keyholes

  1. shiner

    What gives? (keyholes)

    I loaded up some 180gr. Nosler ballistic tips with 12gr. of Trail boss. I wanted to start high and work down to subsonic. I Shot two shots at 100yrds- here is what that looked like: I then shot three over the chronograph- they were 1268, 1216, and 1218. I have a 20" barrel, but I don't know...