Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 174gr | Prvi Partizan FMJ BT 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 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 56,971 psi | 89% | 2858 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 54,041 psi | 85% | 2927 fps | 99% |
| ADI AR 2213 | <<locked>> | 82% | 56,768 psi | 89% | 2966 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,000 psi | 89% | 2959 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 53,824 psi | 84% | 3035 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 92% | 57,392 psi | 90% | 2986 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,406 psi | 90% | 2959 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,970 psi | 88% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,058 psi | 89% | 2940 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,927 psi | 88% | 3009 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,536 psi | 89% | 3012 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,521 psi | 89% | 2930 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 57,000 psi | 89% | 2953 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,101 psi | 89% | 2976 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,406 psi | 90% | 2959 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,215 psi | 85% | 2917 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,450 psi | 90% | 3045 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,218 psi | 60% | 1903 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,680 psi | 87% | 2956 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,319 psi | 90% | 2894 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,188 psi | 88% | 2976 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,390 psi | 87% | 2890 fps | 96.3% |
| Lovex S071 | <<locked>> | 86% | 55,840 psi | 88% | 2841 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,273 psi | 85% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,363 psi | 90% | 2979 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,334 psi | 90% | 3031 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 84% | 55,651 psi | 87% | 2904 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,407 psi | 62% | 1949 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,954 psi | 85% | 2963 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,058 psi | 89% | 3005 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,390 psi | 87% | 2890 fps | 96.3% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,637 psi | 87% | 2933 fps | 98.9% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 2907 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 84% | 57,609 psi | 90% | 2884 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,334 psi | 90% | 2933 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 84% | 54,969 psi | 86% | 2930 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,334 psi | 90% | 3009 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 55,085 psi | 86% | 3015 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,174 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% | 53,476 psi | 84% | 2808 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,393 psi | 63% | 2671 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 80% | 52,997 psi | 83% | 2907 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,103 psi | 63% | 2664 fps | 99.2% |
| ADI AR 2218 | 88.8 gr | 84% | 39,987 psi | 63% | 2746 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 37,507 psi | 59% | 2641 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,693 psi | 84% | 2904 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,359 psi | 82% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,601 psi | 73% | 2782 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,624 psi | 61% | 2667 fps | 95.4% |
| Alliant Reloder-50 | 92.3 gr | 86% | 42,264 psi | 66% | 2743 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,763 psi | 78% | 2815 fps | 98.8% |
| Bofors RP15 | <<locked>> | 80% | 50,067 psi | 78% | 2841 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,656 psi | 68% | 2743 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 53,693 psi | 84% | 2904 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,714 psi | 69% | 2736 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,267 psi | 73% | 2861 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,732 psi | 45% | 1703 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,953 psi | 81% | 2894 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,369 psi | 74% | 2717 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,925 psi | 55% | 2562 fps | 97.6% |
| Lovex D100 | <<locked>> | 88% | 51,503 psi | 81% | 2822 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 46,122 psi | 72% | 2690 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,679 psi | 56% | 2589 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 53,243 psi | 83% | 2917 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 53,388 psi | 84% | 2959 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 80% | 48,182 psi | 76% | 2785 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,704 psi | 47% | 1745 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,224 psi | 72% | 2838 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,337 psi | 66% | 2740 fps | 98.5% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,503 psi | 81% | 2822 fps | 95.3% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,351 psi | 66% | 2690 fps | 95.9% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,963 psi | 72% | 2779 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 80% | 50,662 psi | 79% | 2779 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,787 psi | 69% | 2687 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 80% | 48,008 psi | 75% | 2808 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 43,062 psi | 67% | 2753 fps | 98.3% |
| Vihtavuori N570 | 82.8 gr | 80% | 41,292 psi | 65% | 2746 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,447 psi | 84% | 2838 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 39 powders for 7 mm KM Katzmaier loaded with the .284 | 174gr | Prvi Partizan FMJ BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,045 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 39 of the 39 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 1:12.0 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 | 174gr | Prvi Partizan FMJ 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.