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Old February 5, 2019, 07:29 AM   #2
Bartholomew Roberts
Senior Member
 
Join Date: June 12, 2000
Location: Texas and Oklahoma area
Posts: 8,128
Eh, if you are going to shoot subsonic only from a 5” barrel, might as well go 9mm or .45. I’ve never had any issues feeding 220gr (SMK or Rem FB) or 208gr (AMAX) in PMAGs, although thankfully, there are a lot more options than 220gr or 208gr for .300 subs now

I can’t imagine what accuracy looks like with a 1/7 twist on a 5” barrel for the longer rounds.
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