Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 174gr | Prvi Partizan SP bullet and 41 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% | 56,724 psi | 89% | 2854 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 53,693 psi | 84% | 2920 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 82% | 56,507 psi | 89% | 2963 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,739 psi | 89% | 2956 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 57,624 psi | 90% | 3100 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 56,927 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,130 psi | 90% | 2956 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,695 psi | 87% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,797 psi | 89% | 2940 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,506 psi | 87% | 3002 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,144 psi | 88% | 3005 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,333 psi | 88% | 2927 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 56,753 psi | 89% | 2949 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,681 psi | 89% | 2969 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,130 psi | 90% | 2956 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 53,940 psi | 85% | 2910 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,580 psi | 90% | 2933 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,927 psi | 89% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,319 psi | 60% | 1900 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,390 psi | 87% | 2953 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,116 psi | 90% | 2887 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,941 psi | 88% | 2972 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,042 psi | 86% | 2881 fps | 96.1% |
| Lovex S071 | <<locked>> | 86% | 55,579 psi | 87% | 2838 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,696 psi | 90% | 2992 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,884 psi | 89% | 2972 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,956 psi | 89% | 3022 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 84% | 55,390 psi | 87% | 2897 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,349 psi | 62% | 1946 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,667 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,652 psi | 89% | 3002 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,042 psi | 86% | 2881 fps | 96.1% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,274 psi | 87% | 2927 fps | 98.8% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,576 psi | 82% | 2900 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 84% | 57,392 psi | 90% | 2877 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,942 psi | 89% | 2923 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 84% | 54,723 psi | 86% | 2923 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,913 psi | 89% | 3002 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 54,665 psi | 86% | 3009 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,580 psi | 90% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,898 psi | 89% | 2887 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% | 53,214 psi | 83% | 2802 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,059 psi | 63% | 2664 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 80% | 52,721 psi | 83% | 2904 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,856 psi | 62% | 2657 fps | 99.1% |
| ADI AR 2218 | 88.3 gr | 84% | 39,668 psi | 62% | 2740 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 37,260 psi | 58% | 2638 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,432 psi | 84% | 2897 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,069 psi | 82% | 2805 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,325 psi | 73% | 2776 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,261 psi | 60% | 2661 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 86% | 41,887 psi | 66% | 2733 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,371 psi | 77% | 2808 fps | 98.7% |
| Bofors RP15 | <<locked>> | 80% | 49,792 psi | 78% | 2838 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,410 psi | 68% | 2740 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 53,432 psi | 84% | 2897 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,453 psi | 68% | 2730 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,853 psi | 84% | 2874 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,963 psi | 72% | 2858 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 45% | 1699 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,634 psi | 81% | 2890 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,007 psi | 74% | 2710 fps | 95.1% |
| IMR 8133 Enduron | 77.2 gr | 80% | 34,679 psi | 54% | 2556 fps | 97.5% |
| Lovex D100 | <<locked>> | 88% | 51,329 psi | 80% | 2818 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 45,992 psi | 72% | 2687 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,418 psi | 56% | 2582 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 52,924 psi | 83% | 2913 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 53,011 psi | 83% | 2956 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 80% | 47,747 psi | 75% | 2779 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,602 psi | 46% | 1742 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,934 psi | 72% | 2835 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,959 psi | 66% | 2733 fps | 98.5% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,329 psi | 80% | 2818 fps | 95.2% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,148 psi | 66% | 2684 fps | 95.8% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,629 psi | 72% | 2772 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 80% | 50,415 psi | 79% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,555 psi | 68% | 2684 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 80% | 47,747 psi | 75% | 2802 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 42,830 psi | 67% | 2746 fps | 98.2% |
| Vihtavuori N570 | 82.4 gr | 80% | 41,031 psi | 64% | 2740 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,417 psi | 84% | 2894 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,200 psi | 83% | 2831 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 41 powders for 7 mm KM Katzmaier loaded with the .284 | 174gr | Prvi Partizan SP. ADI AR 2218 delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,900 fps to 3,100 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 41 of the 41 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 174.0 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 | 174gr | Prvi Partizan SP 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.