having a 6 br or 222 rem built

[kailua custom]

You mentioned the "donor" action as coming from a 204. This means the bolt face is set for the [if you will] .223 Rem family of cases. If you want to make a 6 BR you`ll have to have your gunsmith open up the bolt to the .473 diameter and change the extractor. Check this out as this gets spendy sometimes. At this point check the little 6 PPC. This is the all-around winner in the BR tournements. You might consider keeping the [204] action around for another project and look for another donor with the correct bolt face. Any good 243, 308, 22-250 action will do you well. Good luck with the project.

Aloha, Mark