Thank you! I have a 24” proof on my 6.5 Saum and wish I had gone 20 on it. Didn’t have the suppressor when I built it and clearly didn’t think about the oalI had a 6.5 SAUM (very similar to PRC) with a 20” barrel and I wouldn’t go any shorter. My top barrel picks are Bartlein, Krieger or Muellerworks.
Southern Precision Rifles (Bugholes.com) is a great source for barrels and they can do the work too.