Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Barnes TTSX BT bullet and 52 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>> | 88% | 57,595 psi | 90% | 3146 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,898 psi | 89% | 3261 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 84% | 55,114 psi | 86% | 3182 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 57,696 psi | 90% | 3261 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 56,724 psi | 89% | 3235 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,580 psi | 90% | 3360 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 98% | 55,782 psi | 87% | 3255 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 55,245 psi | 87% | 3176 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,665 psi | 86% | 3169 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 54,085 psi | 85% | 3186 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,985 psi | 88% | 3153 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,637 psi | 89% | 3228 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,753 psi | 89% | 3238 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,882 psi | 86% | 3251 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 3238 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,476 psi | 85% | 3150 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 57,363 psi | 90% | 3241 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,289 psi | 88% | 3241 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 54,085 psi | 85% | 3186 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 53,983 psi | 85% | 3189 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,579 psi | 89% | 3186 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,419 psi | 87% | 3166 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,317 psi | 87% | 3087 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,898 psi | 88% | 3320 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,695 psi | 59% | 2087 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,101 psi | 89% | 3156 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,681 psi | 89% | 3163 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 55,927 psi | 88% | 3241 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,549 psi | 85% | 3225 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 55,608 psi | 87% | 3117 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3248 fps | 100% |
| Norma MRP | <<locked>> | 84% | 54,128 psi | 85% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,305 psi | 90% | 3264 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 55,912 psi | 88% | 3182 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,580 psi | 60% | 2133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,985 psi | 89% | 3304 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,144 psi | 88% | 3261 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 55,622 psi | 87% | 3153 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 54,375 psi | 85% | 3159 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,012 psi | 85% | 3156 fps | 99.9% |
| Somchem S361 | <<locked>> | 84% | 57,116 psi | 90% | 3140 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 57,334 psi | 90% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,607 psi | 86% | 3127 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,911 psi | 86% | 3114 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,128 psi | 85% | 3127 fps | 96% |
| Vihtavuori N555 | <<locked>> | 86% | 57,696 psi | 90% | 3182 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,682 psi | 90% | 3271 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 54,650 psi | 86% | 3192 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 56,536 psi | 89% | 3268 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 53,838 psi | 84% | 3261 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,463 psi | 88% | 3245 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,621 psi | 86% | 3123 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% | 43,511 psi | 68% | 2904 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 45,730 psi | 72% | 3045 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 47,993 psi | 75% | 3054 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 43,250 psi | 68% | 2989 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 84% | 36,753 psi | 58% | 2825 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 94% | 45,658 psi | 72% | 3107 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 29,283 psi | 46% | 2648 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,254 psi | 76% | 3051 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,805 psi | 75% | 3045 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,903 psi | 69% | 2992 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,525 psi | 67% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,840 psi | 58% | 2851 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,660 psi | 76% | 3107 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 47,021 psi | 74% | 3100 fps | 95.7% |
| Alliant Reloder-50 | <<locked>> | 98% | 50,401 psi | 79% | 3153 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,541 psi | 70% | 2956 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 40,785 psi | 64% | 2917 fps | 97.9% |
| Bofors RP30 | <<locked>> | 82% | 36,854 psi | 58% | 2841 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 43,903 psi | 69% | 2992 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 34,838 psi | 55% | 2776 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 45,803 psi | 72% | 2989 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,976 psi | 70% | 2972 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,735 psi | 81% | 3035 fps | 100% |
| Hodgdon Retumbo | 78.7 gr | 80% | 36,013 psi | 56% | 2894 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,239 psi | 44% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,592 psi | 84% | 3097 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,673 psi | 73% | 2979 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 41,989 psi | 66% | 2966 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,607 psi | 56% | 2822 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 37,347 psi | 59% | 2769 fps | 99% |
| Norma 217 | <<locked>> | 84% | 31,038 psi | 49% | 2710 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 46,746 psi | 73% | 3068 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 42,206 psi | 66% | 2979 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 80% | 37,927 psi | 59% | 2838 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 45% | 1916 fps | 100% |
| ReloadSwiss RS 76 | 84.2 gr | 80% | 35,375 psi | 55% | 2861 fps | 98.3% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 40,959 psi | 64% | 2959 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 48,617 psi | 76% | 3025 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 47,369 psi | 74% | 3031 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,021 psi | 74% | 3025 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 49,734 psi | 78% | 3009 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 53,577 psi | 84% | 3094 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,790 psi | 75% | 3005 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 41,684 psi | 65% | 2867 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 90% | 50,357 psi | 79% | 3054 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 47,079 psi | 74% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,398 psi | 73% | 3061 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 38,392 psi | 60% | 2854 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 86% | 42,032 psi | 66% | 2979 fps | 95.7% |
| Vihtavuori N570 | 93.9 gr | 92% | 50,038 psi | 78% | 3186 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,176 psi | 65% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,106 psi | 69% | 2930 fps | 98.8% |
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 52 powders for 7 mm KM Katzmaier loaded with the .284 | 140gr | Barnes TTSX BT. ADI AR 2218 delivers the highest muzzle velocity at 3,360 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,360 fps. ADI AR 2218 gives the best case fill at 100 %, and 52 of the 52 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. ADI AR 2218, 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm KM Katzmaier with the .284 | 140gr | Barnes TTSX BT 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.