Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 160gr | Woodleigh PP SN bullet and 42 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 ReloadSwiss RS 80.
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% | 54,070 psi | 85% | 2920 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 54,172 psi | 85% | 3022 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 82% | 56,985 psi | 89% | 3091 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 84% | 57,537 psi | 90% | 3084 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 57,276 psi | 90% | 3071 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 53,998 psi | 85% | 3140 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 94% | 57,232 psi | 90% | 3094 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 54,360 psi | 85% | 3018 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,318 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,479 psi | 90% | 3058 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 56,202 psi | 88% | 3114 fps | 99% |
| Alliant Reloder-50 | <<locked>> | 96% | 56,594 psi | 89% | 3110 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,435 psi | 90% | 3045 fps | 99.3% |
| Bofors RP15 | <<locked>> | 86% | 57,508 psi | 90% | 3071 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 57,261 psi | 90% | 3084 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 54,360 psi | 85% | 3018 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 54,665 psi | 86% | 3028 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,898 psi | 88% | 3012 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,984 psi | 86% | 2999 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,334 psi | 90% | 3156 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,058 psi | 60% | 1975 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,840 psi | 88% | 2986 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 84% | 56,130 psi | 88% | 3068 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,694 psi | 86% | 2943 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 56,130 psi | 88% | 3081 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 56,289 psi | 88% | 2953 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,740 psi | 90% | 3100 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 53,650 psi | 84% | 3028 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 56,260 psi | 88% | 3018 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,204 psi | 61% | 2021 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 54,056 psi | 85% | 3077 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 57,276 psi | 90% | 3114 fps | 99.9% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3031 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,479 psi | 90% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 84% | 54,766 psi | 86% | 2946 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 54,128 psi | 85% | 2976 fps | 97.5% |
| Vihtavuori N560 | <<locked>> | 82% | 57,508 psi | 90% | 3097 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 55,405 psi | 87% | 3038 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 57,493 psi | 90% | 3117 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 90% | 55,143 psi | 86% | 3117 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 53,766 psi | 84% | 3015 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 54,128 psi | 85% | 2949 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% | 50,517 psi | 79% | 2864 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 43,366 psi | 68% | 2822 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 80% | 53,098 psi | 83% | 3025 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 49,922 psi | 78% | 2959 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 80% | 37,492 psi | 59% | 2697 fps | 97.8% |
| ADI AR 2218 | 93.2 gr | 88% | 43,091 psi | 68% | 2910 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 34,853 psi | 55% | 2671 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,662 psi | 79% | 2956 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,356 psi | 77% | 2871 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,555 psi | 68% | 2828 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 41,539 psi | 65% | 2828 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 88% | 42,047 psi | 66% | 2828 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 47,195 psi | 74% | 2861 fps | 97.5% |
| Bofors RP15 | <<locked>> | 80% | 47,239 psi | 74% | 2890 fps | 99.8% |
| Bofors RP30 | <<locked>> | 80% | 40,814 psi | 64% | 2779 fps | 98.6% |
| Bofors RP5 | <<locked>> | 80% | 50,662 psi | 79% | 2956 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,959 psi | 64% | 2779 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 80% | 52,272 psi | 82% | 2949 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,227 psi | 80% | 2933 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,830 psi | 67% | 2900 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,616 psi | 45% | 1768 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,359 psi | 82% | 2927 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 80% | 48,805 psi | 76% | 2943 fps | 99.6% |
| IMR 7977 Enduron | <<locked>> | 86% | 51,213 psi | 80% | 2881 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,387 psi | 51% | 2582 fps | 95.5% |
| Lovex S071 | <<locked>> | 80% | 43,656 psi | 68% | 2743 fps | 100% |
| Norma 217 | <<locked>> | 80% | 33,025 psi | 52% | 2615 fps | 98% |
| Ramshot Grand | <<locked>> | 80% | 49,748 psi | 78% | 2963 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 80% | 45,020 psi | 71% | 2831 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,414 psi | 46% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,627 psi | 67% | 2874 fps | 100% |
| ReloadSwiss RS 80 | 86.3 gr | 80% | 39,247 psi | 62% | 2766 fps | 96.9% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 45,295 psi | 71% | 2841 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,925 psi | 85% | 2982 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,950 psi | 75% | 2835 fps | 100% |
| Vihtavuori N170 | <<locked>> | 84% | 47,326 psi | 74% | 2851 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 80% | 53,635 psi | 84% | 3035 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 80% | 45,049 psi | 71% | 2851 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 80% | 40,248 psi | 63% | 2782 fps | 96.6% |
| Vihtavuori N570 | 87.2 gr | 84% | 44,425 psi | 70% | 2910 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,966 psi | 78% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,604 psi | 79% | 2890 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 48 powders for 7 mm KM Katzmaier loaded with the .284 | 160gr | Woodleigh PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,156 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,156 fps. Accurate 8700 gives the best case fill at 100 %, and 48 of the 48 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, ReloadSwiss RS 80 rank at the top here: for 7 mm KM Katzmaier with the .284 | 160gr | Woodleigh PP SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Vihtavuori 24N41 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.