Welcome from Va. I would say you are anticipating the recoil and pushing the gun befor it goes bang. Try some dry fire practice and when shooting remember, trigger finger control and just pull threw with even pressure and just let it go bang.
Fullsize SIG Sauers and classic USGI 1911s have always been among my favourite guns, I never stop learning, and after about 37 years of guns-ownership I still enjoy shooting my own reloadings at least twice a week.
This is one of the best gun forums among the several I belong to, hope you'll enjoy your time here.
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