Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | Swift A-Frame 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% | 56,405 psi | 88% | 2841 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,029 psi | 89% | 2966 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 55,970 psi | 88% | 2946 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,086 psi | 88% | 2940 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,884 psi | 89% | 3084 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 56,289 psi | 88% | 2966 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,623 psi | 89% | 2940 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,158 psi | 86% | 2841 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,289 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,984 psi | 86% | 2986 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,477 psi | 87% | 2989 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,985 psi | 88% | 2913 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 56,231 psi | 88% | 2933 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,202 psi | 88% | 2953 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,623 psi | 89% | 2940 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,276 psi | 90% | 2953 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,101 psi | 89% | 2920 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,362 psi | 88% | 3022 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1893 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,653 psi | 90% | 2969 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 82% | 54,853 psi | 86% | 2936 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,753 psi | 89% | 2874 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,332 psi | 87% | 2956 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 54,418 psi | 85% | 2867 fps | 96% |
| Lovex S071 | <<locked>> | 86% | 55,056 psi | 86% | 2822 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,043 psi | 89% | 2976 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,347 psi | 88% | 2956 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,289 psi | 88% | 3005 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 84% | 54,752 psi | 86% | 2884 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,334 psi | 62% | 1936 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,000 psi | 89% | 3002 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,057 psi | 88% | 2986 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,418 psi | 85% | 2867 fps | 96% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,636 psi | 86% | 2910 fps | 98.7% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,822 psi | 81% | 2881 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 84% | 56,927 psi | 89% | 2864 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,449 psi | 88% | 2910 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 84% | 54,099 psi | 85% | 2907 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,304 psi | 88% | 2986 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 54,041 psi | 85% | 2992 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,956 psi | 89% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,478 psi | 89% | 2874 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% | 52,678 psi | 83% | 2785 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,595 psi | 62% | 2648 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 80% | 52,388 psi | 82% | 2887 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,508 psi | 62% | 2648 fps | 99% |
| ADI AR 2218 | 87.2 gr | 84% | 39,160 psi | 61% | 2723 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 36,796 psi | 58% | 2621 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,098 psi | 83% | 2884 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,677 psi | 81% | 2792 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,963 psi | 72% | 2762 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 37,840 psi | 59% | 2644 fps | 95.1% |
| Alliant Reloder-50 | 90.7 gr | 86% | 41,379 psi | 65% | 2717 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,994 psi | 77% | 2795 fps | 98.6% |
| Bofors RP15 | <<locked>> | 80% | 49,472 psi | 78% | 2825 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,917 psi | 67% | 2720 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 53,098 psi | 83% | 2884 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,105 psi | 68% | 2720 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,505 psi | 84% | 2864 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,353 psi | 71% | 2841 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 45% | 1693 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,679 psi | 84% | 2904 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 80% | 51,111 psi | 80% | 2874 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 46,775 psi | 73% | 2700 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,360 psi | 54% | 2543 fps | 97.4% |
| Lovex D100 | <<locked>> | 88% | 50,705 psi | 79% | 2802 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 45,600 psi | 71% | 2674 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,056 psi | 55% | 2572 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 52,388 psi | 82% | 2897 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,533 psi | 82% | 2940 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 47,268 psi | 74% | 2766 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,617 psi | 46% | 1732 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,281 psi | 71% | 2818 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,539 psi | 65% | 2720 fps | 98.4% |
| Shooters World 50 BMG | <<locked>> | 88% | 50,705 psi | 79% | 2802 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,684 psi | 65% | 2671 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,063 psi | 71% | 2756 fps | 95% |
| Vihtavuori N165 | <<locked>> | 80% | 49,951 psi | 78% | 2759 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,163 psi | 68% | 2671 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 80% | 47,253 psi | 74% | 2789 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 42,366 psi | 66% | 2730 fps | 98.1% |
| Vihtavuori N570 | 81.4 gr | 80% | 40,553 psi | 64% | 2723 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,953 psi | 83% | 2881 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,736 psi | 83% | 2818 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 | 175gr | Swift A-Frame. ADI AR 2218 delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,084 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 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 | Swift A-Frame 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.