Load Specifications
Load data in caliber 7 mm KM Katzmaier with .284 | 153gr | Peregrine Glider GRM bullet and 52 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ADI AR 2218 and Vihtavuori N570.
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% | 55,680 psi | 87% | 3005 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 47,282 psi | 74% | 2956 fps | 96.2% |
| Accurate MAGPRO | <<locked>> | 84% | 54,897 psi | 86% | 3120 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 84% | 56,942 psi | 89% | 3100 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,782 psi | 87% | 3117 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 94% | 54,824 psi | 86% | 3097 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 55,405 psi | 87% | 3219 fps | 98.8% |
| ADI AR 2225 | <<locked>> | 96% | 54,157 psi | 85% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,623 psi | 89% | 3091 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,188 psi | 88% | 3114 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 54,346 psi | 85% | 3015 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 54,911 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 54,810 psi | 86% | 3097 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,421 psi | 90% | 3196 fps | 98.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 3182 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,159 psi | 88% | 3074 fps | 98.7% |
| Bofors RP15 | <<locked>> | 88% | 55,608 psi | 87% | 3100 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,708 psi | 86% | 3107 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,188 psi | 88% | 3114 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,420 psi | 88% | 3117 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 54,592 psi | 86% | 3048 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,377 psi | 90% | 3091 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,101 psi | 89% | 2999 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 54,404 psi | 85% | 3182 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 59% | 1998 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 54,781 psi | 86% | 3025 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 86% | 54,143 psi | 85% | 3100 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 92% | 57,072 psi | 89% | 3028 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 56,942 psi | 89% | 3156 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 57,522 psi | 90% | 3035 fps | 100% |
| Norma 217 | <<locked>> | 98% | 54,346 psi | 85% | 3120 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,391 psi | 88% | 3127 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,405 psi | 87% | 3120 fps | 100% |
| Ramshot Magnum | <<locked>> | 88% | 53,838 psi | 84% | 3045 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,667 psi | 61% | 2041 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,100 psi | 86% | 3163 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 54,215 psi | 85% | 3127 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 84% | 57,261 psi | 90% | 3068 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 84% | 56,405 psi | 88% | 3081 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,226 psi | 77% | 2969 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,028 psi | 88% | 3081 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,085 psi | 86% | 2999 fps | 99.6% |
| Somchem S385 | <<locked>> | 84% | 56,478 psi | 89% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,768 psi | 89% | 3035 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 55,970 psi | 88% | 3058 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 84% | 55,883 psi | 88% | 3041 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,767 psi | 87% | 3133 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 56,753 psi | 89% | 3120 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 92% | 54,824 psi | 86% | 3133 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 94% | 56,217 psi | 88% | 3199 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 54,882 psi | 86% | 3104 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,623 psi | 89% | 3048 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% | 45,324 psi | 71% | 2835 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 43,816 psi | 69% | 2887 fps | 95% |
| Accurate MAGPRO | <<locked>> | 80% | 47,587 psi | 75% | 2982 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 80% | 49,647 psi | 78% | 2976 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 44,976 psi | 70% | 2920 fps | 98.7% |
| ADI AR 2217 | <<locked>> | 80% | 33,228 psi | 52% | 2641 fps | 95.4% |
| ADI AR 2218 | 93.4 gr | 92% | 44,106 psi | 69% | 2982 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 30,574 psi | 48% | 2605 fps | 97.4% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,603 psi | 78% | 2969 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,658 psi | 72% | 2923 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,338 psi | 69% | 2851 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,464 psi | 60% | 2789 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,865 psi | 80% | 3035 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 42,119 psi | 66% | 2900 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,266 psi | 71% | 2956 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,062 psi | 67% | 2828 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 42,351 psi | 66% | 2851 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 35,897 psi | 56% | 2720 fps | 96.6% |
| Bofors RP5 | <<locked>> | 80% | 45,658 psi | 72% | 2923 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 36,289 psi | 57% | 2723 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 80% | 47,471 psi | 74% | 2920 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,630 psi | 73% | 2904 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,563 psi | 84% | 2946 fps | 100% |
| Hodgdon Retumbo | 76.7 gr | 80% | 37,652 psi | 59% | 2844 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1788 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,095 psi | 75% | 2904 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 80% | 43,729 psi | 69% | 2904 fps | 98.5% |
| IMR 7977 Enduron | <<locked>> | 90% | 53,577 psi | 84% | 2969 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 86% | 34,766 psi | 54% | 2707 fps | 95.9% |
| Lovex S071 | <<locked>> | 80% | 38,812 psi | 61% | 2703 fps | 99.7% |
| Norma 217 | <<locked>> | 80% | 28,181 psi | 44% | 2536 fps | 95% |
| Norma MRP | <<locked>> | 80% | 48,762 psi | 76% | 2999 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,106 psi | 69% | 2917 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 80% | 39,639 psi | 62% | 2782 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,080 psi | 46% | 1831 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,101 psi | 58% | 2815 fps | 99.4% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 36,724 psi | 58% | 2766 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 50,328 psi | 79% | 2953 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 80% | 49,197 psi | 77% | 2959 fps | 99.8% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 45,934 psi | 72% | 2907 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,863 psi | 77% | 2956 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 51,329 psi | 80% | 2936 fps | 99.2% |
| Somchem S385 | <<locked>> | 80% | 49,458 psi | 78% | 2930 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,366 psi | 68% | 2805 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 48,689 psi | 76% | 2927 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 48,994 psi | 77% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,341 psi | 76% | 2999 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 39,958 psi | 63% | 2799 fps | 97.2% |
| Vihtavuori N568 | <<locked>> | 82% | 37,898 psi | 59% | 2785 fps | 95% |
| Vihtavuori N570 | 87.5 gr | 88% | 44,976 psi | 70% | 2982 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,323 psi | 68% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,759 psi | 72% | 2861 fps | 99.5% |
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 | 153gr | Peregrine Glider GRM. ADI AR 2218 delivers the highest muzzle velocity at 3,219 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,219 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 153.0 gr projectile in 0.284" calls for a 1:8.0 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. Hodgdon Retumbo, ADI AR 2218, Vihtavuori N570 rank at the top here: for 7 mm KM Katzmaier with the .284 | 153gr | Peregrine Glider GRM 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.