Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Barnes Solid 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% | 55,303 psi | 87% | 3107 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,244 psi | 85% | 3209 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 56,289 psi | 88% | 3202 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,868 psi | 86% | 3209 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 94% | 53,925 psi | 85% | 3186 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 54,636 psi | 86% | 3304 fps | 98% |
| ADI AR 2225 | <<locked>> | 98% | 57,261 psi | 90% | 3274 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,391 psi | 88% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,811 psi | 87% | 3186 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,448 psi | 87% | 3205 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,392 psi | 90% | 3169 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,099 psi | 85% | 3186 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,186 psi | 85% | 3199 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,652 psi | 89% | 3284 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 3268 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,434 psi | 87% | 3166 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 54,868 psi | 86% | 3196 fps | 99.9% |
| Bofors RP30 | <<locked>> | 92% | 54,114 psi | 85% | 3202 fps | 99.7% |
| Bofors RP5 | <<locked>> | 86% | 55,448 psi | 87% | 3205 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,521 psi | 87% | 3212 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 53,896 psi | 84% | 3140 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,579 psi | 89% | 3186 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,550 psi | 89% | 3104 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,363 psi | 90% | 3343 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 59% | 2087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,740 psi | 90% | 3179 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 57,217 psi | 90% | 3258 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,130 psi | 88% | 3248 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 57,261 psi | 90% | 3136 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,421 psi | 90% | 3271 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,535 psi | 87% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,520 psi | 85% | 3212 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 57,377 psi | 90% | 3202 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,696 psi | 61% | 2133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 54,114 psi | 85% | 3258 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 53,577 psi | 84% | 3215 fps | 99% |
| Rottweil R 904 | <<locked>> | 84% | 56,739 psi | 89% | 3169 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 55,637 psi | 87% | 3179 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,245 psi | 87% | 3173 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,447 psi | 85% | 3091 fps | 99.2% |
| Somchem S385 | <<locked>> | 84% | 55,970 psi | 88% | 3143 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,202 psi | 88% | 3133 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,506 psi | 87% | 3146 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 55,361 psi | 87% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,911 psi | 86% | 3222 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 56,188 psi | 88% | 3219 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 92% | 54,128 psi | 85% | 3222 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 94% | 55,347 psi | 87% | 3287 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,795 psi | 84% | 3202 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,869 psi | 88% | 3140 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% | 45,063 psi | 71% | 2930 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 47,108 psi | 74% | 3074 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 49,153 psi | 77% | 3071 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 44,425 psi | 70% | 3009 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 35,447 psi | 56% | 2785 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 94% | 46,963 psi | 74% | 3136 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 30,400 psi | 48% | 2680 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,429 psi | 77% | 3071 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,965 psi | 77% | 3061 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,208 psi | 71% | 3015 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,874 psi | 69% | 2946 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,130 psi | 60% | 2881 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,241 psi | 79% | 3133 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,020 psi | 71% | 3058 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,457 psi | 76% | 3114 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,484 psi | 71% | 2972 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 42,061 psi | 66% | 2946 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 35,592 psi | 56% | 2802 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 45,208 psi | 71% | 3015 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 36,013 psi | 56% | 2805 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 46,949 psi | 74% | 3009 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,137 psi | 72% | 2992 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,968 psi | 83% | 3048 fps | 100% |
| Hodgdon Retumbo | 78.7 gr | 80% | 37,173 psi | 58% | 2923 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 44% | 1873 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,703 psi | 75% | 2999 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 43,221 psi | 68% | 2992 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 88% | 37,072 psi | 58% | 2858 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 38,870 psi | 61% | 2799 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 30,298 psi | 47% | 2687 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 48,153 psi | 75% | 3091 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,395 psi | 68% | 3002 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 80% | 39,291 psi | 62% | 2867 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 46% | 1916 fps | 100% |
| ReloadSwiss RS 76 | 84.3 gr | 80% | 36,753 psi | 58% | 2897 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,363 psi | 62% | 2917 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,719 psi | 78% | 3041 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 48,631 psi | 76% | 3054 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,298 psi | 76% | 3048 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 50,879 psi | 80% | 3028 fps | 98.7% |
| Somchem S385 | <<locked>> | 80% | 49,124 psi | 77% | 3028 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,917 psi | 67% | 2890 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 51,764 psi | 81% | 3077 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 48,588 psi | 76% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,659 psi | 75% | 3087 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 39,726 psi | 62% | 2887 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 40,495 psi | 63% | 2940 fps | 95.1% |
| Vihtavuori N570 | 91.9 gr | 90% | 47,790 psi | 75% | 3140 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,830 psi | 67% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,324 psi | 71% | 2949 fps | 99% |
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 | 140gr | Barnes Solid. Hodgdon Retumbo delivers the highest muzzle velocity at 3,343 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,343 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 140.0 gr projectile in 0.284" calls for a 1:9.5 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 | 140gr | Barnes Solid 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.