Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | Speer Grand Slam 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% | 57,087 psi | 89% | 2851 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 54,099 psi | 85% | 2920 fps | 99% |
| ADI AR 2213 | <<locked>> | 82% | 56,898 psi | 89% | 2963 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 57,159 psi | 90% | 2956 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 53,824 psi | 84% | 3028 fps | 99.6% |
| ADI AR 2225 | <<locked>> | 92% | 57,377 psi | 90% | 2979 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,537 psi | 90% | 2953 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,898 psi | 88% | 2851 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,217 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 56,130 psi | 88% | 3005 fps | 99.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 56,739 psi | 89% | 3009 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,637 psi | 89% | 2923 fps | 99.6% |
| Bofors RP15 | <<locked>> | 84% | 57,101 psi | 89% | 2949 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,087 psi | 89% | 2966 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,537 psi | 90% | 2953 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,360 psi | 85% | 2910 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,392 psi | 90% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,218 psi | 60% | 1896 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,811 psi | 87% | 2949 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,450 psi | 90% | 2887 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,376 psi | 88% | 2972 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,376 psi | 87% | 2884 fps | 96.3% |
| Lovex S071 | <<locked>> | 86% | 55,782 psi | 87% | 2831 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,244 psi | 85% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,334 psi | 90% | 2972 fps | 100% |
| Ramshot LRT | <<locked>> | 94% | 57,348 psi | 90% | 3022 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 84% | 55,811 psi | 87% | 2897 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,407 psi | 62% | 1942 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 53,940 psi | 85% | 2959 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,072 psi | 89% | 2999 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,376 psi | 87% | 2884 fps | 96.3% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 55,637 psi | 87% | 2927 fps | 98.9% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,982 psi | 83% | 2904 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 84% | 57,725 psi | 90% | 2877 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,290 psi | 90% | 2927 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 84% | 54,940 psi | 86% | 2920 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,334 psi | 90% | 3002 fps | 100% |
| Vihtavuori N570 | <<locked>> | 88% | 55,085 psi | 86% | 3009 fps | 99.2% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,290 psi | 90% | 2887 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% | 53,388 psi | 84% | 2799 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,422 psi | 63% | 2664 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 80% | 53,127 psi | 83% | 2904 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,176 psi | 63% | 2661 fps | 99.2% |
| ADI AR 2218 | 88.5 gr | 84% | 39,987 psi | 63% | 2743 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 37,608 psi | 59% | 2638 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,838 psi | 84% | 2897 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,446 psi | 82% | 2802 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,702 psi | 73% | 2776 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,609 psi | 61% | 2664 fps | 95.5% |
| Alliant Reloder-50 | 89.9 gr | 84% | 39,291 psi | 62% | 2667 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,705 psi | 78% | 2808 fps | 98.8% |
| Bofors RP15 | <<locked>> | 80% | 50,183 psi | 79% | 2838 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,598 psi | 68% | 2736 fps | 99.6% |
| Bofors RP5 | <<locked>> | 80% | 53,838 psi | 84% | 2897 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,816 psi | 69% | 2733 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,369 psi | 73% | 2858 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,834 psi | 45% | 1699 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 52,054 psi | 82% | 2890 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 47,311 psi | 74% | 2710 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,998 psi | 55% | 2559 fps | 97.7% |
| Lovex D100 | <<locked>> | 88% | 51,663 psi | 81% | 2818 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 46,166 psi | 72% | 2684 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,795 psi | 56% | 2585 fps | 99.4% |
| Ramshot Grand | <<locked>> | 80% | 53,359 psi | 84% | 2913 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 53,417 psi | 84% | 2956 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 80% | 48,138 psi | 75% | 2779 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,675 psi | 47% | 1739 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,209 psi | 72% | 2831 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,322 psi | 66% | 2733 fps | 98.6% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,663 psi | 81% | 2818 fps | 95.4% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,496 psi | 67% | 2687 fps | 96% |
| Vihtavuori 20N29 | <<locked>> | 96% | 45,992 psi | 72% | 2772 fps | 95.4% |
| Vihtavuori N165 | <<locked>> | 80% | 50,604 psi | 79% | 2772 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,859 psi | 69% | 2684 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 80% | 48,124 psi | 75% | 2805 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 80% | 43,192 psi | 68% | 2746 fps | 98.3% |
| Vihtavuori N570 | 82.6 gr | 80% | 41,408 psi | 65% | 2743 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,374 psi | 84% | 2828 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 | 175gr | Speer Grand Slam. Hodgdon Retumbo delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,038 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 175.0 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 | 175gr | Speer Grand Slam 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.