Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 145gr | Speer Boat-Tail bullet and 51 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 Hodgdon Retumbo.
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>> | 84% | 54,331 psi | 85% | 3048 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,821 psi | 78% | 3058 fps | 96.5% |
| Accurate High Country | <<locked>> | 82% | 56,130 psi | 88% | 3209 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 84% | 57,145 psi | 90% | 3219 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 55,042 psi | 86% | 3136 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 53,911 psi | 84% | 3153 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 57,101 psi | 89% | 3192 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,795 psi | 84% | 3248 fps | 98.3% |
| ADI AR 2225 | <<locked>> | 96% | 56,768 psi | 89% | 3215 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,636 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,549 psi | 85% | 3150 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,492 psi | 89% | 3107 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,334 psi | 90% | 3189 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,363 psi | 90% | 3199 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,854 psi | 88% | 3228 fps | 98.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,188 psi | 88% | 3219 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,273 psi | 85% | 3104 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 57,653 psi | 90% | 3199 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,261 psi | 90% | 3209 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,549 psi | 85% | 3150 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,491 psi | 85% | 3150 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,362 psi | 88% | 3140 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,434 psi | 87% | 3123 fps | 99.5% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,695 psi | 89% | 3281 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 59% | 2064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,521 psi | 89% | 3117 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 56,246 psi | 88% | 3199 fps | 99.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,622 psi | 87% | 3196 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 56,405 psi | 88% | 3081 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,261 psi | 90% | 3222 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,534 psi | 85% | 3159 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,725 psi | 90% | 3222 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,289 psi | 88% | 3143 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,957 psi | 61% | 2113 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,693 psi | 84% | 3199 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,188 psi | 90% | 3235 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 82% | 55,405 psi | 87% | 3104 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 82% | 54,520 psi | 85% | 3117 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,735 psi | 81% | 3068 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,157 psi | 85% | 3114 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,826 psi | 89% | 3091 fps | 99.6% |
| Somchem S385 | <<locked>> | 82% | 54,795 psi | 86% | 3084 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,085 psi | 86% | 3074 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,534 psi | 85% | 3094 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 82% | 54,404 psi | 85% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 53,867 psi | 84% | 3159 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 88% | 55,288 psi | 87% | 3159 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 57,479 psi | 90% | 3238 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 92% | 54,911 psi | 86% | 3235 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,638 psi | 90% | 3205 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,723 psi | 86% | 3081 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% | 47,326 psi | 74% | 2930 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 46,195 psi | 72% | 2986 fps | 95.5% |
| Accurate High Country | <<locked>> | 80% | 52,272 psi | 82% | 3143 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 80% | 49,603 psi | 78% | 3081 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 80% | 51,430 psi | 81% | 3074 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 46,731 psi | 73% | 3018 fps | 98.8% |
| ADI AR 2217 | <<locked>> | 80% | 34,925 psi | 55% | 2736 fps | 95.7% |
| ADI AR 2218 | 98.1 gr | 92% | 46,412 psi | 73% | 3091 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 32,256 psi | 51% | 2703 fps | 97.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,169 psi | 80% | 3061 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,500 psi | 74% | 3018 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,224 psi | 72% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,408 psi | 63% | 2887 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,316 psi | 84% | 3133 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 44,512 psi | 70% | 3002 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 48,167 psi | 75% | 3068 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,541 psi | 70% | 2913 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 44,251 psi | 69% | 2949 fps | 99% |
| Bofors RP30 | <<locked>> | 80% | 37,724 psi | 59% | 2815 fps | 96.8% |
| Bofors RP5 | <<locked>> | 80% | 47,500 psi | 74% | 3018 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 80% | 37,956 psi | 59% | 2818 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 80% | 49,095 psi | 77% | 3012 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,283 psi | 76% | 2995 fps | 98.6% |
| Hodgdon Retumbo | 80.5 gr | 80% | 39,552 psi | 62% | 2946 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 45% | 1850 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,705 psi | 78% | 2995 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 80% | 45,556 psi | 71% | 2999 fps | 98.6% |
| IMR 8133 Enduron | <<locked>> | 84% | 34,301 psi | 54% | 2743 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 40,843 psi | 64% | 2802 fps | 99.8% |
| Norma 217 | <<locked>> | 80% | 30,095 psi | 47% | 2638 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 50,792 psi | 80% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,108 psi | 72% | 3015 fps | 99% |
| Ramshot Magnum | <<locked>> | 80% | 41,713 psi | 65% | 2881 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 46% | 1896 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 39,073 psi | 61% | 2913 fps | 99.6% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,943 psi | 61% | 2867 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 51,880 psi | 81% | 3041 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 50,952 psi | 80% | 3054 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 48,327 psi | 76% | 3005 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,604 psi | 79% | 3051 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 53,185 psi | 83% | 3031 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 51,314 psi | 80% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,976 psi | 70% | 2894 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 50,908 psi | 80% | 3025 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 51,068 psi | 80% | 3028 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,227 psi | 79% | 3094 fps | 99% |
| Vihtavuori N565 | <<locked>> | 80% | 42,003 psi | 66% | 2900 fps | 97.5% |
| Vihtavuori N568 | <<locked>> | 82% | 39,987 psi | 63% | 2887 fps | 95.4% |
| Vihtavuori N570 | 91.9 gr | 88% | 47,427 psi | 74% | 3087 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,876 psi | 72% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,587 psi | 75% | 2953 fps | 99.6% |
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 58 powders for 7 mm KM Katzmaier loaded with the .284 | 145gr | Speer Boat-Tail. Hodgdon Retumbo delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 2,064 fps to 3,281 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 145.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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, Hodgdon Retumbo rank at the top here: for 7 mm KM Katzmaier with the .284 | 145gr | Speer Boat-Tail they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT 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.