Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 160gr | Winchester Silvertip 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% | 55,259 psi | 87% | 2936 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3051 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 82% | 54,926 psi | 86% | 3045 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 54,839 psi | 86% | 3031 fps | 100% |
| ADI AR 2218 | <<locked>> | 94% | 55,695 psi | 87% | 3166 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 92% | 55,100 psi | 86% | 3058 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 55,593 psi | 87% | 3038 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 54,114 psi | 85% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 55,129 psi | 86% | 3022 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 53,824 psi | 84% | 3071 fps | 98.8% |
| Alliant Reloder-50 | <<locked>> | 94% | 54,346 psi | 85% | 3068 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 55,056 psi | 86% | 3005 fps | 99.1% |
| Bofors RP15 | <<locked>> | 84% | 55,216 psi | 87% | 3031 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 55,071 psi | 86% | 3048 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 55,593 psi | 87% | 3038 fps | 100% |
| Hodgdon H1000 | <<locked>> | 88% | 56,231 psi | 88% | 3051 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 57,043 psi | 89% | 3031 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 82% | 56,115 psi | 88% | 3015 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 86% | 54,940 psi | 86% | 3117 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,203 psi | 60% | 1985 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 56,913 psi | 89% | 3005 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 57,595 psi | 90% | 3091 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 55,753 psi | 87% | 2963 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 54,070 psi | 85% | 3045 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 57,493 psi | 90% | 2969 fps | 100% |
| Norma 217 | <<locked>> | 94% | 55,637 psi | 87% | 3068 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 55,187 psi | 86% | 3054 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 53,577 psi | 84% | 2976 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,189 psi | 61% | 2028 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 55,695 psi | 87% | 3097 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 54,868 psi | 86% | 3074 fps | 99.8% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 3058 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 84% | 55,869 psi | 88% | 2963 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 55,550 psi | 87% | 2999 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 86% | 56,724 psi | 89% | 3058 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 55,187 psi | 86% | 3074 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 90% | 56,811 psi | 89% | 3146 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 82% | 55,535 psi | 87% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 55,434 psi | 87% | 2969 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% | 51,605 psi | 81% | 2881 fps | 100% |
| Accurate 8700 | <<locked>> | 92% | 41,539 psi | 65% | 2782 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 80% | 51,140 psi | 80% | 2979 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 38,551 psi | 60% | 2720 fps | 98.2% |
| ADI AR 2218 | 93.1 gr | 86% | 41,191 psi | 65% | 2861 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 35,897 psi | 56% | 2694 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 51,895 psi | 81% | 2976 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 50,676 psi | 79% | 2887 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 44,831 psi | 70% | 2851 fps | 100% |
| Alliant Reloder-33 | 92.7 gr | 84% | 43,018 psi | 67% | 2858 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 88% | 43,482 psi | 68% | 2854 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 48,269 psi | 76% | 2881 fps | 97.9% |
| Bofors RP15 | <<locked>> | 80% | 48,428 psi | 76% | 2913 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 41,829 psi | 66% | 2799 fps | 98.9% |
| Bofors RP5 | <<locked>> | 80% | 51,895 psi | 81% | 2976 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 41,945 psi | 66% | 2799 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 80% | 53,417 psi | 84% | 2969 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 52,373 psi | 82% | 2953 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 44,193 psi | 69% | 2927 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,674 psi | 45% | 1775 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 53,432 psi | 84% | 2949 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 50,096 psi | 79% | 2966 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 52,301 psi | 82% | 2900 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 33,460 psi | 52% | 2608 fps | 96.1% |
| Lovex S071 | <<locked>> | 80% | 44,556 psi | 70% | 2759 fps | 100% |
| Norma 217 | <<locked>> | 80% | 34,069 psi | 53% | 2638 fps | 98.4% |
| Ramshot Grand | <<locked>> | 80% | 51,242 psi | 80% | 2989 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 46,325 psi | 73% | 2851 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,472 psi | 46% | 1818 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 44,048 psi | 69% | 2897 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 40,451 psi | 63% | 2789 fps | 97.3% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 43,627 psi | 68% | 2802 fps | 95.4% |
| Vihtavuori N165 | <<locked>> | 80% | 48,921 psi | 77% | 2851 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 45,266 psi | 71% | 2808 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 80% | 46,340 psi | 73% | 2874 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 41,336 psi | 65% | 2805 fps | 97.1% |
| Vihtavuori N570 | 87 gr | 82% | 42,540 psi | 67% | 2864 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 51,503 psi | 81% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 51,706 psi | 81% | 2910 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 46 powders for 7 mm KM Katzmaier loaded with the .284 | 160gr | Winchester Silvertip. ADI AR 2218 delivers the highest muzzle velocity at 3,166 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,166 fps. Accurate 8700 gives the best case fill at 100 %, and 46 of the 46 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 1:16.0 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 | Winchester Silvertip they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG 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.