Originally Posted by AZShooter
He used that new reamer with the next barrel.....sorry should have mentioned that. Only alternative would be to cut off old chamber and cut a new one.
All of which means that if the same loads are used in a smaller chamber in a barrel with the exact same bore and groove dimensions, peak pressure's higher than in the previous barrel.
Seems to me the new barrel's chamber would have to be exactly the same diameter as the case (maybe smaller) to prevent primer pockets from enlarging.