ok if I did load development with my 6.5 creedmoor and Nosler brass that was brand new never shot and found a great load how would you think that same load would be with the fire formed brass after being sized? Or am I over thinking it?
Spot on!This is where a chrono can be handy. If you where in a good node with the virgin brass you should be able to just change powder charge a few tenths or so to match the velocity you had in the virgin brass.