Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 145gr | Barnes LRX BT 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% | 54,578 psi | 86% | 3054 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 53,838 psi | 84% | 3166 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 55,941 psi | 88% | 3153 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,636 psi | 86% | 3166 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 57,725 psi | 90% | 3205 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 54,157 psi | 85% | 3255 fps | 98.1% |
| ADI AR 2225 | <<locked>> | 98% | 56,739 psi | 89% | 3225 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,057 psi | 88% | 3150 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,434 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,042 psi | 86% | 3159 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,956 psi | 89% | 3120 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,551 psi | 90% | 3196 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,711 psi | 90% | 3209 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,072 psi | 88% | 3235 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,811 psi | 87% | 3219 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,347 psi | 87% | 3123 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 54,447 psi | 85% | 3146 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,261 psi | 90% | 3212 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,042 psi | 86% | 3159 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,114 psi | 86% | 3166 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,261 psi | 90% | 3156 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,275 psi | 88% | 3140 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,043 psi | 88% | 3054 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,014 psi | 89% | 3294 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 59% | 2051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,479 psi | 90% | 3133 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 56,956 psi | 89% | 3212 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,434 psi | 87% | 3199 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 56,347 psi | 88% | 3084 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,927 psi | 89% | 3222 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,129 psi | 86% | 3173 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,230 psi | 85% | 3169 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 90% | 56,913 psi | 89% | 3156 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 2096 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,693 psi | 84% | 3209 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,334 psi | 90% | 3241 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 84% | 56,376 psi | 88% | 3120 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 55,216 psi | 87% | 3130 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,839 psi | 86% | 3127 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,085 psi | 85% | 3048 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 55,448 psi | 87% | 3094 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,622 psi | 87% | 3084 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,984 psi | 86% | 3100 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 54,665 psi | 86% | 3094 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,578 psi | 86% | 3176 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 55,506 psi | 87% | 3166 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 94% | 57,638 psi | 90% | 3245 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 94% | 54,897 psi | 86% | 3238 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,595 psi | 90% | 3212 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,492 psi | 87% | 3094 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% | 44,353 psi | 70% | 2881 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 46,383 psi | 73% | 3018 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 48,689 psi | 76% | 3025 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 43,961 psi | 69% | 2963 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 34,867 psi | 55% | 2740 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 94% | 46,543 psi | 73% | 3097 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 29,820 psi | 47% | 2631 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,139 psi | 77% | 3025 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,646 psi | 76% | 3018 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,643 psi | 70% | 2966 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,366 psi | 68% | 2897 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,521 psi | 59% | 2831 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,632 psi | 78% | 3081 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,454 psi | 70% | 3009 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,718 psi | 75% | 3064 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,194 psi | 71% | 2930 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 41,452 psi | 65% | 2894 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 34,983 psi | 55% | 2753 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 44,643 psi | 70% | 2966 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 35,433 psi | 56% | 2759 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 80% | 46,485 psi | 73% | 2963 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,672 psi | 72% | 2943 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,402 psi | 82% | 2999 fps | 100% |
| Hodgdon Retumbo | 78 gr | 80% | 36,680 psi | 57% | 2874 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1837 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,268 psi | 74% | 2953 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 42,699 psi | 67% | 2940 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,405 psi | 57% | 2805 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 37,898 psi | 59% | 2740 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 29,486 psi | 46% | 2628 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 47,572 psi | 75% | 3041 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,047 psi | 67% | 2956 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 80% | 38,667 psi | 61% | 2818 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 1880 fps | 100% |
| ReloadSwiss RS 76 | 83.5 gr | 80% | 36,129 psi | 57% | 2848 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,595 psi | 60% | 2864 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 49,443 psi | 77% | 2999 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 48,225 psi | 76% | 3005 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,892 psi | 75% | 3002 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,459 psi | 79% | 2986 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 48,515 psi | 76% | 2976 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,482 psi | 67% | 2844 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 51,155 psi | 80% | 3031 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 47,819 psi | 75% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,195 psi | 74% | 3038 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 39,117 psi | 61% | 2835 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 84% | 39,755 psi | 62% | 2887 fps | 95.2% |
| Vihtavuori N570 | 91 gr | 90% | 47,224 psi | 74% | 3087 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,134 psi | 66% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,788 psi | 70% | 2904 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 50 powders for 7 mm KM Katzmaier loaded with the .284 | 145gr | Barnes LRX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,294 fps; across all powders the maximum-charge window runs from 2,051 fps to 3,294 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 145.0 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 | 145gr | Barnes LRX 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.