Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Frontier BTSP 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% | 55,143 psi | 86% | 3107 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 54,099 psi | 85% | 3209 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 84% | 56,086 psi | 88% | 3199 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,708 psi | 86% | 3209 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 96% | 57,667 psi | 90% | 3248 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 54,288 psi | 85% | 3297 fps | 97.9% |
| ADI AR 2225 | <<locked>> | 98% | 56,869 psi | 89% | 3271 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,217 psi | 88% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,651 psi | 87% | 3182 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,259 psi | 87% | 3205 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 56,971 psi | 89% | 3166 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,653 psi | 90% | 3241 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,954 psi | 85% | 3196 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,115 psi | 88% | 3274 fps | 98% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,246 psi | 88% | 3268 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,317 psi | 87% | 3166 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 54,679 psi | 86% | 3196 fps | 99.9% |
| Bofors RP30 | <<locked>> | 94% | 57,638 psi | 90% | 3261 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 55,259 psi | 87% | 3205 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 55,143 psi | 86% | 3209 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,392 psi | 90% | 3202 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,405 psi | 88% | 3182 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,362 psi | 88% | 3100 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,942 psi | 89% | 3340 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 59% | 2087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,595 psi | 90% | 3176 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 88% | 57,014 psi | 89% | 3258 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,767 psi | 87% | 3245 fps | 99.8% |
| Lovex S071 | <<locked>> | 92% | 56,855 psi | 89% | 3133 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,087 psi | 89% | 3271 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,347 psi | 87% | 3222 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 54,331 psi | 85% | 3212 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 90% | 56,985 psi | 89% | 3199 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 61% | 2133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,766 psi | 84% | 3255 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,406 psi | 90% | 3284 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 56,536 psi | 89% | 3166 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 84% | 55,477 psi | 87% | 3179 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,100 psi | 86% | 3173 fps | 99.9% |
| Somchem S361 | <<locked>> | 82% | 54,317 psi | 85% | 3091 fps | 99.2% |
| Somchem S385 | <<locked>> | 84% | 55,811 psi | 87% | 3143 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,840 psi | 88% | 3127 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,216 psi | 87% | 3146 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 55,158 psi | 86% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,752 psi | 86% | 3222 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 90% | 55,840 psi | 88% | 3212 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 94% | 57,711 psi | 90% | 3287 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 94% | 54,984 psi | 86% | 3284 fps | 97.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 53,519 psi | 84% | 3199 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,709 psi | 87% | 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% | 44,904 psi | 70% | 2930 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 46,760 psi | 73% | 3068 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 48,965 psi | 77% | 3071 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 44,251 psi | 69% | 3009 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 35,288 psi | 55% | 2785 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 94% | 46,673 psi | 73% | 3133 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 30,255 psi | 47% | 2680 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,226 psi | 77% | 3071 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,762 psi | 76% | 3061 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,034 psi | 71% | 3012 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,656 psi | 68% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,956 psi | 59% | 2881 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,024 psi | 78% | 3130 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,701 psi | 70% | 3051 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 96% | 48,138 psi | 75% | 3110 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,353 psi | 71% | 2972 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 41,887 psi | 66% | 2943 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 35,433 psi | 56% | 2802 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 45,034 psi | 71% | 3012 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 35,839 psi | 56% | 2802 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 80% | 46,775 psi | 73% | 3005 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,963 psi | 72% | 2992 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,765 psi | 83% | 3048 fps | 100% |
| Hodgdon Retumbo | 78.4 gr | 80% | 36,985 psi | 58% | 2920 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1870 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,543 psi | 75% | 2995 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 80% | 42,873 psi | 67% | 2986 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,767 psi | 58% | 2854 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 38,696 psi | 61% | 2795 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 30,023 psi | 47% | 2680 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 47,935 psi | 75% | 3091 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 43,207 psi | 68% | 3002 fps | 98% |
| Ramshot Magnum | <<locked>> | 80% | 38,972 psi | 61% | 2864 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,080 psi | 46% | 1916 fps | 100% |
| ReloadSwiss RS 76 | 83.9 gr | 80% | 36,463 psi | 57% | 2890 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 39,218 psi | 61% | 2920 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 49,545 psi | 78% | 3041 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 48,414 psi | 76% | 3051 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,109 psi | 75% | 3045 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 50,720 psi | 79% | 3028 fps | 98.7% |
| Somchem S385 | <<locked>> | 80% | 48,965 psi | 77% | 3025 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 42,757 psi | 67% | 2890 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 51,634 psi | 81% | 3081 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 48,399 psi | 76% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,500 psi | 74% | 3084 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 39,537 psi | 62% | 2884 fps | 96.2% |
| Vihtavuori N568 | <<locked>> | 84% | 40,176 psi | 63% | 2933 fps | 95% |
| Vihtavuori N570 | 91.6 gr | 90% | 47,630 psi | 75% | 3136 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,540 psi | 67% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,179 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 | Frontier BTSP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,340 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,340 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 1:9.0 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 | Frontier BTSP 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.