rifle is a 308 30" mcgowen 10 twist bull on a wsm action, load is 44.0 varget w/ 168 smk. bushnell 4200 6-24x50.


symptom: i can cloverleaf the first 10rds (less than 3/4 moa) but by rd 15 i am walking low by 1 inch and by rd 20 i am low left and opened up to 2 moa. this is very consistant w/ this rifle and probably not shooter error as it is only w/ this rifle. i am thinking it is a heat issue and is just one of those things where it is what it is, but i know that the veteran shooters have shed light on several of my other problems here and would like your input. total time from round#1 to #20 is less than 10 minutes....