Lots of good shooting rifles have been done with several different methods. It don't mean one way is right and one is wrong as long as the method you choose gives wonderful results on target. Most Short Range Benchrest Gunsmiths and shooters chamber barrels indicated in on both ends and drill/bore before chambering. Some of the best shooting rifles I've ever had was chambered in a long headstock Leblonde Regal with a bushing holding the outboard end inside the spindle and only indicating the End you are working on. Some of these barrels are on Short Range BR guns and do very well with the rest of the pack.