Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 174gr | Prvi Partizan PSP BT 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-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>> | 82% | 56,347 psi | 88% | 2848 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2976 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 82% | 56,144 psi | 88% | 2956 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,188 psi | 88% | 2949 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,913 psi | 89% | 3091 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 56,405 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,753 psi | 89% | 2949 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,114 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,202 psi | 88% | 2933 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,027 psi | 86% | 2992 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,492 psi | 87% | 2992 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,883 psi | 88% | 2917 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 56,173 psi | 88% | 2940 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,289 psi | 88% | 2963 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,753 psi | 89% | 2949 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,392 psi | 90% | 2963 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,217 psi | 90% | 2930 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,507 psi | 89% | 3031 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,232 psi | 60% | 1896 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,638 psi | 90% | 2976 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 82% | 54,824 psi | 86% | 2943 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,652 psi | 89% | 2881 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,230 psi | 87% | 2963 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 54,476 psi | 85% | 2874 fps | 96% |
| Lovex S071 | <<locked>> | 86% | 55,027 psi | 86% | 2831 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,927 psi | 89% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,478 psi | 89% | 2966 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,318 psi | 88% | 3012 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 84% | 54,853 psi | 86% | 2894 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,276 psi | 62% | 1942 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,101 psi | 89% | 3012 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,144 psi | 88% | 2992 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,476 psi | 85% | 2874 fps | 96% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,665 psi | 86% | 2917 fps | 98.7% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,025 psi | 82% | 2890 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 84% | 56,855 psi | 89% | 2871 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,507 psi | 89% | 2917 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 84% | 54,201 psi | 85% | 2917 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,420 psi | 88% | 2995 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 54,099 psi | 85% | 2999 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,927 psi | 89% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,391 psi | 88% | 2881 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% | 52,649 psi | 83% | 2795 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,508 psi | 62% | 2651 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 80% | 52,330 psi | 82% | 2897 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,523 psi | 62% | 2651 fps | 99% |
| ADI AR 2218 | 87.6 gr | 84% | 39,247 psi | 62% | 2730 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 36,912 psi | 58% | 2628 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,040 psi | 83% | 2890 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,663 psi | 81% | 2799 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,919 psi | 72% | 2772 fps | 100% |
| Alliant Reloder-33 | 85 gr | 80% | 37,956 psi | 59% | 2654 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 86% | 41,437 psi | 65% | 2726 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,110 psi | 77% | 2802 fps | 98.6% |
| Bofors RP15 | <<locked>> | 80% | 49,429 psi | 77% | 2831 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,873 psi | 67% | 2726 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 53,040 psi | 83% | 2890 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,091 psi | 68% | 2726 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,476 psi | 84% | 2871 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,498 psi | 71% | 2851 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,776 psi | 45% | 1699 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,693 psi | 84% | 2910 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 80% | 51,256 psi | 80% | 2884 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 46,731 psi | 73% | 2703 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,345 psi | 54% | 2549 fps | 97.3% |
| Lovex D100 | <<locked>> | 88% | 50,734 psi | 80% | 2808 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 45,600 psi | 71% | 2677 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,056 psi | 55% | 2575 fps | 99.2% |
| Ramshot Grand | <<locked>> | 80% | 52,344 psi | 82% | 2904 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,591 psi | 82% | 2949 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 47,384 psi | 74% | 2776 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,617 psi | 46% | 1739 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,382 psi | 71% | 2825 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,626 psi | 65% | 2726 fps | 98.4% |
| Shooters World 50 BMG | <<locked>> | 88% | 50,734 psi | 80% | 2808 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,597 psi | 65% | 2674 fps | 95.5% |
| Vihtavuori 20N29 | <<locked>> | 98% | 48,356 psi | 76% | 2825 fps | 95.9% |
| Vihtavuori N165 | <<locked>> | 80% | 49,908 psi | 78% | 2766 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,120 psi | 68% | 2674 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 80% | 47,384 psi | 74% | 2799 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 42,467 psi | 67% | 2740 fps | 98.1% |
| Vihtavuori N570 | 81.7 gr | 80% | 40,524 psi | 64% | 2730 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,953 psi | 83% | 2890 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,678 psi | 83% | 2825 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 | 174gr | Prvi Partizan PSP BT. ADI AR 2218 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,091 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 174.0 gr projectile in 0.284" calls for a 1:11.0 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 | 174gr | Prvi Partizan PSP BT 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.