Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | 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 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% | 56,014 psi | 88% | 2835 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 2963 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 55,622 psi | 87% | 2943 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 55,738 psi | 87% | 2936 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,579 psi | 89% | 3077 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 55,941 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,231 psi | 88% | 2936 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 54,940 psi | 86% | 2841 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 55,898 psi | 88% | 2920 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,491 psi | 85% | 2982 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 54,969 psi | 86% | 2979 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,535 psi | 87% | 2907 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 55,869 psi | 88% | 2930 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 55,825 psi | 87% | 2949 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,231 psi | 88% | 2936 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 56,884 psi | 89% | 2949 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 56,724 psi | 89% | 2913 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 55,927 psi | 88% | 3018 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,276 psi | 60% | 1890 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,246 psi | 90% | 2963 fps | 96.1% |
| IMR 4955 Enduron | <<locked>> | 82% | 57,537 psi | 90% | 2904 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 54,447 psi | 85% | 2930 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,463 psi | 88% | 2867 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 54,810 psi | 86% | 2949 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 54,694 psi | 86% | 2818 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,478 psi | 89% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 55,927 psi | 88% | 2953 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,014 psi | 88% | 3002 fps | 96% |
| Ramshot Magnum | <<locked>> | 84% | 54,404 psi | 85% | 2881 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,320 psi | 62% | 1932 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 56,594 psi | 89% | 3002 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,550 psi | 87% | 2979 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,375 psi | 85% | 2907 fps | 98.7% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 2874 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 84% | 56,565 psi | 89% | 2861 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,144 psi | 88% | 2907 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 86% | 57,479 psi | 90% | 2963 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 55,956 psi | 88% | 2982 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 90% | 57,595 psi | 90% | 3054 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,550 psi | 89% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,115 psi | 88% | 2867 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% | 52,330 psi | 82% | 2782 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,204 psi | 61% | 2641 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 80% | 51,982 psi | 81% | 2884 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,175 psi | 61% | 2641 fps | 99% |
| ADI AR 2218 | 86.7 gr | 84% | 38,885 psi | 61% | 2717 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 36,608 psi | 57% | 2618 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,736 psi | 83% | 2881 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,459 psi | 81% | 2789 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,571 psi | 71% | 2759 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 37,536 psi | 59% | 2641 fps | 95% |
| Alliant Reloder-50 | 90.2 gr | 86% | 41,089 psi | 64% | 2713 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,892 psi | 77% | 2792 fps | 98.6% |
| Bofors RP15 | <<locked>> | 80% | 49,110 psi | 77% | 2818 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,540 psi | 67% | 2713 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 52,736 psi | 83% | 2881 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 42,757 psi | 67% | 2713 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,156 psi | 83% | 2858 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,092 psi | 71% | 2838 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,703 psi | 45% | 1690 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,258 psi | 83% | 2897 fps | 95.1% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,070 psi | 85% | 2848 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 50,894 psi | 80% | 2871 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 84% | 49,530 psi | 78% | 2749 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,171 psi | 54% | 2539 fps | 97.3% |
| Lovex S071 | <<locked>> | 80% | 45,237 psi | 71% | 2667 fps | 100% |
| Norma 217 | <<locked>> | 80% | 34,838 psi | 55% | 2569 fps | 99.2% |
| Ramshot Grand | <<locked>> | 80% | 51,967 psi | 81% | 2890 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,098 psi | 82% | 2933 fps | 95% |
| Ramshot Magnum | <<locked>> | 80% | 46,905 psi | 74% | 2762 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,559 psi | 46% | 1729 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 44,904 psi | 70% | 2812 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,205 psi | 65% | 2717 fps | 98.3% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,278 psi | 65% | 2664 fps | 95.5% |
| Vihtavuori 20N29 | <<locked>> | 98% | 47,921 psi | 75% | 2812 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 80% | 49,603 psi | 78% | 2756 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 42,888 psi | 67% | 2664 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 80% | 46,934 psi | 74% | 2785 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 80% | 42,032 psi | 66% | 2726 fps | 98% |
| Vihtavuori N570 | 80.9 gr | 80% | 40,219 psi | 63% | 2717 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,504 psi | 82% | 2877 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,373 psi | 82% | 2812 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 | 175gr | Sierra MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,077 fps; across all powders the maximum-charge window runs from 1,890 fps to 3,077 fps. Accurate 8700 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 175.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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. ADI AR 2218, Vihtavuori N570, Alliant Reloder-50 rank at the top here: for 7 mm KM Katzmaier with the .284 | 175gr | 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.