Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 170gr | Hammer HHT bullet and 50 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-33.
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% | 56,637 psi | 89% | 2881 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 2933 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 82% | 55,869 psi | 88% | 2999 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 82% | 57,377 psi | 90% | 2969 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,231 psi | 88% | 2989 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,811 psi | 87% | 2976 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,507 psi | 89% | 3114 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 94% | 55,579 psi | 87% | 2999 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,522 psi | 90% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,942 psi | 89% | 2956 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,826 psi | 89% | 2982 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,332 psi | 87% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,130 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,534 psi | 85% | 3018 fps | 99.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,839 psi | 86% | 3018 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,289 psi | 88% | 2949 fps | 99.3% |
| Bofors RP15 | <<locked>> | 86% | 56,405 psi | 88% | 2976 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,970 psi | 88% | 2989 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,826 psi | 89% | 2982 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,203 psi | 90% | 2992 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,955 psi | 86% | 2920 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,566 psi | 90% | 2959 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,883 psi | 88% | 3061 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,130 psi | 60% | 1903 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,013 psi | 86% | 2894 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 54,940 psi | 86% | 2976 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,276 psi | 90% | 2910 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,723 psi | 86% | 2989 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,274 psi | 87% | 2861 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,289 psi | 88% | 3009 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,188 psi | 90% | 2995 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,405 psi | 88% | 2999 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,824 psi | 86% | 2923 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,160 psi | 61% | 1946 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,565 psi | 89% | 3045 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,767 psi | 87% | 3022 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 57,479 psi | 90% | 2936 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,855 psi | 89% | 2949 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,215 psi | 85% | 2936 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,478 psi | 89% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,217 psi | 90% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,348 psi | 90% | 2907 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,768 psi | 89% | 2949 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 82% | 56,942 psi | 89% | 2910 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,478 psi | 89% | 3005 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 54,230 psi | 85% | 2946 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,985 psi | 88% | 3022 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 92% | 57,566 psi | 90% | 3091 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,565 psi | 89% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,956 psi | 89% | 2917 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% | 49,516 psi | 78% | 2776 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 42,018 psi | 66% | 2736 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 80% | 52,069 psi | 82% | 2933 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 80% | 53,621 psi | 84% | 2910 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,095 psi | 77% | 2871 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 36,680 psi | 57% | 2615 fps | 98% |
| ADI AR 2218 | 85.8 gr | 86% | 39,030 psi | 61% | 2749 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 33,982 psi | 53% | 2592 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,838 psi | 84% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,316 psi | 84% | 2900 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,850 psi | 78% | 2871 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,501 psi | 76% | 2782 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,627 psi | 67% | 2746 fps | 100% |
| Alliant Reloder-33 | 85.4 gr | 84% | 40,509 psi | 63% | 2746 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 88% | 40,799 psi | 64% | 2746 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,340 psi | 73% | 2776 fps | 97.7% |
| Bofors RP15 | <<locked>> | 80% | 46,296 psi | 73% | 2805 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 39,813 psi | 62% | 2694 fps | 98.7% |
| Bofors RP5 | <<locked>> | 80% | 49,850 psi | 78% | 2871 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,074 psi | 63% | 2694 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 80% | 51,184 psi | 80% | 2858 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,473 psi | 79% | 2844 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 80% | 41,785 psi | 65% | 2815 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,689 psi | 45% | 1703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,561 psi | 81% | 2838 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 47,921 psi | 75% | 2858 fps | 99.7% |
| IMR 7977 Enduron | <<locked>> | 86% | 50,386 psi | 79% | 2792 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,662 psi | 50% | 2510 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 42,859 psi | 67% | 2657 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,155 psi | 50% | 2539 fps | 98.2% |
| Norma MRP | <<locked>> | 80% | 53,258 psi | 83% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,617 psi | 76% | 2874 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 43,947 psi | 69% | 2746 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,385 psi | 46% | 1742 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,466 psi | 65% | 2789 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,232 psi | 60% | 2684 fps | 97.1% |
| Rottweil R 904 | <<locked>> | 80% | 54,012 psi | 85% | 2881 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 53,316 psi | 84% | 2894 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 41,278 psi | 65% | 2697 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,982 psi | 83% | 2890 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,606 psi | 84% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,992 psi | 74% | 2743 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 43,395 psi | 68% | 2703 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 53,447 psi | 84% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,605 psi | 82% | 2943 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 44,222 psi | 69% | 2766 fps | 99.1% |
| Vihtavuori N568 | <<locked>> | 80% | 39,218 psi | 61% | 2700 fps | 96.8% |
| Vihtavuori N570 | 80.2 gr | 82% | 40,292 psi | 63% | 2756 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,733 psi | 76% | 2867 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,734 psi | 78% | 2805 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 50 powders for 7 mm KM Katzmaier loaded with the .284 | 170gr | Hammer HHT. ADI AR 2218 delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,114 fps. Accurate 8700 gives the best case fill at 100 %, and 50 of the 50 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 1:8.0 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-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 170gr | Hammer HHT 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.