Greg,
I sent you an email, but will answer your question. First the OP posted about barrel breakin and not cryo. You may have brought up cryo and I responded with my opinion from a lot of experience with a real cryo company. I posted that I have done it with "undrilled" blanks, drilled and rifled blanks, and chambered blanks. I have done them with cryo only on the blanks, only on drilled and rifled, and complete chambered barrels.
I won't post on this anymore.
Last edited by butchlambert1; 06/02/15.
