Re: Custom 6.5x55
If you need another 100fps or more, then, yes run and 'improved' reamer through it. I haven't tried and 'Improved' yet but there are others here how have and can espouse the benefits beyond velocity.
I love experimenting but what has stopped me from 'improving' is also the practical side of me that says, '"if in ain't broke, don't mess with it"