I did a drop test with a 17" supressed Tikka 6.5cm (SWFA 3-9 sportsmatch) that I put in a Stocky's VG. Everything torqued, degreased, loctite. I did 3 drops from knee height on a pad with a supressor installed. It didn't pass. I took the stock off and sanded out the barrel channel and added the washers between the bottom "metal" and stock. I melted them in the plastic and re-torqued to 65in lbs. My son and I performed a drop test but removed supressors for the drop and then re installed for the shots. We also removed and installed supressors for 10 shot groups before the drops. No shift of zero. We drop tested 3 tikkas. 2 in Stockys, one 223 Rokslide special in a factory stock. I don't know what caused the initial shift, could've been supressor, no room for a dead cat, ....?