Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 177gr | Peregrine Glider GRM bullet and 49 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 Alliant Reloder-33.
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% | 56,115 psi | 88% | 2828 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 52,301 psi | 82% | 2884 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 82% | 55,666 psi | 87% | 2946 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 82% | 57,450 psi | 90% | 2920 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,362 psi | 88% | 2940 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 55,883 psi | 88% | 2930 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 56,579 psi | 89% | 3068 fps | 99.7% |
| ADI AR 2225 | <<locked>> | 94% | 55,709 psi | 87% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 56,971 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 56,826 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,027 psi | 86% | 2831 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,057 psi | 88% | 2913 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 54,360 psi | 85% | 2969 fps | 99.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 54,259 psi | 85% | 2963 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,391 psi | 88% | 2904 fps | 99.5% |
| Bofors RP15 | <<locked>> | 86% | 56,217 psi | 88% | 2923 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 55,811 psi | 87% | 2943 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 56,826 psi | 89% | 2933 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,290 psi | 90% | 2946 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 54,810 psi | 86% | 2871 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 57,653 psi | 90% | 2913 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 55,941 psi | 88% | 3012 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,087 psi | 60% | 1864 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,013 psi | 86% | 2848 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 55,027 psi | 86% | 2927 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,290 psi | 90% | 2864 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 54,404 psi | 85% | 2936 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 54,723 psi | 86% | 2805 fps | 100% |
| Norma 217 | <<locked>> | 96% | 55,941 psi | 88% | 2956 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,000 psi | 89% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,333 psi | 88% | 2946 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 54,694 psi | 86% | 2874 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,117 psi | 61% | 1906 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 56,434 psi | 88% | 2992 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 55,506 psi | 87% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 57,493 psi | 90% | 2887 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,782 psi | 89% | 2897 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 54,012 psi | 85% | 2890 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,434 psi | 88% | 2897 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 56,898 psi | 89% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,174 psi | 90% | 2858 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 56,420 psi | 88% | 2897 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 82% | 56,623 psi | 89% | 2858 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,304 psi | 88% | 2956 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 57,696 psi | 90% | 2953 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 55,927 psi | 88% | 2972 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 92% | 57,624 psi | 90% | 3045 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,362 psi | 88% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 56,782 psi | 89% | 2864 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% | 49,037 psi | 77% | 2723 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 41,727 psi | 65% | 2690 fps | 96% |
| Accurate MAGPRO | <<locked>> | 80% | 51,793 psi | 81% | 2884 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 80% | 53,592 psi | 84% | 2861 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,878 psi | 77% | 2818 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 80% | 36,419 psi | 57% | 2569 fps | 98.2% |
| ADI AR 2218 | 85 gr | 86% | 38,754 psi | 61% | 2703 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 33,634 psi | 53% | 2543 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,258 psi | 83% | 2851 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,501 psi | 78% | 2818 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,254 psi | 76% | 2733 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,424 psi | 66% | 2694 fps | 100% |
| Alliant Reloder-33 | 84.5 gr | 84% | 40,016 psi | 63% | 2694 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 88% | 40,103 psi | 63% | 2687 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,238 psi | 72% | 2730 fps | 98% |
| Bofors RP15 | <<locked>> | 80% | 46,079 psi | 72% | 2756 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 39,436 psi | 62% | 2644 fps | 98.9% |
| Bofors RP5 | <<locked>> | 80% | 49,501 psi | 78% | 2818 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 39,711 psi | 62% | 2644 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 80% | 51,140 psi | 80% | 2812 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,212 psi | 79% | 2795 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 80% | 41,611 psi | 65% | 2762 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,543 psi | 45% | 1667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,488 psi | 81% | 2792 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 80% | 47,659 psi | 75% | 2805 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 50,227 psi | 79% | 2746 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 31,154 psi | 49% | 2457 fps | 96% |
| Lovex S071 | <<locked>> | 80% | 42,235 psi | 66% | 2605 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,633 psi | 50% | 2487 fps | 98.3% |
| Norma MRP | <<locked>> | 80% | 52,997 psi | 83% | 2884 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,573 psi | 76% | 2825 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 43,555 psi | 68% | 2694 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,370 psi | 46% | 1706 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,307 psi | 65% | 2740 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 37,739 psi | 59% | 2631 fps | 97.2% |
| Rottweil R 904 | <<locked>> | 80% | 53,940 psi | 85% | 2831 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 52,997 psi | 83% | 2841 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 40,770 psi | 64% | 2644 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,649 psi | 83% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,200 psi | 83% | 2808 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,789 psi | 73% | 2697 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 42,946 psi | 67% | 2654 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 53,069 psi | 83% | 2808 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,388 psi | 82% | 2894 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 43,671 psi | 68% | 2713 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 38,769 psi | 61% | 2648 fps | 97% |
| Vihtavuori N570 | 79.4 gr | 82% | 39,914 psi | 63% | 2707 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,356 psi | 76% | 2808 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,400 psi | 77% | 2753 fps | 100% |
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 56 powders for 7 mm KM Katzmaier loaded with the .284 | 177gr | Peregrine Glider GRM. ADI AR 2218 delivers the highest muzzle velocity at 3,068 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,068 fps. Accurate 8700 gives the best case fill at 100 %, and 56 of the 56 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 177.0 gr projectile in 0.284" calls for a 1:7.5 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, Alliant Reloder-33 rank at the top here: for 7 mm KM Katzmaier with the .284 | 177gr | Peregrine Glider GRM they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon 50BMG 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.