Lee.
I have one barrel left that is a tight neck 0.269", a 6BR and it is going to be punched to a 6BRX 0.272" If you like to prep brass, go for it, it should help,. But, look at the 600 yds results. Most of the top guys are shooting no turn necks 0.272 in all the 6BR and IMP. I have shot 3 IBS...