Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 145gr | Hasler ARIETE bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 86% | 54,592 psi | 86% | 3058 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 53,693 psi | 84% | 3159 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 55,985 psi | 88% | 3153 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,636 psi | 86% | 3166 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 57,551 psi | 90% | 3205 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 54,215 psi | 85% | 3258 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 98% | 56,768 psi | 89% | 3222 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,057 psi | 88% | 3146 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,477 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,056 psi | 86% | 3159 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,768 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,595 psi | 90% | 3199 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,711 psi | 90% | 3209 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,927 psi | 88% | 3235 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3215 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,216 psi | 87% | 3123 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 54,491 psi | 85% | 3150 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,290 psi | 90% | 3215 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,056 psi | 86% | 3159 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,955 psi | 86% | 3163 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,305 psi | 90% | 3156 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,318 psi | 88% | 3143 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,086 psi | 88% | 3054 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,014 psi | 89% | 3294 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 59% | 2051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,479 psi | 90% | 3133 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 57,014 psi | 89% | 3212 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,477 psi | 87% | 3199 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 56,362 psi | 88% | 3084 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,710 psi | 89% | 3222 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,129 psi | 86% | 3176 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,070 psi | 85% | 3166 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 56,913 psi | 89% | 3156 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 61% | 2096 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,751 psi | 84% | 3209 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,145 psi | 90% | 3238 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 84% | 56,405 psi | 88% | 3120 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 55,216 psi | 87% | 3130 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,839 psi | 86% | 3127 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,128 psi | 85% | 3048 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 55,477 psi | 87% | 3097 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,666 psi | 87% | 3084 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,839 psi | 86% | 3100 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 54,694 psi | 86% | 3091 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,592 psi | 86% | 3179 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 55,564 psi | 87% | 3166 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 94% | 57,638 psi | 90% | 3245 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 94% | 54,940 psi | 86% | 3241 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,638 psi | 90% | 3215 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,521 psi | 87% | 3097 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% | 44,208 psi | 69% | 2877 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 46,412 psi | 73% | 3018 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 48,704 psi | 76% | 3025 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 43,990 psi | 69% | 2963 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 34,867 psi | 55% | 2740 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 94% | 46,398 psi | 73% | 3091 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 29,820 psi | 47% | 2631 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,965 psi | 77% | 3022 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,501 psi | 76% | 3015 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,643 psi | 70% | 2966 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,221 psi | 68% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,536 psi | 59% | 2828 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,676 psi | 78% | 3081 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,324 psi | 69% | 3005 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,572 psi | 75% | 3061 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,223 psi | 71% | 2933 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 41,452 psi | 65% | 2894 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 34,853 psi | 55% | 2749 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 44,643 psi | 70% | 2966 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 35,462 psi | 56% | 2759 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 80% | 46,514 psi | 73% | 2963 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,672 psi | 72% | 2946 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,431 psi | 82% | 2999 fps | 100% |
| Hodgdon Retumbo | 78 gr | 80% | 36,709 psi | 58% | 2877 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,210 psi | 44% | 1837 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,282 psi | 74% | 2949 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 42,728 psi | 67% | 2943 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,289 psi | 57% | 2802 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 37,913 psi | 59% | 2743 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 29,486 psi | 46% | 2628 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 47,616 psi | 75% | 3041 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 42,902 psi | 67% | 2956 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 80% | 38,551 psi | 60% | 2815 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1880 fps | 100% |
| ReloadSwiss RS 76 | 83.4 gr | 80% | 35,998 psi | 56% | 2844 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,609 psi | 61% | 2867 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 49,298 psi | 77% | 2995 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 48,080 psi | 75% | 3005 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,732 psi | 75% | 2999 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,459 psi | 79% | 2982 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 48,515 psi | 76% | 2976 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,351 psi | 66% | 2841 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 51,169 psi | 80% | 3035 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 47,819 psi | 75% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,195 psi | 74% | 3038 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 38,986 psi | 61% | 2831 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 39,784 psi | 62% | 2890 fps | 95.2% |
| Vihtavuori N570 | 91 gr | 90% | 47,239 psi | 74% | 3091 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,163 psi | 66% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,802 psi | 70% | 2904 fps | 99.1% |
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 | 145gr | Hasler ARIETE. Hodgdon Retumbo delivers the highest muzzle velocity at 3,294 fps; across all powders the maximum-charge window runs from 2,051 fps to 3,294 fps. Alliant Reloder-50 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 145.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm KM Katzmaier with the .284 | 145gr | Hasler ARIETE 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.