Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 170gr | SUS-TAC HPT bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Hodgdon Retumbo and Vihtavuori N570.
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>> | 84% | 56,246 psi | 88% | 2874 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2920 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 82% | 55,288 psi | 87% | 2989 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 56,971 psi | 89% | 2959 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,825 psi | 87% | 2982 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,434 psi | 87% | 2969 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 55,811 psi | 87% | 3100 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 94% | 54,998 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,550 psi | 89% | 2949 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,405 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,911 psi | 86% | 2877 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,521 psi | 87% | 2956 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 53,824 psi | 84% | 3009 fps | 98.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,143 psi | 85% | 3005 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,014 psi | 88% | 2946 fps | 99.3% |
| Bofors RP15 | <<locked>> | 86% | 55,840 psi | 88% | 2966 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,376 psi | 87% | 2982 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,405 psi | 88% | 2976 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,811 psi | 89% | 2986 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,404 psi | 85% | 2910 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,203 psi | 90% | 2953 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,216 psi | 87% | 3051 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1896 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,636 psi | 86% | 2887 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 54,520 psi | 85% | 2966 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,826 psi | 89% | 2897 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,172 psi | 85% | 2979 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 54,665 psi | 86% | 2851 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,680 psi | 87% | 3002 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,594 psi | 89% | 2986 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,970 psi | 88% | 2992 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,230 psi | 85% | 2913 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,073 psi | 61% | 1942 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 55,956 psi | 88% | 3035 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 54,998 psi | 86% | 3009 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 57,087 psi | 89% | 2927 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,420 psi | 88% | 2940 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 2927 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,072 psi | 88% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,637 psi | 89% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,797 psi | 89% | 2900 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,304 psi | 88% | 2936 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 82% | 56,449 psi | 88% | 2904 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,854 psi | 88% | 2995 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 57,392 psi | 90% | 2995 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,434 psi | 87% | 3012 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 92% | 57,014 psi | 89% | 3084 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,854 psi | 88% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,420 psi | 88% | 2907 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% | 49,110 psi | 77% | 2769 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 41,437 psi | 65% | 2723 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 80% | 51,474 psi | 81% | 2927 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 80% | 53,200 psi | 83% | 2900 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,501 psi | 76% | 2858 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 80% | 36,318 psi | 57% | 2608 fps | 97.8% |
| ADI AR 2218 | 87.1 gr | 88% | 41,553 psi | 65% | 2812 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 33,649 psi | 53% | 2582 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,924 psi | 83% | 2894 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,240 psi | 77% | 2858 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,051 psi | 75% | 2776 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,206 psi | 66% | 2740 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 40,001 psi | 63% | 2733 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 90% | 43,381 psi | 68% | 2802 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,050 psi | 72% | 2766 fps | 97.5% |
| Bofors RP15 | <<locked>> | 80% | 45,905 psi | 72% | 2799 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 39,436 psi | 62% | 2687 fps | 98.6% |
| Bofors RP5 | <<locked>> | 80% | 49,240 psi | 77% | 2858 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,668 psi | 62% | 2687 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 80% | 50,821 psi | 80% | 2851 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,922 psi | 78% | 2835 fps | 99.6% |
| Hodgdon Retumbo | 74.7 gr | 80% | 41,350 psi | 65% | 2805 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,529 psi | 45% | 1696 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,198 psi | 80% | 2831 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 47,500 psi | 74% | 2844 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 86% | 49,922 psi | 78% | 2782 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,285 psi | 49% | 2500 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 42,453 psi | 67% | 2651 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,763 psi | 50% | 2530 fps | 98% |
| Norma MRP | <<locked>> | 80% | 52,837 psi | 83% | 2930 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,182 psi | 76% | 2864 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 43,555 psi | 68% | 2736 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1739 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,046 psi | 64% | 2782 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,695 psi | 59% | 2674 fps | 96.8% |
| Rottweil R 904 | <<locked>> | 80% | 53,606 psi | 84% | 2874 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 52,895 psi | 83% | 2887 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 43,598 psi | 68% | 2743 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,562 psi | 82% | 2884 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,011 psi | 83% | 2854 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,630 psi | 73% | 2736 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 46,035 psi | 72% | 2756 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 52,982 psi | 83% | 2854 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,214 psi | 82% | 2933 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 43,816 psi | 69% | 2759 fps | 99% |
| Vihtavuori N568 | <<locked>> | 80% | 38,841 psi | 61% | 2690 fps | 96.6% |
| Vihtavuori N570 | 81.5 gr | 84% | 42,859 psi | 67% | 2815 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,167 psi | 75% | 2858 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,182 psi | 77% | 2795 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 49 powders for 7 mm KM Katzmaier loaded with the .284 | 170gr | SUS-TAC HPT. ADI AR 2218 delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,100 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 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 170.0 gr projectile in 0.284" calls for a 1:7.5 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, Hodgdon Retumbo, Vihtavuori N570 rank at the top here: for 7 mm KM Katzmaier with the .284 | 170gr | SUS-TAC HPT 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.