Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | Sierra GameKing 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 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% | 56,608 psi | 89% | 2844 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 2972 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 82% | 56,188 psi | 88% | 2953 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,304 psi | 88% | 2943 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 57,290 psi | 90% | 3091 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 92% | 56,521 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,826 psi | 89% | 2946 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,390 psi | 87% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,507 psi | 89% | 2927 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,361 psi | 87% | 2995 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,811 psi | 87% | 2995 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,144 psi | 88% | 2917 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 56,434 psi | 88% | 2940 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,391 psi | 88% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,826 psi | 89% | 2946 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,682 psi | 90% | 2959 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,290 psi | 90% | 2923 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,594 psi | 89% | 3028 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,261 psi | 60% | 1893 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,071 psi | 86% | 2940 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,913 psi | 89% | 2877 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,550 psi | 87% | 2959 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 54,737 psi | 86% | 2874 fps | 96.1% |
| Lovex S071 | <<locked>> | 86% | 55,259 psi | 87% | 2828 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,246 psi | 90% | 2979 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,565 psi | 89% | 2963 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 56,666 psi | 89% | 3012 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 84% | 55,143 psi | 86% | 2890 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,305 psi | 62% | 1936 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,435 psi | 90% | 3012 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,275 psi | 88% | 2989 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 54,737 psi | 86% | 2874 fps | 96.1% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,969 psi | 86% | 2920 fps | 98.8% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,170 psi | 82% | 2890 fps | 97% |
| Vihtavuori N165 | <<locked>> | 84% | 57,116 psi | 90% | 2871 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,782 psi | 89% | 2917 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 84% | 54,288 psi | 85% | 2913 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,492 psi | 89% | 2989 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 54,433 psi | 85% | 3002 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 57,261 psi | 90% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,666 psi | 89% | 2877 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% | 52,895 psi | 83% | 2792 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,740 psi | 62% | 2651 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 80% | 52,402 psi | 82% | 2890 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,581 psi | 62% | 2651 fps | 99.1% |
| ADI AR 2218 | 87.6 gr | 84% | 39,465 psi | 62% | 2730 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 36,985 psi | 58% | 2628 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,113 psi | 83% | 2887 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,909 psi | 81% | 2795 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,151 psi | 72% | 2769 fps | 100% |
| Alliant Reloder-33 | 84.9 gr | 80% | 38,043 psi | 60% | 2651 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 86% | 41,539 psi | 65% | 2723 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,342 psi | 77% | 2802 fps | 98.7% |
| Bofors RP15 | <<locked>> | 80% | 49,501 psi | 78% | 2828 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,091 psi | 68% | 2726 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 53,113 psi | 83% | 2887 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,308 psi | 68% | 2726 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,548 psi | 84% | 2864 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,600 psi | 71% | 2848 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,790 psi | 45% | 1696 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,343 psi | 80% | 2881 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 46,934 psi | 74% | 2703 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,534 psi | 54% | 2549 fps | 97.5% |
| Lovex D100 | <<locked>> | 88% | 51,024 psi | 80% | 2808 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 45,672 psi | 72% | 2674 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,273 psi | 55% | 2579 fps | 99.3% |
| Ramshot Grand | <<locked>> | 80% | 52,620 psi | 82% | 2904 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 52,692 psi | 83% | 2943 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 80% | 47,471 psi | 74% | 2769 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,631 psi | 46% | 1736 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,643 psi | 72% | 2825 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,713 psi | 65% | 2723 fps | 98.4% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,024 psi | 80% | 2808 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,843 psi | 66% | 2674 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,208 psi | 71% | 2759 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 80% | 50,154 psi | 79% | 2766 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,352 psi | 68% | 2674 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 80% | 47,456 psi | 74% | 2795 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 80% | 42,569 psi | 67% | 2736 fps | 98.2% |
| Vihtavuori N570 | 81.7 gr | 80% | 40,770 psi | 64% | 2730 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,243 psi | 83% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,939 psi | 83% | 2822 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 | 175gr | Sierra GameKing. ADI AR 2218 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,091 fps. Accurate 8700 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 175.0 gr projectile in 0.284" calls for a 1:10.5 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-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 175gr | Sierra GameKing 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.