I believe that if you have reg creep the first shot is usually "hot" not low. But stand to be corrected.
I would put a tin through it and see if it settles down a bit, before major surgery etc.
FTP900 +Sightron S111 10-50 x 55
AA Pro Target in FWB FP70 stock + MTC Mamba lite
Daystate Airwolf + Bushnell Elite 6500
" life is about the memories we hold and not the things that we own"