Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 160gr | Barnes MRX BT 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% | 56,391 psi | 88% | 2959 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,997 psi | 83% | 3005 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 82% | 55,782 psi | 87% | 3074 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 57,406 psi | 90% | 3051 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,536 psi | 89% | 3074 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,115 psi | 88% | 3058 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,145 psi | 90% | 3196 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 94% | 55,985 psi | 88% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,087 psi | 89% | 3041 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,000 psi | 89% | 3064 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,158 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,318 psi | 88% | 3045 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,824 psi | 86% | 3091 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,853 psi | 86% | 3084 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,623 psi | 89% | 3031 fps | 99.2% |
| Bofors RP15 | <<locked>> | 86% | 56,405 psi | 88% | 3054 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,970 psi | 88% | 3064 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,000 psi | 89% | 3064 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,551 psi | 90% | 3074 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,955 psi | 86% | 3002 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,027 psi | 85% | 2982 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,115 psi | 88% | 3140 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,985 psi | 60% | 1975 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,984 psi | 86% | 2976 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 55,085 psi | 86% | 3054 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,522 psi | 90% | 2992 fps | 96.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,766 psi | 86% | 3061 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 54,868 psi | 86% | 2936 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,449 psi | 88% | 3084 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,101 psi | 89% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,695 psi | 89% | 3081 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,969 psi | 86% | 3002 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,088 psi | 61% | 2021 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,927 psi | 89% | 3123 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,014 psi | 88% | 3097 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 57,551 psi | 90% | 3018 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,811 psi | 89% | 3031 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 3012 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,449 psi | 88% | 3028 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,087 psi | 89% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,421 psi | 90% | 2989 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,710 psi | 89% | 3022 fps | 98% |
| Vihtavuori N555 | <<locked>> | 82% | 56,768 psi | 89% | 2992 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,434 psi | 88% | 3084 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 54,085 psi | 85% | 3022 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 90% | 56,202 psi | 88% | 3097 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 53,795 psi | 84% | 3100 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,579 psi | 89% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,029 psi | 89% | 2999 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% | 49,168 psi | 77% | 2848 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 42,061 psi | 66% | 2799 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 51,938 psi | 81% | 3009 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 80% | 53,621 psi | 84% | 2989 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,936 psi | 77% | 2943 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 80% | 36,477 psi | 57% | 2677 fps | 97.5% |
| ADI AR 2218 | 93.5 gr | 88% | 42,032 psi | 66% | 2887 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 33,721 psi | 53% | 2644 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,432 psi | 84% | 2982 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,574 psi | 78% | 2940 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,240 psi | 76% | 2858 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,453 psi | 67% | 2812 fps | 100% |
| Alliant Reloder-33 | 90.9 gr | 84% | 40,379 psi | 63% | 2802 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 90% | 43,743 psi | 69% | 2867 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,398 psi | 73% | 2848 fps | 97.4% |
| Bofors RP15 | <<locked>> | 80% | 46,151 psi | 72% | 2874 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 39,566 psi | 62% | 2753 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 49,574 psi | 78% | 2940 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,929 psi | 63% | 2759 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 51,314 psi | 80% | 2936 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,285 psi | 79% | 2920 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 80% | 41,698 psi | 65% | 2877 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 45% | 1768 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,517 psi | 81% | 2917 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 47,790 psi | 75% | 2927 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 86% | 50,343 psi | 79% | 2867 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,576 psi | 53% | 2618 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 42,177 psi | 66% | 2720 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,720 psi | 50% | 2582 fps | 97.5% |
| Norma MRP | <<locked>> | 80% | 53,156 psi | 83% | 3012 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,602 psi | 76% | 2946 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 43,772 psi | 69% | 2808 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,312 psi | 46% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,379 psi | 65% | 2851 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,884 psi | 59% | 2733 fps | 96.3% |
| Rottweil R 904 | <<locked>> | 80% | 53,853 psi | 84% | 2959 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 53,229 psi | 83% | 2972 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,135 psi | 69% | 2818 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,881 psi | 83% | 2969 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,272 psi | 83% | 2940 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,920 psi | 74% | 2818 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 46,166 psi | 72% | 2828 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 53,055 psi | 83% | 2936 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,533 psi | 82% | 3018 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 43,787 psi | 69% | 2828 fps | 98.7% |
| Vihtavuori N568 | <<locked>> | 80% | 39,015 psi | 61% | 2756 fps | 96.2% |
| Vihtavuori N570 | 87.4 gr | 84% | 43,163 psi | 68% | 2884 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,588 psi | 76% | 2936 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,545 psi | 78% | 2877 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 56 powders for 7 mm KM Katzmaier loaded with the .284 | 160gr | Barnes MRX BT. ADI AR 2218 delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,196 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 1:12.0 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-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 160gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG, Hodgdon US 869, Vihtavuori 20N29 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.