Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 180gr | Sierra MatchKing 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% | 57,000 psi | 89% | 2815 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 53,737 psi | 84% | 2884 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 82% | 56,637 psi | 89% | 2923 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,695 psi | 89% | 2917 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 53,505 psi | 84% | 2992 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 92% | 57,072 psi | 89% | 2940 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,261 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,724 psi | 87% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,043 psi | 89% | 2900 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,796 psi | 87% | 2969 fps | 99.6% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,376 psi | 88% | 2969 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,434 psi | 88% | 2887 fps | 99.7% |
| Bofors RP15 | <<locked>> | 84% | 56,869 psi | 89% | 2910 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,956 psi | 89% | 2933 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,261 psi | 90% | 2913 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,041 psi | 85% | 2874 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,696 psi | 90% | 2894 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,246 psi | 90% | 2999 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,305 psi | 60% | 1867 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,506 psi | 87% | 2910 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,203 psi | 90% | 2848 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,014 psi | 88% | 2933 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,100 psi | 86% | 2848 fps | 96.4% |
| Lovex S071 | <<locked>> | 86% | 55,666 psi | 87% | 2795 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,056 psi | 85% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,130 psi | 90% | 2933 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,130 psi | 90% | 2986 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 84% | 55,550 psi | 87% | 2861 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,363 psi | 62% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,751 psi | 84% | 2920 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,855 psi | 89% | 2963 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,100 psi | 86% | 2848 fps | 96.4% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,448 psi | 87% | 2894 fps | 99% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,721 psi | 83% | 2867 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 84% | 57,551 psi | 90% | 2841 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,217 psi | 90% | 2890 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 84% | 54,810 psi | 86% | 2884 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,014 psi | 89% | 2963 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 54,926 psi | 86% | 2976 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,624 psi | 90% | 2910 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,058 psi | 89% | 2848 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% | 53,229 psi | 83% | 2762 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,190 psi | 63% | 2631 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 80% | 52,968 psi | 83% | 2864 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,030 psi | 63% | 2628 fps | 99.3% |
| ADI AR 2218 | 84.4 gr | 82% | 36,912 psi | 58% | 2635 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 37,318 psi | 58% | 2602 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,664 psi | 84% | 2861 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,199 psi | 82% | 2766 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,514 psi | 73% | 2740 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,479 psi | 60% | 2635 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 84% | 39,001 psi | 61% | 2635 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,530 psi | 78% | 2772 fps | 98.9% |
| Bofors RP15 | <<locked>> | 80% | 49,980 psi | 78% | 2799 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,439 psi | 68% | 2700 fps | 99.7% |
| Bofors RP5 | <<locked>> | 80% | 53,664 psi | 84% | 2861 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,700 psi | 68% | 2700 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 54,070 psi | 85% | 2838 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,050 psi | 72% | 2822 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,848 psi | 45% | 1670 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,895 psi | 81% | 2851 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,210 psi | 74% | 2677 fps | 95.5% |
| IMR 8133 Enduron | 75.6 gr | 80% | 34,824 psi | 55% | 2526 fps | 97.8% |
| Lovex D100 | <<locked>> | 88% | 51,300 psi | 80% | 2782 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 46,035 psi | 72% | 2648 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,723 psi | 56% | 2559 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 53,098 psi | 83% | 2874 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 53,113 psi | 83% | 2920 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 80% | 47,935 psi | 75% | 2743 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,704 psi | 47% | 1709 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,021 psi | 72% | 2799 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,192 psi | 66% | 2703 fps | 98.7% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,300 psi | 80% | 2782 fps | 95.5% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 39,392 psi | 62% | 2592 fps | 95.1% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,629 psi | 72% | 2740 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 80% | 50,444 psi | 79% | 2736 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,671 psi | 68% | 2651 fps | 96% |
| Vihtavuori N565 | <<locked>> | 80% | 47,834 psi | 75% | 2766 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 42,989 psi | 67% | 2713 fps | 98.5% |
| Vihtavuori N570 | 80.7 gr | 80% | 41,176 psi | 65% | 2710 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,534 psi | 84% | 2854 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,301 psi | 84% | 2792 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 .284 | 180gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 2,999 fps; across all powders the maximum-charge window runs from 1,867 fps to 2,999 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 180.0 gr projectile in 0.284" calls for a 1:10.0 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 .284 | 180gr | Sierra MatchKing 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.