Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 140gr | Peregrine VLR-4 bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Alliant Reloder-33 and Hodgdon Retumbo.
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% | 57,276 psi | 90% | 3140 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,753 psi | 89% | 3258 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 84% | 54,984 psi | 86% | 3182 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 88% | 57,566 psi | 90% | 3261 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 96% | 56,405 psi | 88% | 3232 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,290 psi | 90% | 3353 fps | 98.5% |
| ADI AR 2225 | <<locked>> | 98% | 55,463 psi | 87% | 3251 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 54,520 psi | 85% | 3166 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 53,983 psi | 85% | 3186 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,869 psi | 88% | 3153 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,304 psi | 88% | 3225 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,608 psi | 89% | 3241 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 54,766 psi | 86% | 3251 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 3232 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 54,375 psi | 85% | 3150 fps | 97.8% |
| Bofors RP15 | <<locked>> | 90% | 57,043 psi | 89% | 3238 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,188 psi | 88% | 3241 fps | 99.9% |
| Bofors RP5 | <<locked>> | 86% | 53,983 psi | 85% | 3186 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 92% | 53,867 psi | 84% | 3189 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 86% | 56,275 psi | 88% | 3186 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 55,288 psi | 87% | 3166 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 55,172 psi | 86% | 3087 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 55,564 psi | 87% | 3320 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 59% | 2087 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,985 psi | 89% | 3153 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,579 psi | 89% | 3163 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 88% | 55,811 psi | 87% | 3238 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,273 psi | 85% | 3222 fps | 99.7% |
| Lovex S071 | <<locked>> | 92% | 55,506 psi | 87% | 3114 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,608 psi | 87% | 3248 fps | 100% |
| Norma MRP | <<locked>> | 84% | 53,998 psi | 85% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,145 psi | 90% | 3261 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 90% | 55,564 psi | 87% | 3182 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 60% | 2133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,840 psi | 89% | 3304 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,043 psi | 88% | 3261 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 84% | 55,506 psi | 87% | 3150 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 84% | 54,259 psi | 85% | 3159 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,566 psi | 90% | 3215 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,985 psi | 89% | 3140 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 57,145 psi | 90% | 3146 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 54,505 psi | 85% | 3127 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 54,621 psi | 86% | 3114 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 53,838 psi | 84% | 3123 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 86% | 57,348 psi | 90% | 3179 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,377 psi | 90% | 3271 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 90% | 54,549 psi | 85% | 3196 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 94% | 56,420 psi | 88% | 3268 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 94% | 53,722 psi | 84% | 3258 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,101 psi | 88% | 3241 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 54,476 psi | 85% | 3120 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% | 43,381 psi | 68% | 2900 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 45,440 psi | 71% | 3041 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 47,863 psi | 75% | 3051 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 43,134 psi | 68% | 2986 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 84% | 36,651 psi | 57% | 2822 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 94% | 45,571 psi | 71% | 3107 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 80% | 29,182 psi | 46% | 2644 fps | 95.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,688 psi | 75% | 3041 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,787 psi | 69% | 2989 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,395 psi | 66% | 2923 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,724 psi | 58% | 2851 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,530 psi | 76% | 3107 fps | 100% |
| Alliant Reloder-33 | 97.3 gr | 92% | 46,746 psi | 73% | 3097 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 50,299 psi | 79% | 3156 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,469 psi | 70% | 2956 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 40,654 psi | 64% | 2917 fps | 97.9% |
| Bofors RP30 | <<locked>> | 82% | 36,709 psi | 58% | 2838 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 43,787 psi | 69% | 2989 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 34,737 psi | 54% | 2772 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 45,687 psi | 72% | 2986 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,860 psi | 70% | 2969 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,590 psi | 81% | 3031 fps | 100% |
| Hodgdon Retumbo | 78.5 gr | 80% | 35,882 psi | 56% | 2890 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 44% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,461 psi | 84% | 3097 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,572 psi | 73% | 2979 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 41,858 psi | 66% | 2963 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,505 psi | 56% | 2818 fps | 95.2% |
| Lovex S071 | <<locked>> | 80% | 37,202 psi | 58% | 2766 fps | 99% |
| Norma 217 | <<locked>> | 84% | 30,922 psi | 48% | 2710 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 46,615 psi | 73% | 3064 fps | 99.8% |
| Ramshot Grand | <<locked>> | 80% | 41,887 psi | 66% | 2972 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 80% | 37,782 psi | 59% | 2838 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,906 psi | 45% | 1913 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,244 psi | 55% | 2861 fps | 98.3% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 40,828 psi | 64% | 2956 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 48,501 psi | 76% | 3022 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 47,239 psi | 74% | 3031 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,891 psi | 73% | 3025 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 49,647 psi | 78% | 3009 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 53,417 psi | 84% | 3094 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,674 psi | 75% | 3002 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 41,568 psi | 65% | 2867 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 90% | 50,270 psi | 79% | 3054 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 46,949 psi | 74% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,282 psi | 73% | 3061 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 38,145 psi | 60% | 2851 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 86% | 41,930 psi | 66% | 2976 fps | 95.6% |
| Vihtavuori N570 | 93.6 gr | 92% | 49,734 psi | 78% | 3182 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,046 psi | 64% | 2982 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,990 psi | 69% | 2927 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 58 powders for 7 mm KM Katzmaier loaded with the .284 | 140gr | Peregrine VLR-4. ADI AR 2218 delivers the highest muzzle velocity at 3,353 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,353 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 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, Alliant Reloder-50 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, Alliant Reloder-33, Hodgdon Retumbo rank at the top here: for 7 mm KM Katzmaier with the .284 | 140gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 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.