Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 180gr | Lapua ScenarL 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-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% | 56,347 psi | 88% | 2802 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 56,942 psi | 89% | 2933 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 82% | 55,956 psi | 88% | 2910 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,101 psi | 88% | 2907 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 56,869 psi | 89% | 3048 fps | 99.9% |
| ADI AR 2225 | <<locked>> | 92% | 56,231 psi | 88% | 2930 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,608 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,245 psi | 87% | 2805 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,362 psi | 88% | 2887 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 54,839 psi | 86% | 2949 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,463 psi | 87% | 2956 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,782 psi | 87% | 2874 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 56,231 psi | 88% | 2897 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,159 psi | 88% | 2917 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,608 psi | 89% | 2904 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,276 psi | 90% | 2920 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,087 psi | 89% | 2884 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,289 psi | 88% | 2986 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,232 psi | 60% | 1860 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,551 psi | 90% | 2936 fps | 96.4% |
| IMR 7828 SSC | <<locked>> | 82% | 54,824 psi | 86% | 2897 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,695 psi | 89% | 2838 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,259 psi | 87% | 2920 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 54,491 psi | 85% | 2835 fps | 96.2% |
| Lovex S071 | <<locked>> | 86% | 54,998 psi | 86% | 2785 fps | 100% |
| Norma 217 | <<locked>> | 94% | 56,956 psi | 89% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,391 psi | 88% | 2923 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,275 psi | 88% | 2972 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 84% | 54,737 psi | 86% | 2848 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,291 psi | 62% | 1903 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,116 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 55,883 psi | 88% | 2946 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,491 psi | 85% | 2835 fps | 96.2% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,607 psi | 86% | 2877 fps | 98.9% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 51,750 psi | 81% | 2851 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 84% | 56,927 psi | 89% | 2828 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,536 psi | 89% | 2877 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 84% | 54,186 psi | 85% | 2874 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,217 psi | 88% | 2949 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 54,114 psi | 85% | 2959 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,797 psi | 89% | 2900 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,463 psi | 88% | 2838 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% | 52,765 psi | 83% | 2753 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,581 psi | 62% | 2618 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 80% | 52,315 psi | 82% | 2854 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,407 psi | 62% | 2615 fps | 99.2% |
| ADI AR 2218 | 85.5 gr | 84% | 39,175 psi | 61% | 2694 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 36,869 psi | 58% | 2592 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,026 psi | 83% | 2848 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,706 psi | 81% | 2756 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,818 psi | 72% | 2726 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 37,797 psi | 59% | 2618 fps | 95.4% |
| Alliant Reloder-50 | 88.9 gr | 86% | 41,307 psi | 65% | 2687 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,037 psi | 77% | 2762 fps | 98.8% |
| Bofors RP15 | <<locked>> | 80% | 49,342 psi | 77% | 2785 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 42,960 psi | 67% | 2690 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 53,026 psi | 83% | 2848 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,062 psi | 67% | 2687 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,432 psi | 84% | 2825 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,469 psi | 71% | 2808 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,819 psi | 45% | 1667 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,548 psi | 84% | 2867 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 80% | 51,184 psi | 80% | 2841 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 46,717 psi | 73% | 2664 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,360 psi | 54% | 2516 fps | 97.6% |
| Lovex D100 | <<locked>> | 88% | 50,676 psi | 79% | 2772 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 45,556 psi | 71% | 2638 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,114 psi | 55% | 2543 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 52,388 psi | 82% | 2861 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,431 psi | 82% | 2907 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 80% | 47,311 psi | 74% | 2733 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,675 psi | 47% | 1706 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,353 psi | 71% | 2785 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,452 psi | 65% | 2687 fps | 98.5% |
| Shooters World 50 BMG | <<locked>> | 88% | 50,676 psi | 79% | 2772 fps | 95.3% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,626 psi | 65% | 2641 fps | 95.9% |
| Vihtavuori 20N29 | <<locked>> | 96% | 44,875 psi | 70% | 2723 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 80% | 50,024 psi | 78% | 2726 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,178 psi | 68% | 2638 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 80% | 47,253 psi | 74% | 2756 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 42,395 psi | 66% | 2703 fps | 98.3% |
| Vihtavuori N570 | 79.8 gr | 80% | 40,582 psi | 64% | 2697 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 52,939 psi | 83% | 2844 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,678 psi | 83% | 2782 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 | 180gr | Lapua ScenarL. ADI AR 2218 delivers the highest muzzle velocity at 3,048 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,048 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 180.0 gr projectile in 0.284" calls for a 1:9.5 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-50 rank at the top here: for 7 mm KM Katzmaier with the .284 | 180gr | Lapua ScenarL 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.