Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 155gr | Geco EXPRESS bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 56,130 psi | 88% | 2992 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 3025 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 82% | 55,230 psi | 87% | 3104 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 82% | 56,913 psi | 89% | 3081 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 55,811 psi | 87% | 3097 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,376 psi | 87% | 3084 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,202 psi | 88% | 3215 fps | 99.1% |
| ADI AR 2225 | <<locked>> | 94% | 55,216 psi | 87% | 3107 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,014 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,449 psi | 88% | 3068 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,391 psi | 88% | 3094 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 54,795 psi | 86% | 2995 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 55,622 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,085 psi | 85% | 3117 fps | 98.5% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,418 psi | 85% | 3110 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,014 psi | 88% | 3058 fps | 98.9% |
| Bofors RP15 | <<locked>> | 86% | 56,014 psi | 88% | 3087 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,477 psi | 87% | 3097 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,391 psi | 88% | 3094 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 56,782 psi | 89% | 3100 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,360 psi | 85% | 3025 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,188 psi | 90% | 3071 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,201 psi | 87% | 3169 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,956 psi | 59% | 1998 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 54,578 psi | 86% | 3005 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 54,563 psi | 86% | 3084 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,942 psi | 89% | 3012 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,230 psi | 85% | 3091 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 54,636 psi | 86% | 2969 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,695 psi | 87% | 3114 fps | 100% |
| Norma MRP | <<locked>> | 82% | 56,695 psi | 89% | 3107 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 55,898 psi | 88% | 3107 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,404 psi | 85% | 3031 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,073 psi | 61% | 2047 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,144 psi | 88% | 3153 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,317 psi | 87% | 3120 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 57,116 psi | 90% | 3048 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,391 psi | 88% | 3061 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 3035 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,028 psi | 88% | 3058 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,652 psi | 89% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 56,884 psi | 89% | 3015 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,318 psi | 88% | 3048 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 82% | 56,347 psi | 88% | 3025 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,985 psi | 88% | 3114 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 57,377 psi | 90% | 3110 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,608 psi | 87% | 3127 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 92% | 57,232 psi | 90% | 3196 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 55,825 psi | 87% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,492 psi | 89% | 3025 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% | 49,197 psi | 77% | 2881 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 44,889 psi | 70% | 2890 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 51,459 psi | 81% | 3035 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 80% | 53,156 psi | 83% | 3018 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,515 psi | 76% | 2969 fps | 99.4% |
| ADI AR 2217 | <<locked>> | 80% | 36,318 psi | 57% | 2703 fps | 97.1% |
| ADI AR 2218 | 92.7 gr | 88% | 41,611 psi | 65% | 2907 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 33,678 psi | 53% | 2674 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,534 psi | 84% | 3018 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,026 psi | 83% | 3012 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,269 psi | 77% | 2972 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,964 psi | 75% | 2887 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,177 psi | 66% | 2844 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 43,207 psi | 68% | 2900 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 90% | 43,497 psi | 68% | 2894 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,093 psi | 72% | 2874 fps | 96.9% |
| Bofors RP15 | <<locked>> | 80% | 45,890 psi | 72% | 2904 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 39,494 psi | 62% | 2785 fps | 98% |
| Bofors RP5 | <<locked>> | 80% | 49,269 psi | 77% | 2972 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 39,537 psi | 62% | 2782 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 80% | 50,792 psi | 80% | 2963 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,937 psi | 78% | 2946 fps | 99.2% |
| Hodgdon Retumbo | 79.6 gr | 80% | 41,365 psi | 65% | 2907 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,601 psi | 45% | 1795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,184 psi | 80% | 2943 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 47,355 psi | 74% | 2953 fps | 99.3% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,287 psi | 84% | 2949 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 82% | 33,547 psi | 53% | 2651 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 42,293 psi | 66% | 2753 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,633 psi | 50% | 2615 fps | 97.1% |
| Norma MRP | <<locked>> | 80% | 52,794 psi | 83% | 3045 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,182 psi | 76% | 2976 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 80% | 43,410 psi | 68% | 2838 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,385 psi | 46% | 1834 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,104 psi | 64% | 2884 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,855 psi | 59% | 2766 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 53,447 psi | 84% | 2989 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 52,692 psi | 83% | 3002 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 46,876 psi | 73% | 2907 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,344 psi | 82% | 2995 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,026 psi | 83% | 2969 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,702 psi | 73% | 2848 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 45,948 psi | 72% | 2858 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 52,881 psi | 83% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,156 psi | 82% | 3048 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 80% | 43,714 psi | 69% | 2861 fps | 98.4% |
| Vihtavuori N568 | <<locked>> | 80% | 38,754 psi | 61% | 2782 fps | 95.7% |
| Vihtavuori N570 | 86.7 gr | 84% | 42,772 psi | 67% | 2910 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,993 psi | 75% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,284 psi | 77% | 2907 fps | 99.9% |
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 | 155gr | Geco EXPRESS. ADI AR 2218 delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,215 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 155.0 gr projectile in 0.284" calls for a 1:11.0 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for 7 mm KM Katzmaier with the .284 | 155gr | Geco EXPRESS 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.