your not a lone i have the Pietta, as well brass frame 58 rem and it too has a timing problem do not use the pellets in the gun 24 rounds and it was done for. use 3f, fff, in 20 gran max not 25 or 30, you will see the dif tighter groups, less kick.
how do, new here, try dropping your powder charge to 90, then in cress it at 5 g ie 95 then 100 then 105. see if it still does it, to see what it does could be barrel thump, do to loose wedge pin(s). just a thought
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