Firstly fire without silencer, if all ok it can be a couple of things from past experience
1 bore is not central to barrel, larger bore required on silencer
2 threading has ruined the crown ( bad grouping without silencer as well, but scope is good), re crown
3 silencer bore is too small, no sign of clipping, but after silencer was enlarged, it grouped well
These are 3 things I have had lately with newly threaded rifles, I am not a expert by any means, but these are some of the problems I have seen.
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