Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | Speer Deep Curl Soft Point bullet and 39 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 IMR 8133 Enduron.
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% | 57,058 psi | 89% | 2851 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 54,099 psi | 85% | 2920 fps | 99% |
| ADI AR 2213 | <<locked>> | 82% | 56,869 psi | 89% | 2963 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,942 psi | 89% | 2953 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 53,795 psi | 84% | 3028 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 92% | 57,348 psi | 90% | 2979 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,464 psi | 90% | 2953 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,869 psi | 88% | 2851 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,145 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,927 psi | 88% | 3002 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,536 psi | 89% | 3002 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,623 psi | 89% | 2923 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 57,087 psi | 89% | 2949 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,029 psi | 89% | 2966 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,464 psi | 90% | 2953 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,331 psi | 85% | 2910 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,363 psi | 90% | 3035 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1896 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,579 psi | 87% | 2946 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,421 psi | 90% | 2887 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,144 psi | 88% | 2969 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,201 psi | 87% | 2881 fps | 96.2% |
| Lovex S071 | <<locked>> | 86% | 55,738 psi | 87% | 2831 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,201 psi | 85% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,261 psi | 90% | 2969 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,348 psi | 90% | 3022 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 84% | 55,782 psi | 87% | 2897 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,320 psi | 62% | 1939 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,925 psi | 85% | 2956 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,043 psi | 89% | 2999 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,201 psi | 87% | 2881 fps | 96.2% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,651 psi | 87% | 2927 fps | 98.9% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 2900 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 84% | 57,711 psi | 90% | 2877 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,276 psi | 90% | 2923 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 84% | 54,897 psi | 86% | 2920 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,276 psi | 90% | 2999 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 55,042 psi | 86% | 3009 fps | 99.2% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,058 psi | 89% | 2884 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% | 53,359 psi | 84% | 2799 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,364 psi | 63% | 2664 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 80% | 53,055 psi | 83% | 2900 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,147 psi | 63% | 2661 fps | 99.2% |
| ADI AR 2218 | 88.4 gr | 84% | 39,943 psi | 63% | 2743 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 37,420 psi | 59% | 2635 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,751 psi | 84% | 2894 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,402 psi | 82% | 2802 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,630 psi | 73% | 2776 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,551 psi | 60% | 2661 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 84% | 39,131 psi | 61% | 2664 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,676 psi | 78% | 2808 fps | 98.8% |
| Bofors RP15 | <<locked>> | 80% | 50,125 psi | 79% | 2835 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,555 psi | 68% | 2733 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 53,751 psi | 84% | 2894 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,787 psi | 69% | 2733 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,122 psi | 72% | 2851 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,761 psi | 45% | 1696 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,996 psi | 81% | 2887 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,268 psi | 74% | 2710 fps | 95.3% |
| IMR 8133 Enduron | 77.3 gr | 80% | 34,954 psi | 55% | 2556 fps | 97.6% |
| Lovex D100 | <<locked>> | 88% | 51,488 psi | 81% | 2818 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 46,122 psi | 72% | 2680 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,723 psi | 56% | 2585 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 53,301 psi | 84% | 2910 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 53,403 psi | 84% | 2953 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 80% | 48,095 psi | 75% | 2779 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,588 psi | 46% | 1736 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,137 psi | 72% | 2828 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,293 psi | 66% | 2733 fps | 98.6% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,488 psi | 81% | 2818 fps | 95.3% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,322 psi | 66% | 2684 fps | 95.9% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,803 psi | 72% | 2769 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 80% | 50,575 psi | 79% | 2769 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,685 psi | 68% | 2680 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 80% | 48,051 psi | 75% | 2805 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 43,134 psi | 68% | 2746 fps | 98.3% |
| Vihtavuori N570 | 82.4 gr | 80% | 41,205 psi | 65% | 2740 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,330 psi | 84% | 2828 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 | Speer Deep Curl Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,035 fps. Hodgdon TrailBoss 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 1:11.5 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, IMR 8133 Enduron rank at the top here: for 7 mm KM Katzmaier with the .284 | 175gr | Speer Deep Curl Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.