Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 180gr | Berger BT Target 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.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 57,029 psi | 89% | 2815 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 54,128 psi | 85% | 2890 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 82% | 56,884 psi | 89% | 2927 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,145 psi | 90% | 2923 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 53,911 psi | 84% | 2999 fps | 99.7% |
| ADI AR 2225 | <<locked>> | 92% | 57,290 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,493 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,999 psi | 88% | 2818 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,261 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,970 psi | 88% | 2972 fps | 99.6% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,536 psi | 89% | 2976 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,608 psi | 89% | 2890 fps | 99.7% |
| Bofors RP15 | <<locked>> | 84% | 57,116 psi | 90% | 2913 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,232 psi | 90% | 2936 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,493 psi | 90% | 2917 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,273 psi | 85% | 2877 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,508 psi | 90% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1867 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,767 psi | 87% | 2917 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,377 psi | 90% | 2854 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,260 psi | 88% | 2936 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,245 psi | 87% | 2848 fps | 96.5% |
| Lovex S071 | <<locked>> | 86% | 55,883 psi | 88% | 2799 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,273 psi | 85% | 2900 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,348 psi | 90% | 2940 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,290 psi | 90% | 2989 fps | 96.6% |
| Ramshot Magnum | <<locked>> | 84% | 55,767 psi | 87% | 2864 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,349 psi | 62% | 1909 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,983 psi | 85% | 2927 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,087 psi | 89% | 2966 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,245 psi | 87% | 2848 fps | 96.5% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,593 psi | 87% | 2894 fps | 99.1% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,866 psi | 83% | 2871 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 84% | 57,740 psi | 90% | 2841 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,377 psi | 90% | 2894 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 84% | 55,027 psi | 86% | 2890 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,203 psi | 90% | 2966 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 55,158 psi | 86% | 2979 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,290 psi | 90% | 2851 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% | 53,461 psi | 84% | 2766 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,364 psi | 63% | 2638 fps | 96% |
| ADI AR 2213 | <<locked>> | 80% | 53,011 psi | 83% | 2867 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,219 psi | 63% | 2631 fps | 99.3% |
| ADI AR 2218 | 84.7 gr | 82% | 37,086 psi | 58% | 2641 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 37,521 psi | 59% | 2605 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,708 psi | 84% | 2861 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,475 psi | 82% | 2769 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,746 psi | 73% | 2743 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,667 psi | 61% | 2638 fps | 95.8% |
| Alliant Reloder-50 | 88.1 gr | 84% | 39,189 psi | 61% | 2641 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,719 psi | 78% | 2776 fps | 98.9% |
| Bofors RP15 | <<locked>> | 80% | 50,227 psi | 79% | 2805 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,642 psi | 68% | 2703 fps | 99.7% |
| Bofors RP5 | <<locked>> | 80% | 53,708 psi | 84% | 2861 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,903 psi | 69% | 2703 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,282 psi | 73% | 2822 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,732 psi | 45% | 1667 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,953 psi | 81% | 2854 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,413 psi | 74% | 2680 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 80% | 35,041 psi | 55% | 2533 fps | 97.9% |
| Lovex D100 | <<locked>> | 88% | 51,634 psi | 81% | 2789 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 46,282 psi | 73% | 2651 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,824 psi | 56% | 2559 fps | 99.6% |
| Ramshot Grand | <<locked>> | 80% | 53,359 psi | 84% | 2877 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 53,461 psi | 84% | 2927 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 80% | 48,153 psi | 75% | 2749 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,733 psi | 47% | 1713 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,267 psi | 73% | 2802 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,395 psi | 66% | 2707 fps | 98.8% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,634 psi | 81% | 2789 fps | 95.6% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 39,552 psi | 62% | 2598 fps | 95.2% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,963 psi | 72% | 2746 fps | 95.6% |
| Vihtavuori N165 | <<locked>> | 80% | 50,676 psi | 79% | 2740 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,859 psi | 69% | 2654 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 80% | 48,066 psi | 75% | 2772 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 43,207 psi | 68% | 2720 fps | 98.6% |
| Vihtavuori N570 | 81 gr | 80% | 41,408 psi | 65% | 2713 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,490 psi | 84% | 2795 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 | 180gr | Berger BT Target. Hodgdon Retumbo delivers the highest muzzle velocity at 3,002 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,002 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 180.0 gr projectile in 0.284" calls for a 1:10.0 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 | 180gr | Berger BT Target 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.