Load Specifications
Load data in caliber 7 mm KM Katzmaier with .285 | 173gr | Prvi Partizan FMJ BT bullet and 41 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 IMR 8133 Enduron.
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% | 56,768 psi | 89% | 2861 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 53,824 psi | 84% | 2930 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 82% | 56,579 psi | 89% | 2969 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,739 psi | 89% | 2963 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 57,740 psi | 90% | 3107 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 56,956 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,203 psi | 90% | 2963 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,593 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,840 psi | 89% | 2946 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,651 psi | 87% | 3012 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,246 psi | 88% | 3012 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,347 psi | 88% | 2933 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 56,826 psi | 89% | 2959 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,855 psi | 89% | 2979 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,203 psi | 90% | 2963 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,012 psi | 85% | 2920 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,624 psi | 90% | 2943 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,000 psi | 89% | 3045 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,218 psi | 60% | 1906 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,463 psi | 87% | 2959 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,130 psi | 90% | 2894 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,927 psi | 88% | 2979 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 54,998 psi | 86% | 2890 fps | 96.1% |
| Lovex S071 | <<locked>> | 86% | 55,477 psi | 87% | 2841 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,682 psi | 90% | 2999 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,942 psi | 89% | 2982 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,101 psi | 89% | 3031 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 84% | 55,405 psi | 87% | 2907 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,407 psi | 62% | 1952 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,505 psi | 84% | 2963 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,826 psi | 89% | 3009 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,998 psi | 86% | 2890 fps | 96.1% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,405 psi | 87% | 2936 fps | 98.8% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,692 psi | 83% | 2907 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 84% | 57,450 psi | 90% | 2887 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,116 psi | 90% | 2936 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 84% | 54,781 psi | 86% | 2933 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,913 psi | 89% | 3009 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 54,853 psi | 86% | 3018 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,696 psi | 90% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,956 psi | 89% | 2894 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% | 53,098 psi | 83% | 2808 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,074 psi | 63% | 2667 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 80% | 52,823 psi | 83% | 2913 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,914 psi | 63% | 2667 fps | 99.1% |
| ADI AR 2218 | 88.7 gr | 84% | 39,668 psi | 62% | 2746 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 37,333 psi | 59% | 2644 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,534 psi | 84% | 2907 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,170 psi | 82% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,412 psi | 73% | 2782 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,421 psi | 60% | 2671 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 86% | 41,887 psi | 66% | 2740 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,414 psi | 77% | 2815 fps | 98.7% |
| Bofors RP15 | <<locked>> | 80% | 49,908 psi | 78% | 2848 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,308 psi | 68% | 2743 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 53,534 psi | 84% | 2907 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,526 psi | 68% | 2740 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,896 psi | 84% | 2884 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,021 psi | 72% | 2864 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,732 psi | 45% | 1706 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,735 psi | 81% | 2897 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,079 psi | 74% | 2720 fps | 95.1% |
| IMR 8133 Enduron | 77.6 gr | 80% | 34,751 psi | 54% | 2562 fps | 97.5% |
| Lovex D100 | <<locked>> | 88% | 51,285 psi | 80% | 2825 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 45,934 psi | 72% | 2690 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,491 psi | 56% | 2592 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 52,997 psi | 83% | 2920 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 53,142 psi | 83% | 2963 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 80% | 47,805 psi | 75% | 2785 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,559 psi | 46% | 1745 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,963 psi | 72% | 2841 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,148 psi | 66% | 2743 fps | 98.4% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,285 psi | 80% | 2825 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,148 psi | 66% | 2690 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,585 psi | 71% | 2776 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 80% | 50,328 psi | 79% | 2782 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,613 psi | 68% | 2690 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 80% | 47,819 psi | 75% | 2812 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 42,873 psi | 67% | 2753 fps | 98.2% |
| Vihtavuori N570 | 82.8 gr | 80% | 41,089 psi | 64% | 2749 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,490 psi | 84% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,084 psi | 83% | 2838 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 41 powders for 7 mm KM Katzmaier loaded with the .285 | 173gr | Prvi Partizan FMJ BT. ADI AR 2218 delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,107 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 (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.285" calls for a 1:12.0 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, IMR 8133 Enduron rank at the top here: for 7 mm KM Katzmaier with the .285 | 173gr | Prvi Partizan FMJ BT 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.