Load Specifications
Load data in caliber 7 mm KM Katzmaier with .283 | 140gr | Rhino Penetrator bullet and 50 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% | 55,927 psi | 88% | 3117 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 54,070 psi | 85% | 3219 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 84% | 55,085 psi | 86% | 3222 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 84% | 56,927 psi | 89% | 3209 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,564 psi | 87% | 3222 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 94% | 54,723 psi | 86% | 3199 fps | 99.8% |
| ADI AR 2218 | <<locked>> | 98% | 55,477 psi | 87% | 3317 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 96% | 54,070 psi | 85% | 3222 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,449 psi | 88% | 3196 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,086 psi | 88% | 3219 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,462 psi | 85% | 3127 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,940 psi | 86% | 3199 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,868 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,580 psi | 90% | 3297 fps | 98.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,479 psi | 90% | 3281 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,086 psi | 88% | 3176 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 55,492 psi | 87% | 3205 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,737 psi | 86% | 3212 fps | 99.8% |
| Bofors RP5 | <<locked>> | 86% | 56,086 psi | 88% | 3219 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,159 psi | 88% | 3222 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,505 psi | 85% | 3150 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,174 psi | 90% | 3196 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,101 psi | 89% | 3110 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,012 psi | 85% | 3284 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,710 psi | 59% | 2090 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,810 psi | 86% | 3130 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 86% | 54,172 psi | 85% | 3205 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,956 psi | 89% | 3261 fps | 99.9% |
| Lovex S071 | <<locked>> | 90% | 54,259 psi | 85% | 3091 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,447 psi | 85% | 3222 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,217 psi | 88% | 3232 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,434 psi | 87% | 3228 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 88% | 53,954 psi | 85% | 3150 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,798 psi | 61% | 2139 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,027 psi | 86% | 3271 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,520 psi | 85% | 3232 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 84% | 57,145 psi | 90% | 3176 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 56,318 psi | 88% | 3189 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,941 psi | 88% | 3186 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,955 psi | 86% | 3100 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 56,594 psi | 89% | 3156 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,768 psi | 89% | 3143 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,188 psi | 88% | 3159 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 56,086 psi | 88% | 3153 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,579 psi | 87% | 3235 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 90% | 57,000 psi | 89% | 3228 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 54,882 psi | 86% | 3235 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 94% | 56,318 psi | 88% | 3304 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,810 psi | 86% | 3212 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,449 psi | 88% | 3150 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% | 45,687 psi | 72% | 2940 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 50,299 psi | 79% | 3146 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 80% | 47,732 psi | 75% | 3084 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 49,617 psi | 78% | 3081 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 44,904 psi | 70% | 3018 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 35,969 psi | 56% | 2799 fps | 95.7% |
| ADI AR 2218 | 99.1 gr | 94% | 47,718 psi | 75% | 3156 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 30,864 psi | 48% | 2694 fps | 96.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,588 psi | 78% | 3074 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,701 psi | 72% | 3025 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,367 psi | 70% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,595 psi | 60% | 2890 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,937 psi | 80% | 3140 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,701 psi | 72% | 3068 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 49,313 psi | 77% | 3127 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 46,108 psi | 72% | 2986 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 42,540 psi | 67% | 2956 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 36,172 psi | 57% | 2818 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 45,701 psi | 72% | 3025 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 36,390 psi | 57% | 2815 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 80% | 47,384 psi | 74% | 3018 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,586 psi | 73% | 3002 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,490 psi | 84% | 3058 fps | 100% |
| Hodgdon Retumbo | 79.6 gr | 80% | 37,753 psi | 59% | 2936 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,398 psi | 45% | 1877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,124 psi | 75% | 3005 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 43,714 psi | 69% | 3002 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 86% | 35,114 psi | 55% | 2802 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 39,349 psi | 62% | 2808 fps | 99.4% |
| Norma 217 | <<locked>> | 82% | 30,719 psi | 48% | 2697 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 48,776 psi | 76% | 3104 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 44,092 psi | 69% | 3015 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 80% | 39,885 psi | 63% | 2881 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,138 psi | 46% | 1919 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,304 psi | 58% | 2910 fps | 99% |
| ReloadSwiss RS 80 | 90.2 gr | 84% | 40,059 psi | 63% | 2933 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 50,169 psi | 79% | 3051 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 49,284 psi | 77% | 3068 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,936 psi | 77% | 3061 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 51,416 psi | 81% | 3038 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 49,588 psi | 78% | 3035 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 43,497 psi | 68% | 2904 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 52,388 psi | 82% | 3094 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 49,124 psi | 77% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,312 psi | 76% | 3097 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 40,292 psi | 63% | 2897 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 41,031 psi | 64% | 2953 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 90% | 48,559 psi | 76% | 3153 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,424 psi | 68% | 3022 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,905 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 58 powders for 7 mm KM Katzmaier loaded with the .283 | 140gr | Rhino Penetrator. ADI AR 2218 delivers the highest muzzle velocity at 3,317 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,317 fps. Accurate 8700 gives the best case fill at 100 %, and 58 of the 58 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 0.283" calls for a 1:10.5 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 .283 | 140gr | Rhino Penetrator 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.