Actually, a neck turning mandrel is usually about a thousandths smaller than an expander mandrel. You buy a specific mandrel for neck turning each caliber
Years ago I had a crusty 99 Savage in 284 that I considered reboring to .411. "400 Whelen short"I like that idea. I was thinking that at some point I'd like to get another Tikka rebarreled to a 338-284, 35-284, or 8-284, in a 20" and put some iron sights on it
It's fun figuring it out and learning.Simply put....just not worth the time, effort and expense for basically nothing a 300 saum or wsm can do with no pain..
Um... OkayA 30-06 by any other name is still a 30-06
Type S dies work very well. No runout issues.