchem S365 | <<locked>> | 86% | 29,776 psi | 60% | 2208 fps | 95.9% |
| Vihtavuori N135 | <<locked>> | 80% | 38,421 psi | 78% | 2283 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,059 psi | 79% | 2287 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 32,198 psi | 65% | 2169 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 90% | 38,522 psi | 78% | 2339 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 37,492 psi | 76% | 2277 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 37,913 psi | 77% | 2346 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 98% | 35,955 psi | 73% | 2375 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,372 psi | 66% | 2182 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,320 psi | 80% | 2343 fps | 97.9% |
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 54 powders for 8 x 56 R M 89 Port. Krop. loaded with the .323 | 200gr | Impala RNFP KO. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,533 fps; across all powders the maximum-charge window runs from 1,535 fps to 2,533 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 54 of the 54 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.323" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Hodgdon TrailBoss, ReloadSwiss RS 14 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-16, Alliant Reloder-17 rank at the top here: for 8 x 56 R M 89 Port. Krop. with the .323 | 200gr | Impala RNFP KO 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.