shooting savage model 10 hs precision 308

loaded up 168gr HPBT hornadys 44gr of Imr 4064, i have tried 2.775 2,800 2.815 coal, all sized and trimmed to spec lake city brass

4 out of 5 bullets make a half inch group to maybe 3/4 depending on the coal i tested, but EVERY group had one flyer that made the group 1"

this happened out of 5, 5 round test shots, it even did it with my 43.5gr loads at this point im at a loss wondering what i should try?