Load Specifications
Load data in caliber 8 x 56 R M 89 Port. Krop. with .323 | 120gr | Impala LWHV LS bullet and 30 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Alliant AR-Comp and Accurate 4064.
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 2015 | <<locked>> | 88% | 42,743 psi | 87% | 3002 fps | 99% |
| Accurate 2460 | <<locked>> | 86% | 43,947 psi | 89% | 3041 fps | 96.8% |
| Accurate 2495 | <<locked>> | 96% | 44,541 psi | 90% | 3100 fps | 99.5% |
| Accurate 2520 | <<locked>> | 90% | 43,743 psi | 89% | 3077 fps | 96.3% |
| Accurate 4064 | <<locked>> | 98% | 43,961 psi | 89% | 3110 fps | 97.6% |
| Accurate LT-30 | <<locked>> | 82% | 44,193 psi | 90% | 2956 fps | 98.2% |
| Accurate LT-32 | <<locked>> | 82% | 44,469 psi | 90% | 2963 fps | 96.5% |
| ADI AR 2219 | <<locked>> | 82% | 42,337 psi | 86% | 3045 fps | 97.7% |
| Alliant AR-Comp | <<locked>> | 92% | 44,222 psi | 90% | 3133 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 42,917 psi | 87% | 3028 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 42,728 psi | 87% | 2936 fps | 98.2% |
| Hodgdon H322 | <<locked>> | 86% | 43,874 psi | 89% | 3077 fps | 98% |
| Hodgdon H335 | <<locked>> | 84% | 42,119 psi | 85% | 3035 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,475 psi | 68% | 1998 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 42,366 psi | 86% | 3110 fps | 98.5% |
| IMR 4198 | <<locked>> | 84% | 43,758 psi | 89% | 3009 fps | 100% |
| Norma 202 | <<locked>> | 92% | 43,105 psi | 87% | 3054 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,649 psi | 68% | 2044 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 43,758 psi | 89% | 3041 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 88% | 43,134 psi | 87% | 3012 fps | 96.6% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 42,975 psi | 87% | 3048 fps | 96.7% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 43,018 psi | 87% | 3028 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 43,149 psi | 88% | 2959 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 44,512 psi | 90% | 3002 fps | 98.1% |
| Somchem S335 | <<locked>> | 90% | 42,540 psi | 86% | 2966 fps | 97.6% |
| Vihtavuori N130 | <<locked>> | 86% | 43,250 psi | 88% | 2972 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 90% | 42,540 psi | 86% | 2969 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 96% | 44,019 psi | 89% | 3087 fps | 99.4% |
| Vihtavuori N140 | <<locked>> | 94% | 43,207 psi | 88% | 3028 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 96% | 44,585 psi | 90% | 3071 fps | 97.1% |
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 2015 | <<locked>> | 80% | 33,750 psi | 68% | 2785 fps | 96.9% |
| Accurate 2460 | <<locked>> | 82% | 38,638 psi | 78% | 2923 fps | 95.3% |
| Accurate 2495 | <<locked>> | 82% | 29,008 psi | 59% | 2717 fps | 95.5% |
| Accurate 2520 | <<locked>> | 88% | 41,089 psi | 83% | 3018 fps | 95.5% |
| Accurate 4064 | 52.4 gr | 92% | 36,724 psi | 74% | 2943 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 41,727 psi | 85% | 2900 fps | 97.7% |
| Accurate LT-32 | <<locked>> | 80% | 42,032 psi | 85% | 2907 fps | 95.8% |
| ADI AR 2219 | <<locked>> | 80% | 39,682 psi | 80% | 2982 fps | 97% |
| Alliant AR-Comp | 45.1 gr | 80% | 30,879 psi | 63% | 2802 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 38,130 psi | 77% | 2920 fps | 99% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 40,074 psi | 81% | 2877 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 36,419 psi | 74% | 2904 fps | 96% |
| Hodgdon H335 | <<locked>> | 82% | 39,436 psi | 80% | 2972 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,976 psi | 51% | 1791 fps | 100% |
| IMR 3031 | 47.3 gr | 84% | 33,359 psi | 68% | 2877 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 39,030 psi | 79% | 2907 fps | 99.6% |
| Norma 202 | <<locked>> | 88% | 38,261 psi | 78% | 2943 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,063 psi | 51% | 1834 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 41,336 psi | 84% | 2989 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 84% | 38,667 psi | 78% | 2904 fps | 95.2% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 40,437 psi | 82% | 2986 fps | 96% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 38,189 psi | 77% | 2917 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 38,421 psi | 78% | 2851 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 35,070 psi | 71% | 2789 fps | 95.6% |
| Somchem S335 | <<locked>> | 84% | 35,694 psi | 72% | 2805 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 36,419 psi | 74% | 2818 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 80% | 31,821 psi | 65% | 2710 fps | 96.1% |
| Vihtavuori N135 | <<locked>> | 82% | 28,979 psi | 59% | 2707 fps | 95.2% |
| Vihtavuori N140 | <<locked>> | 88% | 36,245 psi | 74% | 2871 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 92% | 39,407 psi | 80% | 2959 fps | 95.7% |
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 67 powders for 8 x 56 R M 89 Port. Krop. loaded with the .323 | 120gr | Impala LWHV LS. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,150 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,150 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 67 of the 67 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.323" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, ReloadSwiss RS 60 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. IMR 3031, Alliant AR-Comp, Accurate 4064 rank at the top here: for 8 x 56 R M 89 Port. Krop. with the .323 | 120gr | Impala LWHV LS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2206H, ADI Benchmark 8208, Alliant Power Pro 1200-R 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.