Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 160gr | Winchester FailSafe bullet and 45 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 IMR 8133 Enduron.
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% | 57,377 psi | 90% | 2969 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,621 psi | 84% | 3015 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 82% | 56,565 psi | 89% | 3084 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 84% | 57,116 psi | 90% | 3077 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,840 psi | 89% | 3064 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 53,635 psi | 84% | 3133 fps | 99% |
| ADI AR 2225 | <<locked>> | 94% | 56,811 psi | 89% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,609 psi | 90% | 3045 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,682 psi | 90% | 3071 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,057 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,043 psi | 89% | 3051 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,651 psi | 87% | 3107 fps | 99% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,072 psi | 88% | 3104 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,145 psi | 90% | 3038 fps | 99.2% |
| Bofors RP15 | <<locked>> | 86% | 57,276 psi | 90% | 3064 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,884 psi | 89% | 3077 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,682 psi | 90% | 3071 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,230 psi | 85% | 3022 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,521 psi | 87% | 3005 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,592 psi | 86% | 2989 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,826 psi | 89% | 3150 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 60% | 1972 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,622 psi | 87% | 2982 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 55,898 psi | 88% | 3068 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,331 psi | 85% | 2936 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,724 psi | 87% | 3074 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,854 psi | 88% | 2946 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,319 psi | 90% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,377 psi | 90% | 3087 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,840 psi | 88% | 3012 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,160 psi | 61% | 2018 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 53,606 psi | 84% | 3071 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,898 psi | 89% | 3107 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 57,595 psi | 90% | 3038 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 3022 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,232 psi | 90% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 54,375 psi | 85% | 2940 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,580 psi | 90% | 3031 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 82% | 57,595 psi | 90% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,290 psi | 90% | 3094 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 54,984 psi | 86% | 3031 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 57,101 psi | 89% | 3110 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 90% | 54,737 psi | 86% | 3114 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,464 psi | 90% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,696 psi | 90% | 3005 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% | 50,314 psi | 79% | 2861 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 42,888 psi | 67% | 2815 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 80% | 52,721 psi | 83% | 3018 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 49,690 psi | 78% | 2953 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 80% | 37,275 psi | 58% | 2694 fps | 97.7% |
| ADI AR 2218 | 92.7 gr | 88% | 42,772 psi | 67% | 2904 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 34,635 psi | 54% | 2667 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,128 psi | 85% | 2989 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,430 psi | 79% | 2953 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,110 psi | 77% | 2867 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,323 psi | 68% | 2825 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 41,350 psi | 65% | 2825 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,889 psi | 70% | 2890 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,036 psi | 74% | 2858 fps | 97.5% |
| Bofors RP15 | <<locked>> | 80% | 46,978 psi | 74% | 2887 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 40,582 psi | 64% | 2776 fps | 98.6% |
| Bofors RP5 | <<locked>> | 80% | 50,430 psi | 79% | 2953 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,596 psi | 64% | 2769 fps | 99% |
| Hodgdon H4831 | <<locked>> | 80% | 51,895 psi | 81% | 2943 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,024 psi | 80% | 2930 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,583 psi | 67% | 2897 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,660 psi | 45% | 1768 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,156 psi | 82% | 2923 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 48,544 psi | 76% | 2940 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,053 psi | 80% | 2874 fps | 95.2% |
| IMR 8133 Enduron | 77.4 gr | 80% | 32,155 psi | 50% | 2579 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 43,279 psi | 68% | 2736 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,677 psi | 51% | 2608 fps | 97.9% |
| Ramshot Grand | <<locked>> | 80% | 49,501 psi | 78% | 2959 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 44,599 psi | 70% | 2822 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,472 psi | 46% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,409 psi | 66% | 2871 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 39,030 psi | 61% | 2762 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 53,838 psi | 84% | 2979 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,991 psi | 71% | 2835 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,490 psi | 84% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,732 psi | 75% | 2828 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 47,007 psi | 74% | 2844 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 54,070 psi | 85% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,388 psi | 84% | 3028 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 44,831 psi | 70% | 2848 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 80% | 39,871 psi | 62% | 2776 fps | 96.5% |
| Vihtavuori N570 | 86.7 gr | 84% | 44,034 psi | 69% | 2900 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,487 psi | 78% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,372 psi | 79% | 2887 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 45 powders for 7 mm KM Katzmaier loaded with the .284 | 160gr | Winchester FailSafe. Hodgdon Retumbo delivers the highest muzzle velocity at 3,150 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,150 fps. Accurate 8700 gives the best case fill at 100 %, and 45 of the 45 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 1:11.5 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, IMR 8133 Enduron rank at the top here: for 7 mm KM Katzmaier with the .284 | 160gr | Winchester FailSafe 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.