Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 161gr | 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 ADI AR 2218, Vihtavuori N570 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>> | 84% | 53,998 psi | 85% | 2917 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 49,748 psi | 78% | 2946 fps | 97.4% |
| Accurate MAGPRO | <<locked>> | 84% | 57,159 psi | 90% | 3094 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 55,100 psi | 86% | 3005 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 53,925 psi | 85% | 3025 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 57,246 psi | 90% | 3068 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 53,838 psi | 84% | 3133 fps | 98.9% |
| ADI AR 2225 | <<locked>> | 96% | 56,782 psi | 89% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 54,868 psi | 86% | 2995 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 54,389 psi | 85% | 3015 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 56,492 psi | 89% | 2976 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 57,290 psi | 90% | 3058 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 57,217 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 55,738 psi | 87% | 3107 fps | 98.9% |
| Alliant Reloder-50 | <<locked>> | 98% | 55,550 psi | 87% | 3094 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 54,375 psi | 85% | 2989 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 54,027 psi | 85% | 3012 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 57,101 psi | 89% | 3081 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 54,389 psi | 85% | 3015 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 54,636 psi | 86% | 3025 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 56,579 psi | 89% | 3015 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 55,361 psi | 87% | 2995 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 56,927 psi | 89% | 3153 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,855 psi | 59% | 1952 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 56,521 psi | 89% | 2989 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 86% | 56,391 psi | 88% | 3071 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 55,172 psi | 86% | 2940 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 98% | 55,593 psi | 87% | 3071 fps | 100% |
| Lovex S071 | <<locked>> | 90% | 55,970 psi | 88% | 2946 fps | 100% |
| Norma 217 | <<locked>> | 98% | 57,058 psi | 89% | 3094 fps | 100% |
| Norma MRP | <<locked>> | 82% | 54,636 psi | 86% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 53,664 psi | 84% | 3028 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 56,246 psi | 88% | 3015 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,827 psi | 61% | 1998 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 53,679 psi | 84% | 3074 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 56,840 psi | 89% | 3107 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 82% | 55,390 psi | 87% | 2976 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 54,665 psi | 86% | 2989 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 51,532 psi | 81% | 2956 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 54,302 psi | 85% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 56,898 psi | 89% | 2966 fps | 99.9% |
| Somchem S385 | <<locked>> | 82% | 54,752 psi | 86% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,042 psi | 86% | 2946 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 54,230 psi | 85% | 2972 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 82% | 54,288 psi | 85% | 2949 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 54,027 psi | 85% | 3038 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 88% | 55,245 psi | 87% | 3035 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 57,319 psi | 90% | 3110 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 92% | 54,737 psi | 86% | 3110 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 57,479 psi | 90% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 54,665 psi | 86% | 2953 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% | 46,934 psi | 74% | 2805 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 42,641 psi | 67% | 2808 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 80% | 49,588 psi | 78% | 2959 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 51,488 psi | 81% | 2946 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 46,847 psi | 73% | 2897 fps | 99.3% |
| ADI AR 2217 | <<locked>> | 80% | 34,679 psi | 54% | 2628 fps | 96.7% |
| ADI AR 2218 | 91.4 gr | 90% | 42,859 psi | 67% | 2904 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 31,995 psi | 50% | 2595 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 51,184 psi | 80% | 2936 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 47,485 psi | 74% | 2897 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 46,180 psi | 72% | 2818 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 40,306 psi | 63% | 2769 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 53,171 psi | 83% | 3005 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 40,959 psi | 64% | 2818 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 92% | 44,106 psi | 69% | 2877 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,585 psi | 70% | 2805 fps | 96.7% |
| Bofors RP15 | <<locked>> | 80% | 44,077 psi | 69% | 2828 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 37,434 psi | 59% | 2703 fps | 97.6% |
| Bofors RP5 | <<locked>> | 80% | 47,485 psi | 74% | 2897 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 37,898 psi | 59% | 2710 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 80% | 49,226 psi | 77% | 2894 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 48,327 psi | 76% | 2877 fps | 99.1% |
| Hodgdon Retumbo | 76.7 gr | 80% | 39,508 psi | 62% | 2828 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 45% | 1749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,676 psi | 78% | 2874 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 80% | 45,614 psi | 71% | 2881 fps | 99.2% |
| IMR 7977 Enduron | <<locked>> | 88% | 51,851 psi | 81% | 2884 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 82% | 31,691 psi | 50% | 2569 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 40,408 psi | 63% | 2677 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,747 psi | 47% | 2530 fps | 96.6% |
| Norma MRP | <<locked>> | 80% | 50,821 psi | 80% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 46,180 psi | 72% | 2897 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 80% | 41,539 psi | 65% | 2762 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,211 psi | 46% | 1791 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,899 psi | 61% | 2799 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 35,665 psi | 56% | 2680 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 52,011 psi | 82% | 2920 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 51,053 psi | 80% | 2930 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 44,730 psi | 70% | 2828 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,705 psi | 79% | 2927 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,040 psi | 83% | 2907 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 51,256 psi | 80% | 2897 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,846 psi | 70% | 2776 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 47,224 psi | 74% | 2844 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 50,894 psi | 80% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 50,299 psi | 79% | 2972 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 80% | 41,698 psi | 65% | 2779 fps | 98.2% |
| Vihtavuori N568 | <<locked>> | 80% | 36,883 psi | 58% | 2703 fps | 95.3% |
| Vihtavuori N570 | 85.5 gr | 86% | 43,830 psi | 69% | 2897 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 45,687 psi | 72% | 2890 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 47,500 psi | 74% | 2835 fps | 99.8% |
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 57 powders for 7 mm KM Katzmaier loaded with the .284 | 161gr | Peregrine VLR-4. Hodgdon Retumbo delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,952 fps to 3,153 fps. Accurate 8700 gives the best case fill at 100 %, and 57 of the 57 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 161.0 gr projectile in 0.284" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, Hodgdon US 869 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for 7 mm KM Katzmaier with the .284 | 161gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Vihtavuori 20N29, Vihtavuori 24N41 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.