Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 160gr | Speer Hot-Cor 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>> | 84% | 57,638 psi | 90% | 2972 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,998 psi | 85% | 3022 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 82% | 57,014 psi | 89% | 3091 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 84% | 57,392 psi | 90% | 3084 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,305 psi | 90% | 3071 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 54,041 psi | 85% | 3140 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 94% | 57,290 psi | 90% | 3094 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,215 psi | 85% | 3018 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,347 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,363 psi | 90% | 3058 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,086 psi | 88% | 3114 fps | 99% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,478 psi | 89% | 3110 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,508 psi | 90% | 3045 fps | 99.3% |
| Bofors RP15 | <<locked>> | 86% | 57,537 psi | 90% | 3068 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,319 psi | 90% | 3084 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,215 psi | 85% | 3018 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,491 psi | 85% | 3028 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,782 psi | 87% | 3009 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,853 psi | 86% | 2995 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,363 psi | 90% | 3159 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,087 psi | 60% | 1975 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,869 psi | 88% | 2986 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 56,173 psi | 88% | 3071 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,563 psi | 86% | 2940 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,173 psi | 88% | 3081 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,130 psi | 88% | 2949 fps | 100% |
| Norma 217 | <<locked>> | 94% | 53,882 psi | 84% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,711 psi | 90% | 3094 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,101 psi | 88% | 3015 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,233 psi | 61% | 2021 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 53,925 psi | 85% | 3074 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,319 psi | 90% | 3114 fps | 99.9% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3031 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,522 psi | 90% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 54,621 psi | 86% | 2943 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,172 psi | 85% | 2976 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 82% | 57,551 psi | 90% | 3097 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 55,259 psi | 87% | 3038 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 57,566 psi | 90% | 3117 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 90% | 55,172 psi | 86% | 3120 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 53,809 psi | 84% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,186 psi | 85% | 2949 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% | 50,430 psi | 79% | 2864 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 43,236 psi | 68% | 2818 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 80% | 53,156 psi | 83% | 3025 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 49,966 psi | 78% | 2959 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 80% | 37,521 psi | 59% | 2700 fps | 97.8% |
| ADI AR 2218 | 93.2 gr | 88% | 43,120 psi | 68% | 2910 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 34,867 psi | 55% | 2671 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,705 psi | 79% | 2959 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,400 psi | 77% | 2871 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,598 psi | 68% | 2831 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 41,597 psi | 65% | 2828 fps | 95.5% |
| Alliant Reloder-50 | 94.6 gr | 88% | 41,930 psi | 66% | 2825 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,239 psi | 74% | 2861 fps | 97.6% |
| Bofors RP15 | <<locked>> | 80% | 47,253 psi | 74% | 2894 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 40,698 psi | 64% | 2776 fps | 98.6% |
| Bofors RP5 | <<locked>> | 80% | 50,705 psi | 79% | 2959 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,843 psi | 64% | 2776 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 80% | 52,156 psi | 82% | 2949 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,271 psi | 80% | 2933 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,873 psi | 67% | 2904 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,631 psi | 45% | 1768 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,373 psi | 82% | 2930 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 48,834 psi | 77% | 2943 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,256 psi | 80% | 2881 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,416 psi | 51% | 2585 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 43,555 psi | 68% | 2740 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,953 psi | 52% | 2612 fps | 98% |
| Ramshot Grand | <<locked>> | 80% | 49,806 psi | 78% | 2963 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 44,904 psi | 70% | 2828 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,428 psi | 46% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,670 psi | 67% | 2874 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,247 psi | 62% | 2766 fps | 96.9% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 45,353 psi | 71% | 2841 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,780 psi | 84% | 2979 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,834 psi | 75% | 2831 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 47,224 psi | 74% | 2848 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 80% | 53,664 psi | 84% | 3035 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 45,092 psi | 71% | 2851 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 80% | 40,132 psi | 63% | 2782 fps | 96.6% |
| Vihtavuori N570 | 87.1 gr | 84% | 44,309 psi | 69% | 2907 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,835 psi | 78% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,633 psi | 79% | 2890 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 | 160gr | Speer Hot-Cor. Hodgdon Retumbo delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,159 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 160.0 gr projectile in 0.284" calls for a 1:12.0 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 | 160gr | Speer Hot-Cor 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.