ok right off the bat....i shot sierra 174 311's. i slugged the muzzle and my k31 is 310 x 302. this was a major disappointment, but it was a cheap gun from big 5. this was the same load i use in my 91/30 with hornady 174 hpbt. just a few to put the scope on paper. i used weaver rings which gave a nice rezero. spent some time centering the mount mostly up and down with a minor left right adjustment. put the scope on, fired a round....adjusted the mount a bit left to right...and then again. put a target at 100yds, fired a two rounds getting a better zero...then put three rounds in the x ring( an sr-21 target.....less than an inch.
best i can tell the mount did not move and these were some stout loads...flat primers....
looks like time to put some cast slugs down the bore.......