Load Specifications
Load data in caliber 8 x 56 R M 89 Port. Krop. with .323 | 145gr | Brenneke TIG nature bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, ReloadSwiss RS 60 and Accurate 2520.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 42,859 psi | 87% | 2779 fps | 99.9% |
| Accurate 2460 | <<locked>> | 86% | 43,787 psi | 89% | 2822 fps | 98.5% |
| Accurate 2495 | <<locked>> | 96% | 43,671 psi | 89% | 2858 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 42,612 psi | 86% | 2848 fps | 98% |
| Accurate 4064 | <<locked>> | 98% | 43,555 psi | 88% | 2881 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 82% | 43,062 psi | 87% | 2831 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 90% | 44,599 psi | 90% | 2838 fps | 96.7% |
| Alliant AR-Comp | <<locked>> | 90% | 42,511 psi | 86% | 2858 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 43,816 psi | 89% | 2874 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 84% | 43,236 psi | 88% | 2802 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 43,250 psi | 88% | 2726 fps | 99.5% |
| Bofors RP3 | <<locked>> | 98% | 43,236 psi | 88% | 2877 fps | 96.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 41,771 psi | 85% | 2740 fps | 96.6% |
| Hodgdon BL-C2 | <<locked>> | 90% | 42,119 psi | 85% | 2848 fps | 96.8% |
| Hodgdon H322 | <<locked>> | 84% | 42,018 psi | 85% | 2812 fps | 99.1% |
| Hodgdon H335 | <<locked>> | 84% | 42,772 psi | 87% | 2828 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 43,424 psi | 88% | 2897 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,141 psi | 67% | 1814 fps | 100% |
| IMR 3031 | <<locked>> | 92% | 43,120 psi | 87% | 2894 fps | 99.7% |
| IMR 4198 | <<locked>> | 82% | 42,090 psi | 85% | 2736 fps | 100% |
| IMR 8208 XBR | <<locked>> | 90% | 44,599 psi | 90% | 2838 fps | 96.7% |
| Lovex D073.5 | <<locked>> | 86% | 43,642 psi | 89% | 2822 fps | 97.5% |
| Lovex D073.6 | <<locked>> | 92% | 42,322 psi | 86% | 2844 fps | 97.9% |
| Lovex S062 | <<locked>> | 96% | 44,063 psi | 89% | 2844 fps | 96.7% |
| Norma 201 | <<locked>> | 92% | 43,497 psi | 88% | 2822 fps | 96.5% |
| Norma 202 | <<locked>> | 92% | 43,685 psi | 89% | 2844 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,214 psi | 67% | 1857 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 44,411 psi | 90% | 2838 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 41,916 psi | 85% | 2907 fps | 97.1% |
| Rottweil R 901 | <<locked>> | 88% | 41,945 psi | 85% | 2776 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 94% | 43,888 psi | 89% | 2818 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 92% | 42,322 psi | 86% | 2844 fps | 97.9% |
| Shooters World Precision | <<locked>> | 96% | 44,063 psi | 89% | 2844 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 44,440 psi | 90% | 2795 fps | 96.2% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 43,656 psi | 89% | 2835 fps | 98.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 44,106 psi | 89% | 2815 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 43,642 psi | 89% | 2753 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 42,670 psi | 87% | 2746 fps | 99.2% |
| Somchem S321 | <<locked>> | 86% | 42,221 psi | 86% | 2815 fps | 96.5% |
| Somchem S335 | <<locked>> | 90% | 42,409 psi | 86% | 2749 fps | 99.1% |
| Somchem S355ᴾ | <<locked>> | 100% | 44,396 psi | 90% | 2871 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 86% | 43,584 psi | 88% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 43,410 psi | 88% | 2759 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 94% | 42,047 psi | 85% | 2815 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 94% | 44,121 psi | 89% | 2828 fps | 99.1% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 43,047 psi | 87% | 2815 fps | 96.9% |
| Vihtavuori N530 | <<locked>> | 88% | 41,829 psi | 85% | 2779 fps | 96% |
| Vihtavuori N540 | <<locked>> | 94% | 42,482 psi | 86% | 2808 fps | 98.4% |
| Winchester 748 | <<locked>> | 90% | 43,192 psi | 88% | 2874 fps | 97.4% |
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 2015 | <<locked>> | 80% | 32,895 psi | 67% | 2569 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 35,578 psi | 72% | 2651 fps | 96.6% |
| Accurate 2495 | <<locked>> | 80% | 25,063 psi | 51% | 2418 fps | 96% |
| Accurate 2520 | 49.9 gr | 84% | 34,229 psi | 69% | 2667 fps | 95.6% |
| Accurate 4064 | <<locked>> | 86% | 29,167 psi | 59% | 2549 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 40,277 psi | 82% | 2776 fps | 98.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 39,363 psi | 80% | 2730 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 30,255 psi | 61% | 2589 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 41,075 psi | 83% | 2818 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 37,869 psi | 77% | 2694 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 40,495 psi | 82% | 2674 fps | 99.2% |
| Bofors RP3 | <<locked>> | 96% | 40,466 psi | 82% | 2818 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 36,941 psi | 75% | 2631 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 86% | 36,579 psi | 74% | 2726 fps | 95.1% |
| Hodgdon H322 | <<locked>> | 80% | 36,550 psi | 74% | 2694 fps | 98% |
| Hodgdon H335 | <<locked>> | 80% | 37,173 psi | 75% | 2710 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 40,567 psi | 82% | 2835 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,381 psi | 49% | 1621 fps | 100% |
| IMR 3031 | 43.6 gr | 80% | 28,964 psi | 59% | 2556 fps | 96.4% |
| IMR 4198 | <<locked>> | 80% | 39,363 psi | 80% | 2684 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 39,363 psi | 80% | 2730 fps | 95.2% |
| Lovex D073.5 | <<locked>> | 80% | 35,317 psi | 72% | 2641 fps | 95% |
| Lovex D073.6 | <<locked>> | 86% | 34,418 psi | 70% | 2671 fps | 95.7% |
| Lovex S062 | <<locked>> | 92% | 38,972 psi | 79% | 2740 fps | 95.3% |
| Norma 201 | <<locked>> | 88% | 38,305 psi | 78% | 2710 fps | 95% |
| Norma 202 | <<locked>> | 82% | 31,546 psi | 64% | 2572 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,366 psi | 49% | 1657 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 36,463 psi | 74% | 2667 fps | 95.9% |
| ReloadSwiss RS 60 | 55.6 gr | 94% | 36,782 psi | 75% | 2779 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 32,706 psi | 66% | 2562 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 90% | 38,624 psi | 78% | 2707 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 86% | 34,418 psi | 70% | 2671 fps | 95.7% |
| Shooters World Precision | <<locked>> | 92% | 38,972 psi | 79% | 2740 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 41,379 psi | 84% | 2733 fps | 95.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 40,741 psi | 83% | 2779 fps | 98% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 38,580 psi | 78% | 2703 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 31,604 psi | 64% | 2487 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 29,080 psi | 59% | 2441 fps | 95.6% |
| Somchem S321 | <<locked>> | 84% | 39,407 psi | 80% | 2756 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 30,951 psi | 63% | 2490 fps | 96.1% |
| Somchem S355 | <<locked>> | 98% | 41,611 psi | 84% | 2815 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 36,100 psi | 73% | 2602 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 80% | 31,488 psi | 64% | 2507 fps | 98% |
| Vihtavuori N135 | <<locked>> | 80% | 26,353 psi | 53% | 2444 fps | 96.4% |
| Vihtavuori N140 | <<locked>> | 82% | 29,747 psi | 60% | 2503 fps | 95% |
| Vihtavuori N150 | <<locked>> | 96% | 37,492 psi | 76% | 2700 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 86% | 39,160 psi | 79% | 2723 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 86% | 32,547 psi | 66% | 2589 fps | 95.5% |
| Winchester 748 | <<locked>> | 86% | 37,594 psi | 76% | 2753 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 75 powders for 8 x 56 R M 89 Port. Krop. loaded with the .323 | 145gr | Brenneke TIG nature. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,943 fps; across all powders the maximum-charge window runs from 1,814 fps to 2,943 fps. Alliant Reloder-17 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 67–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.323" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-17, 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. IMR 3031, ReloadSwiss RS 60, Accurate 2520 rank at the top here: for 8 x 56 R M 89 Port. Krop. with the .323 | 145gr | Brenneke TIG nature they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2206H, ADI AR 2208, Alliant Power Pro 2000-MR 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.