Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 144gr | Peregrine VLR-5 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% | 54,665 psi | 86% | 3068 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 54,955 psi | 86% | 3186 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 84% | 56,057 psi | 88% | 3163 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 54,708 psi | 86% | 3179 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 96% | 57,740 psi | 90% | 3219 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 54,317 psi | 85% | 3268 fps | 98.2% |
| ADI AR 2225 | <<locked>> | 98% | 56,927 psi | 89% | 3235 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,550 psi | 87% | 3150 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,114 psi | 86% | 3169 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,043 psi | 89% | 3133 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,609 psi | 90% | 3205 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 53,722 psi | 84% | 3159 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 56,202 psi | 88% | 3248 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3225 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 55,361 psi | 87% | 3136 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 54,534 psi | 85% | 3159 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,493 psi | 90% | 3228 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,114 psi | 86% | 3169 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,361 psi | 87% | 3179 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 57,363 psi | 90% | 3166 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,362 psi | 88% | 3153 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,217 psi | 88% | 3064 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,058 psi | 89% | 3304 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 59% | 2060 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,913 psi | 89% | 3107 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,551 psi | 90% | 3143 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 57,043 psi | 89% | 3222 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,637 psi | 87% | 3212 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 56,637 psi | 89% | 3097 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 3235 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,201 psi | 87% | 3186 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,246 psi | 90% | 3228 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,418 psi | 85% | 3127 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 2106 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 53,940 psi | 85% | 3222 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,508 psi | 90% | 3255 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 84% | 56,492 psi | 89% | 3133 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 84% | 55,332 psi | 87% | 3143 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 54,955 psi | 86% | 3136 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 54,143 psi | 85% | 3058 fps | 99.3% |
| Somchem S385 | <<locked>> | 84% | 55,535 psi | 87% | 3107 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,695 psi | 87% | 3094 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 54,940 psi | 86% | 3110 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 54,810 psi | 86% | 3104 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 54,636 psi | 86% | 3189 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 90% | 55,753 psi | 87% | 3179 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 92% | 53,606 psi | 84% | 3186 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 94% | 55,100 psi | 86% | 3251 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,667 psi | 90% | 3222 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,753 psi | 89% | 3123 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% | 44,309 psi | 69% | 2887 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 44,005 psi | 69% | 2969 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 48,820 psi | 77% | 3038 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 44,092 psi | 69% | 2972 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 34,940 psi | 55% | 2749 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 94% | 46,688 psi | 73% | 3107 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 29,892 psi | 47% | 2641 fps | 96.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,602 psi | 76% | 3028 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,744 psi | 70% | 2976 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,352 psi | 68% | 2907 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,637 psi | 59% | 2841 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,748 psi | 78% | 3091 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,454 psi | 70% | 3018 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 47,834 psi | 75% | 3074 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 45,281 psi | 71% | 2940 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 41,553 psi | 65% | 2904 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 34,954 psi | 55% | 2759 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 44,744 psi | 70% | 2976 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 33,475 psi | 52% | 2710 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 40,944 psi | 64% | 2851 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,759 psi | 72% | 2956 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,576 psi | 82% | 3012 fps | 100% |
| Hodgdon Retumbo | 78.5 gr | 80% | 36,796 psi | 58% | 2887 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 44% | 1847 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,922 psi | 78% | 2995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,384 psi | 74% | 2963 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 45,629 psi | 72% | 3012 fps | 98.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 36,477 psi | 57% | 2815 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 38,029 psi | 60% | 2753 fps | 99.3% |
| Norma 217 | <<locked>> | 82% | 29,573 psi | 46% | 2638 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 47,688 psi | 75% | 3051 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 48,820 psi | 77% | 3081 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 80% | 42,801 psi | 67% | 2917 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,979 psi | 45% | 1890 fps | 100% |
| ReloadSwiss RS 76 | 84 gr | 80% | 36,187 psi | 57% | 2854 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,783 psi | 61% | 2877 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 49,385 psi | 77% | 3005 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 48,196 psi | 76% | 3015 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,863 psi | 75% | 3012 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 50,531 psi | 79% | 2995 fps | 98.8% |
| Somchem S385 | <<locked>> | 80% | 48,602 psi | 76% | 2989 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,424 psi | 66% | 2854 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 51,314 psi | 80% | 3045 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 47,964 psi | 75% | 2992 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,297 psi | 74% | 3048 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 39,059 psi | 61% | 2841 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 39,827 psi | 62% | 2897 fps | 95.2% |
| Vihtavuori N570 | 91.6 gr | 90% | 47,427 psi | 74% | 3100 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,250 psi | 66% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,081 psi | 77% | 2995 fps | 99.6% |
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 | 144gr | Peregrine VLR-5. Hodgdon Retumbo delivers the highest muzzle velocity at 3,304 fps; across all powders the maximum-charge window runs from 2,060 fps to 3,304 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 144.0 gr projectile in 0.284" calls for a 1:9.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm KM Katzmaier with the .284 | 144gr | Peregrine VLR-5 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.