Load Specifications
Load data in caliber 8 x 56 R M 89 Port. Krop. with .323 | 150gr | Sierra Pro-Hunter bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, IMR 3031 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% | 43,845 psi | 89% | 2733 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 42,018 psi | 85% | 2723 fps | 98.3% |
| Accurate 2495 | <<locked>> | 94% | 42,525 psi | 86% | 2772 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 42,438 psi | 86% | 2769 fps | 98.1% |
| Accurate 4064 | <<locked>> | 96% | 42,467 psi | 86% | 2792 fps | 99% |
| ADI AR 2219 | <<locked>> | 82% | 44,063 psi | 89% | 2785 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 88% | 42,772 psi | 87% | 2740 fps | 96.3% |
| Alliant AR-Comp | <<locked>> | 90% | 43,453 psi | 88% | 2808 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 42,061 psi | 85% | 2776 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 44,179 psi | 90% | 2749 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 44,208 psi | 90% | 2680 fps | 99.7% |
| Bofors RP3 | <<locked>> | 96% | 41,698 psi | 85% | 2782 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 42,757 psi | 87% | 2694 fps | 97% |
| Hodgdon BL-C2 | <<locked>> | 90% | 43,207 psi | 88% | 2805 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 84% | 43,018 psi | 87% | 2766 fps | 99.3% |
| Hodgdon H335 | <<locked>> | 84% | 43,743 psi | 89% | 2782 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 44,251 psi | 90% | 2851 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,373 psi | 68% | 1768 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 44,150 psi | 90% | 2848 fps | 99.8% |
| IMR 4198 | <<locked>> | 82% | 42,728 psi | 87% | 2684 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 42,772 psi | 87% | 2740 fps | 96.3% |
| Lovex D073.5 | <<locked>> | 84% | 41,959 psi | 85% | 2723 fps | 97.2% |
| Lovex D073.6 | <<locked>> | 92% | 43,526 psi | 88% | 2802 fps | 98.3% |
| Lovex S062 | <<locked>> | 94% | 42,496 psi | 86% | 2749 fps | 96.4% |
| Norma 201 | <<locked>> | 90% | 41,959 psi | 85% | 2726 fps | 96.2% |
| Norma 202 | <<locked>> | 90% | 42,003 psi | 85% | 2749 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,576 psi | 68% | 1811 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 42,554 psi | 86% | 2736 fps | 97.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 42,844 psi | 87% | 2864 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 88% | 43,395 psi | 88% | 2740 fps | 98.5% |
| Rottweil R 902 | <<locked>> | 92% | 42,351 psi | 86% | 2723 fps | 96.3% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 44,222 psi | 90% | 2822 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 92% | 43,526 psi | 88% | 2802 fps | 98.3% |
| Shooters World Precision | <<locked>> | 94% | 42,496 psi | 86% | 2749 fps | 96.4% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 42,525 psi | 86% | 2694 fps | 95.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 44,556 psi | 90% | 2789 fps | 98.8% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 42,206 psi | 86% | 2713 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 44,469 psi | 90% | 2703 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 43,424 psi | 88% | 2697 fps | 99.4% |
| Somchem S321 | <<locked>> | 86% | 43,105 psi | 87% | 2769 fps | 96.8% |
| Somchem S335 | <<locked>> | 90% | 43,439 psi | 88% | 2707 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 84% | 41,989 psi | 85% | 2657 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 44,150 psi | 90% | 2710 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 94% | 43,149 psi | 88% | 2772 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 42,380 psi | 86% | 2730 fps | 98.8% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 43,961 psi | 89% | 2769 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 88% | 42,786 psi | 87% | 2733 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 94% | 43,439 psi | 88% | 2766 fps | 98.6% |
| Winchester 748 | <<locked>> | 90% | 44,092 psi | 89% | 2828 fps | 97.7% |
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% | 34,040 psi | 69% | 2533 fps | 98.8% |
| Accurate 2460 | <<locked>> | 80% | 36,680 psi | 74% | 2612 fps | 97% |
| Accurate 2495 | <<locked>> | 80% | 26,643 psi | 54% | 2405 fps | 96.9% |
| Accurate 2520 | <<locked>> | 80% | 32,184 psi | 65% | 2543 fps | 95% |
| Accurate 4064 | 46 gr | 86% | 30,676 psi | 62% | 2526 fps | 95.8% |
| ADI AR 2219 | <<locked>> | 80% | 41,191 psi | 84% | 2730 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 86% | 40,132 psi | 81% | 2684 fps | 95.6% |
| Alliant AR-Comp | <<locked>> | 80% | 31,299 psi | 63% | 2552 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 39,610 psi | 80% | 2726 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 39,131 psi | 79% | 2654 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 41,452 psi | 84% | 2631 fps | 99.4% |
| Bofors RP3 | <<locked>> | 94% | 38,986 psi | 79% | 2726 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 82% | 37,985 psi | 77% | 2592 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 86% | 37,724 psi | 77% | 2690 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 80% | 37,608 psi | 76% | 2654 fps | 98.4% |
| Hodgdon H335 | <<locked>> | 80% | 38,014 psi | 77% | 2664 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 41,539 psi | 84% | 2795 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,642 psi | 50% | 1578 fps | 100% |
| IMR 3031 | 42.3 gr | 80% | 30,008 psi | 61% | 2523 fps | 97% |
| IMR 4198 | <<locked>> | 80% | 40,205 psi | 82% | 2635 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 40,132 psi | 81% | 2684 fps | 95.6% |
| Lovex D073.5 | <<locked>> | 80% | 36,448 psi | 74% | 2605 fps | 95.6% |
| Lovex D073.6 | <<locked>> | 84% | 33,083 psi | 67% | 2579 fps | 95.3% |
| Lovex S062 | <<locked>> | 92% | 39,842 psi | 81% | 2697 fps | 95.7% |
| Norma 201 | <<locked>> | 88% | 39,581 psi | 80% | 2674 fps | 95.5% |
| Norma 202 | <<locked>> | 80% | 30,429 psi | 62% | 2480 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,714 psi | 50% | 1617 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 37,362 psi | 76% | 2625 fps | 96.3% |
| ReloadSwiss RS 60 | 53.9 gr | 94% | 37,608 psi | 76% | 2740 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 34,243 psi | 69% | 2536 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 90% | 39,929 psi | 81% | 2674 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 98% | 41,321 psi | 84% | 2762 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 33,083 psi | 67% | 2579 fps | 95.3% |
| Shooters World Precision | <<locked>> | 92% | 39,842 psi | 81% | 2697 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 39,639 psi | 80% | 2635 fps | 95% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 41,597 psi | 84% | 2730 fps | 98.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 39,682 psi | 80% | 2664 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 32,735 psi | 66% | 2457 fps | 95.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 28,152 psi | 57% | 2356 fps | 95.3% |
| Somchem S321 | <<locked>> | 82% | 37,782 psi | 77% | 2657 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 32,082 psi | 65% | 2461 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 80% | 37,289 psi | 76% | 2562 fps | 99.7% |
| Vihtavuori N133 | <<locked>> | 80% | 32,561 psi | 66% | 2470 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 80% | 27,572 psi | 56% | 2421 fps | 97.1% |
| Vihtavuori N140 | <<locked>> | 82% | 30,806 psi | 62% | 2470 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 96% | 38,464 psi | 78% | 2661 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 86% | 40,089 psi | 81% | 2680 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 84% | 31,459 psi | 64% | 2500 fps | 95.3% |
| Winchester 748 | <<locked>> | 84% | 36,201 psi | 73% | 2657 fps | 95.3% |
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 49 powders for 8 x 56 R M 89 Port. Krop. loaded with the .323 | 150gr | Sierra Pro-Hunter. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,768 fps to 2,864 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 49 of the 49 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 150.0 gr projectile in 0.323" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Rottweil R 903 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, IMR 3031, Accurate 4064 rank at the top here: for 8 x 56 R M 89 Port. Krop. with the .323 | 150gr | Sierra Pro-Hunter 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.