Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 160gr | NorthFork Bonded Core bullet and 49 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>> | 84% | 56,449 psi | 88% | 2956 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,417 psi | 82% | 2995 fps | 98% |
| Accurate MAGPRO | <<locked>> | 82% | 55,666 psi | 87% | 3068 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 57,130 psi | 90% | 3041 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,188 psi | 88% | 3064 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,753 psi | 87% | 3051 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,478 psi | 89% | 3182 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 94% | 55,521 psi | 87% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,884 psi | 89% | 3031 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,753 psi | 89% | 3058 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,085 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,898 psi | 88% | 3038 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,491 psi | 85% | 3087 fps | 98.7% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,766 psi | 86% | 3084 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,289 psi | 88% | 3025 fps | 99.1% |
| Bofors RP15 | <<locked>> | 86% | 56,173 psi | 88% | 3048 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,941 psi | 88% | 3064 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,753 psi | 89% | 3058 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,159 psi | 90% | 3068 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,636 psi | 86% | 2989 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,537 psi | 90% | 3038 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,753 psi | 87% | 3136 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 60% | 1965 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,810 psi | 86% | 2969 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 54,926 psi | 86% | 3051 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,159 psi | 90% | 2979 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,679 psi | 86% | 3061 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 54,940 psi | 86% | 2933 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,173 psi | 88% | 3081 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,898 psi | 89% | 3071 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,376 psi | 88% | 3074 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,766 psi | 86% | 2995 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,160 psi | 61% | 2014 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,463 psi | 88% | 3117 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,637 psi | 87% | 3091 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 57,319 psi | 90% | 3012 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,826 psi | 89% | 3028 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3005 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,463 psi | 88% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,913 psi | 89% | 2992 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,232 psi | 90% | 2982 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,724 psi | 89% | 3018 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 82% | 56,753 psi | 89% | 2989 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,188 psi | 88% | 3077 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 57,696 psi | 90% | 3077 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,898 psi | 88% | 3091 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 57,595 psi | 90% | 3163 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,304 psi | 88% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,855 psi | 89% | 2992 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% | 49,385 psi | 77% | 2844 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 41,916 psi | 66% | 2792 fps | 95% |
| Accurate MAGPRO | <<locked>> | 80% | 51,793 psi | 81% | 3002 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 80% | 53,548 psi | 84% | 2986 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,921 psi | 77% | 2940 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 36,593 psi | 57% | 2677 fps | 97.5% |
| ADI AR 2218 | 91.3 gr | 88% | 41,930 psi | 66% | 2884 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 33,881 psi | 53% | 2648 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,229 psi | 83% | 2972 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,661 psi | 78% | 2940 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,298 psi | 76% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,540 psi | 67% | 2815 fps | 100% |
| Alliant Reloder-33 | 90.9 gr | 86% | 43,569 psi | 68% | 2877 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 90% | 43,816 psi | 69% | 2871 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,151 psi | 72% | 2838 fps | 97.2% |
| Bofors RP15 | <<locked>> | 80% | 46,238 psi | 72% | 2874 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 39,711 psi | 62% | 2756 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 49,661 psi | 78% | 2940 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,914 psi | 63% | 2756 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 51,184 psi | 80% | 2933 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,299 psi | 79% | 2917 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 80% | 41,582 psi | 65% | 2877 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,660 psi | 45% | 1762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,474 psi | 81% | 2910 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 47,761 psi | 75% | 2923 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,635 psi | 84% | 2920 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,488 psi | 49% | 2562 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 42,656 psi | 67% | 2723 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,966 psi | 50% | 2592 fps | 97.6% |
| Norma MRP | <<locked>> | 80% | 53,098 psi | 83% | 3012 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,486 psi | 76% | 2940 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 43,729 psi | 69% | 2808 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,457 psi | 46% | 1804 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,321 psi | 65% | 2851 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,072 psi | 60% | 2740 fps | 96.4% |
| Rottweil R 904 | <<locked>> | 80% | 53,766 psi | 84% | 2953 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 53,069 psi | 83% | 2966 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,005 psi | 69% | 2815 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,736 psi | 83% | 2963 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,432 psi | 84% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,891 psi | 73% | 2815 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 46,311 psi | 73% | 2828 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 53,214 psi | 83% | 2936 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,446 psi | 82% | 3012 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 43,961 psi | 69% | 2831 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 39,059 psi | 61% | 2759 fps | 96.2% |
| Vihtavuori N570 | 85.4 gr | 84% | 43,163 psi | 68% | 2884 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,544 psi | 76% | 2936 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,530 psi | 78% | 2871 fps | 99.9% |
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 56 powders for 7 mm KM Katzmaier loaded with the .284 | 160gr | NorthFork Bonded Core. ADI AR 2218 delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,965 fps to 3,182 fps. Accurate 8700 gives the best case fill at 100 %, and 56 of the 56 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 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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 | 160gr | NorthFork Bonded Core they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Lovex D100, Ramshot LRT burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.