Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 157gr | CutEdge MTAC bullet and 50 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 Hodgdon Retumbo.
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>> | 86% | 57,421 psi | 90% | 2999 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,356 psi | 77% | 2969 fps | 97.1% |
| Accurate MAGPRO | <<locked>> | 84% | 56,913 psi | 89% | 3117 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 54,868 psi | 86% | 3035 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 57,595 psi | 90% | 3117 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 57,116 psi | 90% | 3097 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,490 psi | 84% | 3153 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 96% | 56,550 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,650 psi | 86% | 3028 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,259 psi | 85% | 3045 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,144 psi | 88% | 3005 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,014 psi | 89% | 3084 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,985 psi | 89% | 3094 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,405 psi | 87% | 3130 fps | 98.7% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,303 psi | 87% | 3117 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,143 psi | 85% | 3012 fps | 98.6% |
| Bofors RP15 | <<locked>> | 88% | 57,348 psi | 90% | 3097 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,753 psi | 89% | 3107 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,259 psi | 85% | 3045 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,360 psi | 85% | 3054 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,231 psi | 88% | 3045 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,245 psi | 87% | 3028 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,797 psi | 89% | 3182 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 59% | 1978 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,275 psi | 88% | 3018 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,188 psi | 88% | 3100 fps | 100% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,187 psi | 86% | 3097 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,825 psi | 87% | 2976 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,782 psi | 89% | 3120 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,259 psi | 85% | 3058 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,653 psi | 90% | 3123 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,101 psi | 88% | 3045 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,914 psi | 61% | 2028 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 57,653 psi | 90% | 3166 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,550 psi | 89% | 3133 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 55,158 psi | 86% | 3002 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 82% | 54,404 psi | 85% | 3018 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,184 psi | 80% | 2979 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,070 psi | 85% | 3015 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,536 psi | 89% | 2992 fps | 99.8% |
| Somchem S385 | <<locked>> | 82% | 54,476 psi | 85% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,708 psi | 86% | 2972 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,114 psi | 85% | 2999 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 84% | 57,740 psi | 90% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,551 psi | 90% | 3127 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 55,013 psi | 86% | 3061 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 57,101 psi | 89% | 3140 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 54,505 psi | 85% | 3140 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,145 psi | 90% | 3097 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,331 psi | 85% | 2979 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% | 46,746 psi | 73% | 2828 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 45,730 psi | 72% | 2897 fps | 96.1% |
| Accurate MAGPRO | <<locked>> | 80% | 49,284 psi | 77% | 2986 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 80% | 51,285 psi | 80% | 2976 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 46,630 psi | 73% | 2923 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 34,519 psi | 54% | 2648 fps | 96.4% |
| ADI AR 2218 | 92.5 gr | 90% | 42,525 psi | 67% | 2920 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 31,705 psi | 50% | 2612 fps | 98.2% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,010 psi | 80% | 2963 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,268 psi | 74% | 2923 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,006 psi | 72% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,103 psi | 63% | 2792 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,808 psi | 83% | 3028 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,121 psi | 69% | 2913 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,019 psi | 69% | 2900 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,367 psi | 70% | 2828 fps | 96.4% |
| Bofors RP15 | <<locked>> | 80% | 43,888 psi | 69% | 2858 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 37,260 psi | 58% | 2723 fps | 97.4% |
| Bofors RP5 | <<locked>> | 80% | 47,268 psi | 74% | 2923 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 37,681 psi | 59% | 2733 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 80% | 49,008 psi | 77% | 2920 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,124 psi | 75% | 2900 fps | 99% |
| Hodgdon Retumbo | 77.6 gr | 80% | 39,117 psi | 61% | 2848 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,369 psi | 44% | 1772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,516 psi | 78% | 2904 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 45,382 psi | 71% | 2907 fps | 99% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,765 psi | 53% | 2651 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 40,147 psi | 63% | 2703 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,573 psi | 46% | 2549 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 50,517 psi | 79% | 2995 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,890 psi | 72% | 2920 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 41,234 psi | 65% | 2785 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1814 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,725 psi | 61% | 2822 fps | 99.8% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 35,505 psi | 56% | 2700 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 51,677 psi | 81% | 2946 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 80% | 50,691 psi | 79% | 2956 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,512 psi | 70% | 2848 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,343 psi | 79% | 2953 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 52,939 psi | 83% | 2933 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 51,053 psi | 80% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,672 psi | 70% | 2799 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 47,007 psi | 74% | 2867 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 50,546 psi | 79% | 2923 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,009 psi | 78% | 2999 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 80% | 41,452 psi | 65% | 2802 fps | 97.9% |
| Vihtavuori N568 | <<locked>> | 82% | 39,436 psi | 62% | 2792 fps | 96% |
| Vihtavuori N570 | 86.6 gr | 86% | 43,584 psi | 68% | 2920 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,353 psi | 71% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,268 psi | 74% | 2861 fps | 99.8% |
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 50 powders for 7 mm KM Katzmaier loaded with the .284 | 157gr | CutEdge MTAC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,182 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,182 fps. Accurate 8700 gives the best case fill at 100 %, and 50 of the 50 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 157.0 gr projectile in 0.284" calls for a 1:9.0 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, Hodgdon Retumbo rank at the top here: for 7 mm KM Katzmaier with the .284 | 157gr | CutEdge MTAC 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.