Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 152gr | Hasler ARIETE bullet and 52 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.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 55,941 psi | 88% | 3018 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 47,703 psi | 75% | 2972 fps | 96.3% |
| Accurate MAGPRO | <<locked>> | 84% | 55,361 psi | 87% | 3133 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 84% | 57,464 psi | 90% | 3117 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,057 psi | 88% | 3130 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 55,216 psi | 87% | 3110 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 55,883 psi | 88% | 3235 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 96% | 54,737 psi | 86% | 3133 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,913 psi | 89% | 3100 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,478 psi | 89% | 3123 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,665 psi | 86% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,361 psi | 87% | 3104 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,288 psi | 87% | 3110 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 53,635 psi | 84% | 3136 fps | 98.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 53,447 psi | 84% | 3123 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,652 psi | 89% | 3094 fps | 98.8% |
| Bofors RP15 | <<locked>> | 88% | 55,854 psi | 88% | 3114 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 55,129 psi | 86% | 3120 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,478 psi | 89% | 3123 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,884 psi | 89% | 3133 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,853 psi | 86% | 3061 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,624 psi | 90% | 3104 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,464 psi | 90% | 3012 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,694 psi | 86% | 3196 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,840 psi | 59% | 2008 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,216 psi | 87% | 3038 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 54,621 psi | 86% | 3114 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 92% | 57,406 psi | 90% | 3041 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,319 psi | 90% | 3169 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 54,375 psi | 85% | 2995 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,723 psi | 86% | 3130 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,652 psi | 89% | 3140 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,927 psi | 88% | 3136 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 54,244 psi | 85% | 3054 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,783 psi | 61% | 2054 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,724 psi | 87% | 3179 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,723 psi | 86% | 3143 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 84% | 57,740 psi | 90% | 3084 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,710 psi | 89% | 3094 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,647 psi | 78% | 2986 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,333 psi | 88% | 3091 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,274 psi | 87% | 3012 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 56,942 psi | 89% | 3058 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,174 psi | 90% | 3048 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,492 psi | 89% | 3074 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 84% | 56,231 psi | 88% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,014 psi | 88% | 3143 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 57,145 psi | 90% | 3136 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 55,201 psi | 87% | 3146 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 94% | 56,826 psi | 89% | 3219 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,216 psi | 87% | 3114 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,884 psi | 89% | 3058 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% | 45,469 psi | 71% | 2844 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 44,222 psi | 69% | 2900 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 80% | 47,877 psi | 75% | 2995 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 80% | 49,995 psi | 78% | 2989 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 45,310 psi | 71% | 2933 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 80% | 33,504 psi | 53% | 2654 fps | 95.4% |
| ADI AR 2218 | 94.4 gr | 92% | 44,527 psi | 70% | 2999 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 30,806 psi | 48% | 2618 fps | 97.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,748 psi | 78% | 2982 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,977 psi | 72% | 2936 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,672 psi | 70% | 2864 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,798 psi | 61% | 2805 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,184 psi | 80% | 3048 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 42,467 psi | 67% | 2913 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,745 psi | 72% | 2972 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,294 psi | 68% | 2838 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 42,685 psi | 67% | 2867 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 36,042 psi | 56% | 2730 fps | 96.6% |
| Bofors RP5 | <<locked>> | 80% | 45,977 psi | 72% | 2936 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 36,564 psi | 57% | 2736 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 47,761 psi | 75% | 2933 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,920 psi | 74% | 2917 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,722 psi | 84% | 2959 fps | 100% |
| Hodgdon Retumbo | 77.5 gr | 80% | 37,971 psi | 60% | 2854 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,384 psi | 44% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,385 psi | 76% | 2917 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 80% | 44,063 psi | 69% | 2917 fps | 98.5% |
| IMR 7977 Enduron | <<locked>> | 90% | 53,766 psi | 84% | 2979 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,041 psi | 55% | 2720 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 39,146 psi | 61% | 2717 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 28,456 psi | 45% | 2549 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 49,066 psi | 77% | 3009 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,411 psi | 70% | 2930 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 80% | 39,914 psi | 63% | 2792 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 46% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,376 psi | 59% | 2828 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 37,086 psi | 58% | 2779 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 50,647 psi | 79% | 2966 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 49,559 psi | 78% | 2972 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 46,195 psi | 72% | 2917 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,211 psi | 77% | 2969 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 51,735 psi | 81% | 2953 fps | 99.3% |
| Somchem S385 | <<locked>> | 80% | 49,777 psi | 78% | 2943 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,497 psi | 68% | 2812 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 49,023 psi | 77% | 2943 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 49,197 psi | 77% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,631 psi | 76% | 3012 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 40,234 psi | 63% | 2812 fps | 97.2% |
| Vihtavuori N568 | <<locked>> | 82% | 38,130 psi | 60% | 2795 fps | 95.1% |
| Vihtavuori N570 | 88.4 gr | 88% | 45,368 psi | 71% | 2999 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,845 psi | 69% | 2930 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,035 psi | 72% | 2874 fps | 99.5% |
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 | 152gr | Hasler ARIETE. ADI AR 2218 delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,235 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 152.0 gr projectile in 0.284" calls for a 1:9.0 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for 7 mm KM Katzmaier with the .284 | 152gr | Hasler ARIETE 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.