Load Specifications
Load data in caliber 7 mm KM Katzmaier with .285 | 173gr | Prvi Partizan SP bullet and 39 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Alliant Reloder-50.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 57,101 psi | 89% | 2864 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 54,389 psi | 85% | 2936 fps | 99% |
| ADI AR 2213 | <<locked>> | 82% | 56,884 psi | 89% | 2976 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,058 psi | 89% | 2969 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 54,012 psi | 85% | 3045 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 92% | 57,464 psi | 90% | 2992 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,522 psi | 90% | 2969 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 56,130 psi | 88% | 2871 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,363 psi | 90% | 2953 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 56,115 psi | 88% | 3015 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,855 psi | 89% | 3022 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,739 psi | 89% | 2940 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 57,116 psi | 90% | 2963 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,174 psi | 90% | 2982 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,522 psi | 90% | 2969 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,491 psi | 85% | 2927 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,551 psi | 90% | 3054 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,218 psi | 60% | 1909 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,811 psi | 87% | 2963 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,551 psi | 90% | 2904 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,434 psi | 88% | 2986 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,376 psi | 87% | 2894 fps | 96.2% |
| Lovex S071 | <<locked>> | 86% | 55,970 psi | 88% | 2851 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,317 psi | 85% | 2949 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,493 psi | 90% | 2989 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,493 psi | 90% | 3038 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 84% | 55,912 psi | 88% | 2913 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,392 psi | 62% | 1955 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 54,027 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,290 psi | 90% | 3015 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,376 psi | 87% | 2894 fps | 96.2% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,782 psi | 87% | 2943 fps | 98.9% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 53,069 psi | 83% | 2917 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 84% | 57,711 psi | 90% | 2894 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,377 psi | 90% | 2940 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 84% | 55,085 psi | 86% | 2936 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,392 psi | 90% | 3018 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 55,143 psi | 86% | 3022 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,261 psi | 90% | 2900 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 53,417 psi | 84% | 2815 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,451 psi | 63% | 2677 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 80% | 53,142 psi | 83% | 2917 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,219 psi | 63% | 2674 fps | 99.1% |
| ADI AR 2218 | 89.3 gr | 84% | 40,030 psi | 63% | 2753 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 37,623 psi | 59% | 2648 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,838 psi | 84% | 2910 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,504 psi | 82% | 2818 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,731 psi | 73% | 2789 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,696 psi | 61% | 2674 fps | 95.4% |
| Alliant Reloder-50 | 90.7 gr | 84% | 39,378 psi | 62% | 2680 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,835 psi | 78% | 2822 fps | 98.7% |
| Bofors RP15 | <<locked>> | 80% | 50,212 psi | 79% | 2851 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,627 psi | 68% | 2746 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 53,838 psi | 84% | 2910 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,845 psi | 69% | 2746 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,383 psi | 73% | 2871 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,790 psi | 45% | 1709 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 52,069 psi | 82% | 2904 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,311 psi | 74% | 2723 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,041 psi | 55% | 2572 fps | 97.6% |
| Lovex D100 | <<locked>> | 88% | 51,648 psi | 81% | 2835 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 46,253 psi | 72% | 2697 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,795 psi | 56% | 2598 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 53,359 psi | 84% | 2927 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 53,577 psi | 84% | 2972 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 80% | 48,269 psi | 76% | 2795 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,617 psi | 46% | 1749 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,325 psi | 73% | 2844 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,453 psi | 67% | 2749 fps | 98.5% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,648 psi | 81% | 2835 fps | 95.3% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,525 psi | 67% | 2697 fps | 95.9% |
| Vihtavuori 20N29 | <<locked>> | 96% | 46,108 psi | 72% | 2789 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 80% | 50,633 psi | 79% | 2785 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,874 psi | 69% | 2697 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 80% | 48,109 psi | 75% | 2818 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 43,163 psi | 68% | 2759 fps | 98.3% |
| Vihtavuori N570 | 83.3 gr | 80% | 41,394 psi | 65% | 2753 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,563 psi | 84% | 2844 fps | 100% |
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 39 powders for 7 mm KM Katzmaier loaded with the .285 | 173gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,054 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 39 of the 39 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.285" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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. ADI AR 2218, Vihtavuori N570, Alliant Reloder-50 rank at the top here: for 7 mm KM Katzmaier with the .285 | 173gr | Prvi Partizan SP 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.