Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | Speer Magnum Tip Soft Point bullet and 36 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% | 57,464 psi | 90% | 2854 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 54,549 psi | 85% | 2927 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 82% | 57,290 psi | 90% | 2966 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,522 psi | 90% | 2959 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 54,346 psi | 85% | 3038 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 90% | 53,882 psi | 84% | 2927 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 56,304 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,595 psi | 90% | 2940 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 56,434 psi | 88% | 3009 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 57,232 psi | 90% | 3015 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,956 psi | 89% | 2930 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 57,479 psi | 90% | 2953 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,595 psi | 90% | 2976 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,752 psi | 86% | 2917 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 53,867 psi | 84% | 2982 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,232 psi | 60% | 1896 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,999 psi | 88% | 2953 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,725 psi | 90% | 2894 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,739 psi | 89% | 2976 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,825 psi | 87% | 2890 fps | 96.4% |
| Lovex S071 | <<locked>> | 86% | 56,144 psi | 88% | 2838 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,621 psi | 86% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,740 psi | 90% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 56,144 psi | 88% | 2900 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,407 psi | 62% | 1942 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 54,317 psi | 85% | 2963 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,595 psi | 90% | 3009 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,825 psi | 87% | 2890 fps | 96.4% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 56,101 psi | 88% | 2933 fps | 99% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 53,417 psi | 84% | 2907 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 82% | 54,389 psi | 85% | 2828 fps | 100% |
| Vihtavuori N170 | <<locked>> | 86% | 53,998 psi | 85% | 2871 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 84% | 55,463 psi | 87% | 2930 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,653 psi | 90% | 3005 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 55,608 psi | 87% | 3015 fps | 99.2% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,624 psi | 90% | 2890 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% | 53,766 psi | 84% | 2805 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,683 psi | 64% | 2671 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 80% | 53,476 psi | 84% | 2907 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,379 psi | 63% | 2664 fps | 99.2% |
| ADI AR 2218 | 86.9 gr | 82% | 37,420 psi | 59% | 2674 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 37,797 psi | 59% | 2641 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,823 psi | 83% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 47,065 psi | 74% | 2779 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,899 psi | 61% | 2667 fps | 95.6% |
| Alliant Reloder-50 | 90.4 gr | 84% | 39,610 psi | 62% | 2674 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,980 psi | 78% | 2812 fps | 98.8% |
| Bofors RP15 | <<locked>> | 80% | 50,372 psi | 79% | 2841 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,932 psi | 69% | 2740 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 44,193 psi | 69% | 2740 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,615 psi | 73% | 2861 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 45% | 1699 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 52,257 psi | 82% | 2894 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,587 psi | 75% | 2717 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,331 psi | 55% | 2566 fps | 97.8% |
| Lovex D100 | <<locked>> | 88% | 51,924 psi | 81% | 2825 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 46,528 psi | 73% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 36,114 psi | 57% | 2592 fps | 99.5% |
| Ramshot Grand | <<locked>> | 80% | 53,766 psi | 84% | 2920 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 48,472 psi | 76% | 2785 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,602 psi | 46% | 1739 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,731 psi | 73% | 2841 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,641 psi | 67% | 2740 fps | 98.7% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,924 psi | 81% | 2825 fps | 95.5% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 39,987 psi | 63% | 2631 fps | 95.1% |
| Vihtavuori 20N29 | <<locked>> | 96% | 46,412 psi | 73% | 2779 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 80% | 50,952 psi | 80% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 44,150 psi | 69% | 2690 fps | 96% |
| Vihtavuori N565 | <<locked>> | 80% | 48,443 psi | 76% | 2808 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 43,526 psi | 68% | 2756 fps | 98.5% |
| Vihtavuori N570 | 83.1 gr | 80% | 41,713 psi | 65% | 2746 fps | 96.1% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,722 psi | 84% | 2835 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 36 powders for 7 mm KM Katzmaier loaded with the .284 | 175gr | Speer Magnum Tip Soft Point. ADI AR 2218 delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,038 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 36 of the 36 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 1:12.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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 | Speer Magnum Tip Soft Point 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.