Anyone with HW97K experience. Had mine for a few months and as expected is capable of shooting good groups. However a strange phenomena has emerged resulting in a impact shift. Stable for about 3 tight (5 shot) groups before changing pont of impact (normally in a clocwise pattern with groups shifting up to about 6 mm for another few groups before shifing again). Investigated scope/mounts, operator inconsistencies (hold/trigger control), stock/action mounting screw tightening torque variationd and pellet alternatives, to no avail. On removing the stock I have now found the main "U" shaped mounting bracket fixing (via 2 screws) the fore-end of the stock to the rifle itself, to be completely loose (as in rattle fit, capable of moving at least 1mm from side to side). There are two adjacent, externally visible, welds at the barrel receiver interface that I presume should fix this bracket in place.
Is there anybody who can confirm original fixing condition of this bracket and shed some light on the problem. Thanks.