Re: Chamber neck dimention for 6.5-06
I have 3 tight necked custom chambers: 6.5 rem mag, 280AI & 338 RUM
I don't have to neck up or down since I use brass that is made for these calibers, so my experience may be less applicable
But I don't understand why you are "reaming" rather than "outside neck turning". Outside neck turning is much easier to control and even though I have the capability to ream, I very seldom do it.
All of the chambers are tight enough so that I have to do a complete outside turn in order for the case to chamber
6.5 - .293"
280AI - .313"
338RUM - .366"
In all of them I turn for a chamber clearance of .003" which is tight but enough for hunting purposes
.293"-.003"=.290"-.264"=.016"/2=.013" per side
The Remington brass averages .015" or so
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