Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Sierra Pro-Hunter bullet and 49 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 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 3100 | <<locked>> | 86% | 57,363 psi | 90% | 3136 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 56,463 psi | 88% | 3248 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 82% | 54,433 psi | 85% | 3169 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 86% | 56,971 psi | 89% | 3245 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 94% | 56,304 psi | 88% | 3222 fps | 99.9% |
| ADI AR 2218 | <<locked>> | 98% | 57,319 psi | 90% | 3350 fps | 98.7% |
| ADI AR 2225 | <<locked>> | 96% | 55,869 psi | 88% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,638 psi | 90% | 3215 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,522 psi | 90% | 3238 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 55,767 psi | 87% | 3143 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 56,405 psi | 88% | 3219 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,420 psi | 88% | 3228 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,042 psi | 86% | 3251 fps | 97.9% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,230 psi | 87% | 3238 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,319 psi | 90% | 3199 fps | 98.5% |
| Bofors RP15 | <<locked>> | 88% | 56,898 psi | 89% | 3225 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 56,260 psi | 88% | 3235 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 57,522 psi | 90% | 3238 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 53,766 psi | 84% | 3179 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 84% | 55,666 psi | 87% | 3169 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 84% | 54,752 psi | 86% | 3153 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 90% | 55,869 psi | 88% | 3310 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,884 psi | 59% | 2100 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 55,941 psi | 88% | 3150 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 86% | 55,419 psi | 87% | 3225 fps | 99.7% |
| IMR 8133 Enduron | <<locked>> | 98% | 54,766 psi | 86% | 3219 fps | 99.8% |
| Lovex S071 | <<locked>> | 90% | 55,680 psi | 87% | 3110 fps | 100% |
| Norma 217 | <<locked>> | 98% | 56,289 psi | 88% | 3248 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,696 psi | 90% | 3255 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 57,000 psi | 89% | 3255 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 88% | 55,492 psi | 87% | 3173 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,798 psi | 61% | 2146 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,884 psi | 89% | 3291 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,188 psi | 88% | 3255 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 82% | 54,665 psi | 86% | 3133 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 57,595 psi | 90% | 3209 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 3091 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,217 psi | 90% | 3205 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,130 psi | 88% | 3120 fps | 99.5% |
| Somchem S385 | <<locked>> | 82% | 54,186 psi | 85% | 3114 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 54,389 psi | 85% | 3104 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,624 psi | 90% | 3182 fps | 97% |
| Vihtavuori N555 | <<locked>> | 84% | 57,464 psi | 90% | 3173 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 57,000 psi | 89% | 3258 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 88% | 54,621 psi | 86% | 3189 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 92% | 56,579 psi | 89% | 3261 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 92% | 54,012 psi | 85% | 3258 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 56,536 psi | 89% | 3232 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,012 psi | 85% | 3110 fps | 99.9% |
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% | 46,760 psi | 73% | 2959 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 48,950 psi | 77% | 3107 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 80% | 50,879 psi | 80% | 3104 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 46,122 psi | 72% | 3041 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 34,345 psi | 54% | 2756 fps | 95% |
| ADI AR 2218 | 99.1 gr | 92% | 45,672 psi | 72% | 3107 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 31,691 psi | 50% | 2720 fps | 97.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,618 psi | 79% | 3094 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,905 psi | 74% | 3048 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,513 psi | 71% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,842 psi | 62% | 2913 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,475 psi | 82% | 3163 fps | 100% |
| Alliant Reloder-33 | 98.7 gr | 90% | 47,253 psi | 74% | 3097 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 94% | 47,427 psi | 74% | 3087 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,019 psi | 69% | 2940 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 43,584 psi | 68% | 2976 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 37,173 psi | 58% | 2838 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 46,905 psi | 74% | 3048 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 37,463 psi | 59% | 2841 fps | 97% |
| Hodgdon H4831 | <<locked>> | 80% | 48,515 psi | 76% | 3041 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,732 psi | 75% | 3022 fps | 98.2% |
| Hodgdon Retumbo | <<locked>> | 80% | 38,798 psi | 61% | 2963 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,471 psi | 45% | 1883 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,211 psi | 77% | 3028 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 44,802 psi | 70% | 3022 fps | 98.2% |
| IMR 8133 Enduron | <<locked>> | 86% | 36,245 psi | 57% | 2828 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 40,263 psi | 63% | 2828 fps | 99.6% |
| Norma 217 | <<locked>> | 82% | 31,836 psi | 50% | 2723 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 50,067 psi | 78% | 3123 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,426 psi | 71% | 3041 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 80% | 41,060 psi | 64% | 2900 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,211 psi | 46% | 1926 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,537 psi | 60% | 2936 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 41,292 psi | 65% | 2956 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 80% | 51,358 psi | 80% | 3074 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 50,401 psi | 79% | 3084 fps | 99.7% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,659 psi | 75% | 3025 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,053 psi | 78% | 3081 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 52,576 psi | 82% | 3058 fps | 99.1% |
| Somchem S385 | <<locked>> | 80% | 50,763 psi | 80% | 3054 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 44,483 psi | 70% | 2920 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 88% | 50,328 psi | 79% | 3051 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 50,314 psi | 79% | 3058 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,530 psi | 78% | 3120 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 41,423 psi | 65% | 2920 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 42,322 psi | 66% | 2979 fps | 95.9% |
| Vihtavuori N570 | 92.9 gr | 88% | 46,702 psi | 73% | 3110 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,860 psi | 70% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,876 psi | 73% | 2979 fps | 99.3% |
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 57 powders for 7 mm KM Katzmaier loaded with the .284 | 140gr | Sierra Pro-Hunter. ADI AR 2218 delivers the highest muzzle velocity at 3,350 fps; across all powders the maximum-charge window runs from 2,100 fps to 3,350 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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 140.0 gr projectile in 0.284" calls for a 1:12.5 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, Alliant Reloder-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 140gr | Sierra Pro-Hunter they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, IMR 7977 Enduron, Lovex D100 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.