Load Specifications
Load data in caliber 8 x 56 R M 89 Port. Krop. with .323 | 150gr | Impala LWHV LS bullet and 41 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Hodgdon BL-C2 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>> | 86% | 44,324 psi | 90% | 2710 fps | 99.9% |
| Accurate 2460 | <<locked>> | 82% | 42,714 psi | 87% | 2703 fps | 98.3% |
| Accurate 2495 | <<locked>> | 92% | 44,005 psi | 89% | 2762 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 42,902 psi | 87% | 2749 fps | 98% |
| Accurate 4064 | <<locked>> | 94% | 43,830 psi | 89% | 2785 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 42,815 psi | 87% | 2713 fps | 96.2% |
| Alliant AR-Comp | <<locked>> | 88% | 43,482 psi | 88% | 2782 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 42,192 psi | 86% | 2753 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 82% | 44,498 psi | 90% | 2726 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 84% | 42,685 psi | 87% | 2664 fps | 96.8% |
| Hodgdon BL-C2 | <<locked>> | 88% | 43,163 psi | 88% | 2776 fps | 97% |
| Hodgdon H322 | <<locked>> | 82% | 42,830 psi | 87% | 2736 fps | 99.2% |
| Hodgdon H335 | <<locked>> | 82% | 43,294 psi | 88% | 2746 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 43,918 psi | 89% | 2815 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,301 psi | 70% | 1765 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 44,150 psi | 90% | 2822 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 42,815 psi | 87% | 2713 fps | 96.2% |
| Lovex D073.5 | <<locked>> | 82% | 42,395 psi | 86% | 2697 fps | 97.1% |
| Lovex D073.6 | <<locked>> | 90% | 44,005 psi | 89% | 2782 fps | 98.2% |
| Lovex S062 | <<locked>> | 92% | 42,786 psi | 87% | 2726 fps | 96.3% |
| Norma 201 | <<locked>> | 88% | 42,743 psi | 87% | 2707 fps | 96.2% |
| Norma 202 | <<locked>> | 88% | 42,322 psi | 86% | 2726 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,432 psi | 70% | 1808 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 42,525 psi | 86% | 2707 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 42,670 psi | 87% | 2831 fps | 97.2% |
| Rottweil R 901 | <<locked>> | 86% | 44,483 psi | 90% | 2723 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 90% | 43,062 psi | 87% | 2707 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 90% | 44,005 psi | 89% | 2782 fps | 98.2% |
| Shooters World Precision | <<locked>> | 92% | 42,786 psi | 87% | 2726 fps | 96.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 41,930 psi | 85% | 2628 fps | 98.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 43,294 psi | 88% | 2671 fps | 99.3% |
| Somchem S321 | <<locked>> | 84% | 43,062 psi | 87% | 2740 fps | 96.6% |
| Somchem S335 | <<locked>> | 88% | 43,801 psi | 89% | 2684 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 84% | 44,599 psi | 90% | 2674 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 44,237 psi | 90% | 2684 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 92% | 43,424 psi | 88% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 42,322 psi | 86% | 2703 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 98% | 43,961 psi | 89% | 2746 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 86% | 42,888 psi | 87% | 2710 fps | 96.3% |
| Vihtavuori N540 | <<locked>> | 92% | 43,540 psi | 88% | 2740 fps | 98.5% |
| Winchester 748 | <<locked>> | 88% | 43,961 psi | 89% | 2799 fps | 97.5% |
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% | 37,391 psi | 76% | 2572 fps | 99.3% |
| Accurate 2460 | <<locked>> | 80% | 40,132 psi | 81% | 2651 fps | 97.7% |
| Accurate 2495 | <<locked>> | 80% | 30,806 psi | 62% | 2477 fps | 98.2% |
| Accurate 2520 | <<locked>> | 80% | 35,404 psi | 72% | 2589 fps | 96% |
| Accurate 4064 | 43.2 gr | 82% | 30,748 psi | 62% | 2487 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 40,321 psi | 82% | 2657 fps | 95.4% |
| Alliant AR-Comp | <<locked>> | 80% | 34,011 psi | 69% | 2585 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 39,871 psi | 81% | 2703 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 42,076 psi | 85% | 2680 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,116 psi | 77% | 2566 fps | 95.5% |
| Hodgdon BL-C2 | 48.2 gr | 84% | 37,985 psi | 77% | 2667 fps | 95.5% |
| Hodgdon H322 | <<locked>> | 80% | 40,176 psi | 81% | 2680 fps | 98.8% |
| Hodgdon H335 | <<locked>> | 80% | 40,785 psi | 83% | 2697 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 41,350 psi | 84% | 2762 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,469 psi | 52% | 1575 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 32,706 psi | 66% | 2566 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 84% | 40,321 psi | 82% | 2657 fps | 95.4% |
| Lovex D073.5 | <<locked>> | 80% | 39,943 psi | 81% | 2648 fps | 96.4% |
| Lovex D073.6 | <<locked>> | 82% | 34,243 psi | 69% | 2572 fps | 95.5% |
| Lovex S062 | <<locked>> | 88% | 38,334 psi | 78% | 2631 fps | 95% |
| Norma 201 | <<locked>> | 86% | 40,422 psi | 82% | 2657 fps | 95.6% |
| Norma 202 | <<locked>> | 80% | 33,257 psi | 67% | 2520 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,686 psi | 52% | 1614 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 39,972 psi | 81% | 2654 fps | 96.9% |
| ReloadSwiss RS 60 | 52 gr | 92% | 37,695 psi | 76% | 2713 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 37,869 psi | 77% | 2582 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 88% | 40,567 psi | 82% | 2654 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 34,243 psi | 69% | 2572 fps | 95.5% |
| Shooters World Precision | <<locked>> | 88% | 38,334 psi | 78% | 2631 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,375 psi | 72% | 2487 fps | 96.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,950 psi | 59% | 2346 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 37,971 psi | 77% | 2628 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 34,983 psi | 71% | 2497 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 80% | 39,885 psi | 81% | 2585 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 80% | 35,041 psi | 71% | 2497 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 80% | 30,472 psi | 62% | 2464 fps | 98% |
| Vihtavuori N140 | <<locked>> | 80% | 31,517 psi | 64% | 2457 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 92% | 36,680 psi | 74% | 2595 fps | 95% |
| Vihtavuori N530 | <<locked>> | 84% | 40,306 psi | 82% | 2654 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 82% | 32,300 psi | 66% | 2490 fps | 95.4% |
| Winchester 748 | <<locked>> | 82% | 36,448 psi | 74% | 2631 fps | 95.2% |
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 41 powders for 8 x 56 R M 89 Port. Krop. loaded with the .323 | 150gr | Impala LWHV LS. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,831 fps; across all powders the maximum-charge window runs from 1,765 fps to 2,831 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 41 of the 41 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.323" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. 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, Hodgdon BL-C2, Accurate 4064 rank at the top here: for 8 x 56 R M 89 Port. Krop. with the .323 | 150gr | Impala LWHV LS 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.