Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | Barnes Solid RN 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% | 56,057 psi | 88% | 2835 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 2963 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 55,825 psi | 87% | 2946 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% | 55,970 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,463 psi | 88% | 2936 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 54,955 psi | 86% | 2841 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 55,912 psi | 88% | 2920 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,665 psi | 86% | 2982 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,129 psi | 86% | 2982 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,695 psi | 87% | 2910 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 56,057 psi | 88% | 2933 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 55,869 psi | 88% | 2949 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,463 psi | 88% | 2936 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,101 psi | 89% | 2953 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 56,942 psi | 89% | 2917 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,188 psi | 88% | 3022 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1890 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,406 psi | 90% | 2966 fps | 96.2% |
| IMR 4955 Enduron | <<locked>> | 82% | 57,711 psi | 90% | 2904 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 54,694 psi | 86% | 2933 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,449 psi | 88% | 2867 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 54,984 psi | 86% | 2953 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 54,897 psi | 86% | 2822 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,695 psi | 89% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,159 psi | 88% | 2953 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,014 psi | 88% | 2999 fps | 96% |
| Ramshot Magnum | <<locked>> | 84% | 54,592 psi | 86% | 2881 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,378 psi | 62% | 1936 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 56,826 psi | 89% | 3002 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,767 psi | 87% | 2979 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,375 psi | 85% | 2907 fps | 98.7% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,576 psi | 81% | 2877 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 84% | 56,768 psi | 89% | 2864 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,347 psi | 88% | 2910 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 86% | 57,696 psi | 90% | 2963 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 55,985 psi | 88% | 2982 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 53,882 psi | 84% | 2989 fps | 99% |
| 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% | 52,547 psi | 82% | 2785 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,334 psi | 62% | 2641 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 80% | 52,025 psi | 82% | 2884 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,204 psi | 61% | 2641 fps | 99% |
| ADI AR 2218 | 86.9 gr | 84% | 39,044 psi | 61% | 2717 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 36,622 psi | 57% | 2618 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 52,750 psi | 83% | 2881 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,503 psi | 81% | 2789 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,759 psi | 72% | 2759 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 37,724 psi | 59% | 2644 fps | 95% |
| Alliant Reloder-50 | 90.3 gr | 86% | 41,118 psi | 64% | 2713 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,892 psi | 77% | 2792 fps | 98.6% |
| Bofors RP15 | <<locked>> | 80% | 49,124 psi | 77% | 2818 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,728 psi | 67% | 2720 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 52,750 psi | 83% | 2881 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 42,772 psi | 67% | 2713 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,185 psi | 83% | 2858 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,150 psi | 71% | 2838 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,790 psi | 45% | 1693 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,447 psi | 84% | 2897 fps | 95.2% |
| IMR 4955 Enduron | <<locked>> | 80% | 54,244 psi | 85% | 2848 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 50,937 psi | 80% | 2871 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 84% | 49,734 psi | 78% | 2753 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,185 psi | 54% | 2539 fps | 97.3% |
| Lovex S071 | <<locked>> | 80% | 45,440 psi | 71% | 2671 fps | 100% |
| Norma 217 | <<locked>> | 80% | 34,882 psi | 55% | 2566 fps | 99.2% |
| Ramshot Grand | <<locked>> | 80% | 52,199 psi | 82% | 2894 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,257 psi | 82% | 2936 fps | 95% |
| Ramshot Magnum | <<locked>> | 80% | 47,137 psi | 74% | 2762 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,631 psi | 46% | 1732 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,092 psi | 71% | 2815 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,394 psi | 65% | 2717 fps | 98.3% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,452 psi | 65% | 2664 fps | 95.5% |
| Vihtavuori 20N29 | <<locked>> | 98% | 48,066 psi | 75% | 2815 fps | 95.9% |
| Vihtavuori N165 | <<locked>> | 80% | 49,777 psi | 78% | 2756 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,047 psi | 67% | 2667 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 80% | 47,108 psi | 74% | 2785 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 80% | 42,206 psi | 66% | 2726 fps | 98.1% |
| Vihtavuori N570 | 81.1 gr | 80% | 40,393 psi | 63% | 2723 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,533 psi | 82% | 2877 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,576 psi | 82% | 2815 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 | Barnes Solid RN. 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 1:10.5 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 | 175gr | Barnes Solid RN 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.