Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Sierra GameKing bullet and 49 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 ReloadSwiss RS 80.
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% | 55,869 psi | 88% | 3117 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,969 psi | 86% | 3225 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 56,855 psi | 89% | 3209 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,448 psi | 87% | 3222 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 54,636 psi | 86% | 3199 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 55,390 psi | 87% | 3320 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 96% | 53,954 psi | 85% | 3222 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,333 psi | 88% | 3196 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,970 psi | 88% | 3215 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,346 psi | 85% | 3123 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,839 psi | 86% | 3199 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,955 psi | 86% | 3209 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,479 psi | 90% | 3297 fps | 98.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 3284 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,014 psi | 88% | 3176 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 55,564 psi | 87% | 3209 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,839 psi | 86% | 3215 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 55,970 psi | 88% | 3215 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,043 psi | 88% | 3222 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,433 psi | 85% | 3150 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,087 psi | 89% | 3196 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,971 psi | 89% | 3110 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,143 psi | 85% | 3287 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 59% | 2090 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,752 psi | 86% | 3130 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 86% | 54,056 psi | 85% | 3205 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,840 psi | 89% | 3261 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 54,157 psi | 85% | 3091 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,360 psi | 85% | 3222 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,304 psi | 88% | 3235 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,303 psi | 87% | 3228 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 88% | 53,867 psi | 84% | 3150 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,827 psi | 61% | 2139 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,129 psi | 86% | 3274 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,418 psi | 85% | 3232 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 57,261 psi | 90% | 3176 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 56,217 psi | 88% | 3189 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,869 psi | 88% | 3186 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,071 psi | 86% | 3104 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,681 psi | 89% | 3156 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,681 psi | 89% | 3140 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,086 psi | 88% | 3159 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 55,970 psi | 88% | 3156 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,666 psi | 87% | 3235 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 56,898 psi | 89% | 3232 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 54,810 psi | 86% | 3238 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 56,275 psi | 88% | 3304 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,665 psi | 86% | 3215 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,550 psi | 89% | 3153 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% | 45,614 psi | 71% | 2943 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 47,630 psi | 75% | 3084 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 49,690 psi | 78% | 3084 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 44,976 psi | 70% | 3022 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 35,868 psi | 56% | 2799 fps | 95.6% |
| ADI AR 2218 | 99 gr | 94% | 47,630 psi | 75% | 3156 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 30,806 psi | 48% | 2697 fps | 96.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,487 psi | 78% | 3074 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,759 psi | 72% | 3025 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,425 psi | 70% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,653 psi | 61% | 2894 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,836 psi | 80% | 3143 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,658 psi | 72% | 3068 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 49,240 psi | 77% | 3130 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,021 psi | 72% | 2986 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 42,453 psi | 67% | 2953 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 36,071 psi | 57% | 2818 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 45,759 psi | 72% | 3025 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 36,448 psi | 57% | 2818 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 80% | 47,471 psi | 74% | 3022 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,644 psi | 73% | 3002 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,403 psi | 84% | 3058 fps | 100% |
| Hodgdon Retumbo | 79.5 gr | 80% | 37,681 psi | 59% | 2936 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 45% | 1877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,196 psi | 76% | 3009 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 43,613 psi | 68% | 2999 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,056 psi | 55% | 2805 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 39,276 psi | 62% | 2808 fps | 99.4% |
| Norma 217 | <<locked>> | 82% | 30,647 psi | 48% | 2694 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 48,704 psi | 76% | 3104 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,990 psi | 69% | 3015 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 80% | 39,784 psi | 62% | 2877 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 46% | 1923 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,231 psi | 58% | 2910 fps | 98.9% |
| ReloadSwiss RS 80 | 90.1 gr | 84% | 40,016 psi | 63% | 2933 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 50,270 psi | 79% | 3054 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 49,182 psi | 77% | 3064 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,834 psi | 77% | 3061 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 51,488 psi | 81% | 3041 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 49,661 psi | 78% | 3035 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 43,424 psi | 68% | 2904 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 52,344 psi | 82% | 3094 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 49,037 psi | 77% | 3041 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,240 psi | 76% | 3097 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 40,234 psi | 63% | 2897 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 40,973 psi | 64% | 2949 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 90% | 48,486 psi | 76% | 3153 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,439 psi | 68% | 3025 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,832 psi | 72% | 2963 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 57 powders for 7 mm KM Katzmaier loaded with the .284 | 140gr | Sierra GameKing. ADI AR 2218 delivers the highest muzzle velocity at 3,320 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,320 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 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Hodgdon TrailBoss 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, ReloadSwiss RS 80 rank at the top here: for 7 mm KM Katzmaier with the .284 | 140gr | Sierra GameKing 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.