Im new to reloading but my best groups so far from my howa 6.5 were from r-19 45.0 grains pushing 130 grain serria hpbt gamekings about 2600 fps.
have tried ar2208 with 140 grain a max and interbonds cant get as tighter groups as i have with r19. I got put off the a max rounds cause i got told i shouldnt be hunting with them, apparently they are designed for punching paper.
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