Folks. . . I have a T3 varmint in .223 that I've started shooting for the first time (It's sat in the back of the safe for a couple of years) and it's "two-grouping". I removed the Vortex viper and replaced it with a trusted NF 12 x 42 BR scope but the problem is still there. It will put several shots under a half inch and then for an unknown reason start to throw shots about a minute and a half low and right. I thought I'd throw this out there for any ideas before I start ripping my hair out and indiscriminately trying things. Any suggestions would be much appreciated. I already checked and rechecked scope bases, ring screws, action screws etc. etc.