Depends on how far your shooting and how much velocity you need to be efficient at what you're trying to do. A lot of guys use the 220gr and heavier bullets for subsonic loads, but if you need to reach out with a 308 the 175-185 class is pretty stellar with a 20" barrel. I haven't shot anything heavier then 175-178gr stuff through my 26" barrel, so I'm only speaking of what I've read from others here. What are you trying to accomplish?
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