Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 183gr | Sierra MatchKing bullet and 42 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% | 56,362 psi | 88% | 2785 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 2913 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 82% | 55,999 psi | 88% | 2890 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,043 psi | 88% | 2884 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,840 psi | 89% | 3028 fps | 99.9% |
| ADI AR 2225 | <<locked>> | 92% | 56,217 psi | 88% | 2910 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,623 psi | 89% | 2884 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,201 psi | 87% | 2785 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,246 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,781 psi | 86% | 2933 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,230 psi | 87% | 2933 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,912 psi | 88% | 2858 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 56,275 psi | 88% | 2877 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,101 psi | 88% | 2897 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,623 psi | 89% | 2884 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,421 psi | 90% | 2900 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,116 psi | 90% | 2861 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,391 psi | 88% | 2966 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1841 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,435 psi | 90% | 2917 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 82% | 54,839 psi | 86% | 2877 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,623 psi | 89% | 2818 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,230 psi | 87% | 2900 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 54,375 psi | 85% | 2815 fps | 96.3% |
| Lovex S071 | <<locked>> | 86% | 55,013 psi | 86% | 2766 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,971 psi | 89% | 2920 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,478 psi | 89% | 2904 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,231 psi | 88% | 2953 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 84% | 54,882 psi | 86% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,421 psi | 62% | 1886 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 56,913 psi | 89% | 2946 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,985 psi | 88% | 2930 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,375 psi | 85% | 2815 fps | 96.3% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,578 psi | 86% | 2858 fps | 98.9% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,764 psi | 81% | 2835 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 84% | 57,000 psi | 89% | 2808 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,550 psi | 89% | 2858 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 84% | 54,085 psi | 85% | 2854 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,246 psi | 88% | 2933 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 54,128 psi | 85% | 2943 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,913 psi | 89% | 2881 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,318 psi | 88% | 2815 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% | 52,750 psi | 83% | 2733 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,465 psi | 62% | 2602 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 80% | 52,301 psi | 82% | 2831 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,537 psi | 62% | 2598 fps | 99.3% |
| ADI AR 2218 | 84.5 gr | 84% | 39,146 psi | 61% | 2677 fps | 96.3% |
| ADI AR 2225 | <<locked>> | 80% | 36,854 psi | 58% | 2575 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,011 psi | 83% | 2828 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,634 psi | 81% | 2733 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,963 psi | 72% | 2710 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 37,869 psi | 59% | 2602 fps | 95.6% |
| Alliant Reloder-50 | 85.8 gr | 84% | 38,319 psi | 60% | 2605 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,081 psi | 77% | 2743 fps | 98.9% |
| Bofors RP15 | <<locked>> | 80% | 49,487 psi | 78% | 2769 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,946 psi | 67% | 2674 fps | 99.7% |
| Bofors RP5 | <<locked>> | 80% | 53,011 psi | 83% | 2828 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,047 psi | 67% | 2667 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,432 psi | 84% | 2805 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,455 psi | 71% | 2792 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,819 psi | 45% | 1650 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,534 psi | 84% | 2851 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 80% | 51,198 psi | 80% | 2818 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 46,702 psi | 73% | 2648 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,345 psi | 54% | 2500 fps | 97.8% |
| Lovex D100 | <<locked>> | 88% | 50,749 psi | 80% | 2753 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 45,629 psi | 72% | 2618 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,085 psi | 55% | 2526 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 52,417 psi | 82% | 2841 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,388 psi | 82% | 2887 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 80% | 47,355 psi | 74% | 2713 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,689 psi | 47% | 1690 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,237 psi | 71% | 2766 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,568 psi | 65% | 2674 fps | 98.7% |
| Shooters World 50 BMG | <<locked>> | 88% | 50,749 psi | 80% | 2753 fps | 95.4% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 38,769 psi | 61% | 2562 fps | 95% |
| Vihtavuori 20N29 | <<locked>> | 96% | 44,846 psi | 70% | 2707 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 80% | 49,995 psi | 78% | 2707 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,207 psi | 68% | 2621 fps | 96% |
| Vihtavuori N565 | <<locked>> | 80% | 47,239 psi | 74% | 2740 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 42,424 psi | 66% | 2687 fps | 98.4% |
| Vihtavuori N570 | 78.9 gr | 80% | 40,625 psi | 64% | 2680 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,794 psi | 83% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,692 psi | 83% | 2762 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 42 powders for 7 mm KM Katzmaier loaded with the .284 | 183gr | Sierra MatchKing. ADI AR 2218 delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,028 fps. Accurate 8700 gives the best case fill at 100 %, and 42 of the 42 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 183.0 gr projectile in 0.284" calls for a 1:8.5 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 | 183gr | 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.