Have a 6mmBR barrel that I was planning to ream out to 6mm Creedmoor. My understanding was that it would be a simple operation of running the Creed reamer in as it is longer than the BR. Was talking with a gunsmith the other day and he said he would have to check the chamber as there were differences between the BR and Creed that may necessitate cutting the barrel to accommodate the new chamber.

Thoughts?