Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 170gr | Sierra RN Prohunter bullet and 39 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>> | 82% | 56,275 psi | 88% | 2874 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 57,334 psi | 90% | 3005 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 82% | 56,043 psi | 88% | 2986 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,101 psi | 88% | 2979 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 57,159 psi | 90% | 3120 fps | 99.7% |
| ADI AR 2225 | <<locked>> | 92% | 56,434 psi | 88% | 3002 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 56,652 psi | 89% | 2976 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,274 psi | 87% | 2881 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 56,420 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 55,085 psi | 86% | 3022 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 94% | 55,666 psi | 87% | 3025 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,985 psi | 88% | 2946 fps | 99.4% |
| Bofors RP15 | <<locked>> | 84% | 56,275 psi | 88% | 2972 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 56,246 psi | 88% | 2989 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 56,652 psi | 89% | 2976 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 57,479 psi | 90% | 2995 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 57,116 psi | 90% | 2956 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 56,478 psi | 89% | 3061 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,290 psi | 60% | 1926 fps | 100% |
| Hodgdon US 869 | <<locked>> | 98% | 57,725 psi | 90% | 3002 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 54,897 psi | 86% | 2972 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 56,811 psi | 89% | 2910 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 94% | 55,448 psi | 87% | 2995 fps | 100% |
| Lovex S071 | <<locked>> | 86% | 55,158 psi | 86% | 2861 fps | 100% |
| Norma 217 | <<locked>> | 94% | 57,130 psi | 90% | 3012 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 56,507 psi | 89% | 2995 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 54,969 psi | 86% | 2920 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,305 psi | 62% | 1969 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 57,116 psi | 90% | 3041 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 56,275 psi | 88% | 3022 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 54,853 psi | 86% | 2946 fps | 98.6% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 52,112 psi | 82% | 2920 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 84% | 56,913 psi | 89% | 2900 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 56,521 psi | 89% | 2946 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 84% | 54,201 psi | 85% | 2943 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 56,434 psi | 88% | 3025 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 54,157 psi | 85% | 3028 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 82% | 56,913 psi | 89% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 56,449 psi | 88% | 2910 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% | 52,808 psi | 83% | 2825 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 39,624 psi | 62% | 2677 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 80% | 52,286 psi | 82% | 2927 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 39,508 psi | 62% | 2677 fps | 98.9% |
| ADI AR 2218 | 89.1 gr | 84% | 39,291 psi | 62% | 2753 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 36,883 psi | 58% | 2654 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,026 psi | 83% | 2920 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 51,692 psi | 81% | 2828 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 45,919 psi | 72% | 2799 fps | 100% |
| Alliant Reloder-33 | 88.6 gr | 82% | 40,973 psi | 64% | 2746 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 86% | 41,466 psi | 65% | 2749 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,139 psi | 77% | 2831 fps | 98.5% |
| Bofors RP15 | <<locked>> | 80% | 49,414 psi | 77% | 2858 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,004 psi | 67% | 2756 fps | 99.4% |
| Bofors RP5 | <<locked>> | 80% | 53,026 psi | 83% | 2920 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,033 psi | 67% | 2749 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 53,432 psi | 84% | 2897 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 80% | 45,469 psi | 71% | 2877 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,689 psi | 45% | 1719 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 53,809 psi | 84% | 2936 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 80% | 51,242 psi | 80% | 2913 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 84% | 49,850 psi | 78% | 2789 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,360 psi | 54% | 2572 fps | 97.1% |
| Lovex S071 | <<locked>> | 80% | 45,527 psi | 71% | 2707 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,056 psi | 55% | 2598 fps | 99.1% |
| Ramshot Grand | <<locked>> | 80% | 52,417 psi | 82% | 2933 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 47,413 psi | 74% | 2802 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,660 psi | 46% | 1765 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 45,382 psi | 71% | 2851 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 41,611 psi | 65% | 2749 fps | 98.2% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 41,771 psi | 65% | 2703 fps | 95.4% |
| Vihtavuori 20N29 | <<locked>> | 98% | 48,472 psi | 76% | 2851 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 80% | 50,067 psi | 78% | 2795 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,192 psi | 68% | 2700 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 80% | 47,311 psi | 74% | 2822 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 80% | 42,511 psi | 67% | 2766 fps | 98% |
| Vihtavuori N570 | 83.1 gr | 80% | 40,567 psi | 64% | 2753 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 53,011 psi | 83% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 52,779 psi | 83% | 2854 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 39 powders for 7 mm KM Katzmaier loaded with the .284 | 170gr | Sierra RN Prohunter. ADI AR 2218 delivers the highest muzzle velocity at 3,120 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,120 fps. Accurate 8700 gives the best case fill at 100 %, and 39 of the 39 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 170.0 gr projectile in 0.284" calls for a 1:12.5 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, Alliant Reloder-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 170gr | Sierra RN Prohunter 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.