Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 175gr | A-Square MONO RN bullet and 35 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Alliant Reloder-50 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 8700 | <<locked>> | 98% | 56,376 psi | 88% | 2953 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 88% | 54,998 psi | 86% | 2923 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 55,970 psi | 88% | 3064 fps | 99.8% |
| ADI AR 2225 | <<locked>> | 90% | 55,506 psi | 87% | 2946 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 57,624 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 84% | 55,129 psi | 86% | 2907 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 54,143 psi | 85% | 2969 fps | 99.3% |
| Alliant Reloder-50 | <<locked>> | 92% | 54,868 psi | 86% | 2972 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 54,462 psi | 85% | 2890 fps | 99.5% |
| Bofors RP15 | <<locked>> | 82% | 55,085 psi | 86% | 2917 fps | 100% |
| Bofors RP30 | <<locked>> | 86% | 55,114 psi | 86% | 2936 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 56,144 psi | 88% | 2936 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 55,506 psi | 87% | 3005 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,377 psi | 60% | 1906 fps | 100% |
| Hodgdon US 869 | <<locked>> | 96% | 56,695 psi | 89% | 2953 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 82% | 57,334 psi | 90% | 2972 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 86% | 55,230 psi | 87% | 2854 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 92% | 54,505 psi | 85% | 2940 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 57,159 psi | 90% | 2913 fps | 96.8% |
| Lovex S071 | <<locked>> | 86% | 57,377 psi | 90% | 2854 fps | 100% |
| Norma 217 | <<locked>> | 92% | 56,231 psi | 88% | 2959 fps | 100% |
| Ramshot LRT | <<locked>> | 92% | 55,332 psi | 87% | 2986 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 84% | 57,551 psi | 90% | 2920 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,407 psi | 62% | 1949 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 56,057 psi | 88% | 2982 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 55,085 psi | 86% | 2966 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 57,159 psi | 90% | 2913 fps | 96.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 57,711 psi | 90% | 2956 fps | 99.3% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 55,143 psi | 86% | 2936 fps | 97.8% |
| Vihtavuori 24N41 | <<locked>> | 94% | 57,217 psi | 90% | 2966 fps | 96.3% |
| Vihtavuori N165 | <<locked>> | 82% | 55,564 psi | 87% | 2848 fps | 100% |
| Vihtavuori N170 | <<locked>> | 86% | 55,129 psi | 86% | 2890 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 84% | 56,652 psi | 89% | 2946 fps | 100% |
| Vihtavuori N568 | <<locked>> | 86% | 55,245 psi | 87% | 2966 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 57,174 psi | 90% | 3041 fps | 99.5% |
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 8700 | <<locked>> | 88% | 39,117 psi | 61% | 2635 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 80% | 41,568 psi | 65% | 2687 fps | 99.5% |
| ADI AR 2218 | 88.8 gr | 82% | 38,479 psi | 60% | 2700 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 38,972 psi | 61% | 2661 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 54,012 psi | 85% | 2822 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 48,211 psi | 76% | 2795 fps | 100% |
| Alliant Reloder-33 | 88.2 gr | 80% | 40,118 psi | 63% | 2694 fps | 96.1% |
| Alliant Reloder-50 | 92.4 gr | 84% | 40,901 psi | 64% | 2700 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 51,111 psi | 80% | 2831 fps | 99.1% |
| Bofors RP15 | <<locked>> | 80% | 51,634 psi | 81% | 2861 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 45,020 psi | 71% | 2759 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 45,237 psi | 71% | 2756 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 48,080 psi | 75% | 2884 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,834 psi | 45% | 1706 fps | 100% |
| Hodgdon US 869 | <<locked>> | 94% | 52,794 psi | 83% | 2887 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 80% | 53,592 psi | 84% | 2917 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 82% | 48,588 psi | 76% | 2740 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 36,332 psi | 57% | 2585 fps | 98.1% |
| Lovex D100 | <<locked>> | 86% | 49,574 psi | 78% | 2785 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 47,456 psi | 74% | 2703 fps | 100% |
| Norma 217 | <<locked>> | 80% | 37,188 psi | 58% | 2615 fps | 99.7% |
| Ramshot LRT | <<locked>> | 90% | 51,605 psi | 81% | 2920 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 80% | 49,850 psi | 78% | 2805 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,660 psi | 46% | 1745 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 48,037 psi | 75% | 2858 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 43,932 psi | 69% | 2762 fps | 99% |
| Shooters World 50 BMG | <<locked>> | 86% | 49,574 psi | 78% | 2785 fps | 95% |
| SNPE Vectan SP 13 | <<locked>> | 88% | 41,002 psi | 64% | 2651 fps | 95.6% |
| Vihtavuori 20N29 | <<locked>> | 94% | 44,498 psi | 70% | 2740 fps | 95% |
| Vihtavuori 24N41 | <<locked>> | 92% | 53,185 psi | 83% | 2897 fps | 95.3% |
| Vihtavuori N165 | <<locked>> | 80% | 51,938 psi | 81% | 2792 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 45,136 psi | 71% | 2710 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 80% | 49,632 psi | 78% | 2831 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 80% | 44,657 psi | 70% | 2776 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 80% | 42,917 psi | 67% | 2772 fps | 96.6% |
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 36 powders for 7 mm KM Katzmaier loaded with the .284 | 175gr | A-Square MONO RN. ADI AR 2218 delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,064 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 36 of the 36 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 175.0 gr projectile in 0.284" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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, Alliant Reloder-50, Alliant Reloder-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 175gr | A-Square MONO RN 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.