Since I know nothing about chamber specifications I thought I'd ask you gents for some help. I measured a new 300 win mag case right in front of the belt (.509), at the end of the neck (.335 O.D.), and for oal (2.612).(This is a loaded Win. Supreme round)Next I measured several once fired cases in the same way, in front of the belt,(.512)at the neck,(.341 +or- .001)and oal(between 2.615 and 2.623). I'm about to jump into reloading and am trying to decide weather to full lenght size or just neck size. I've heard that in a tight chamber it is better to just neck size so finally to my question can you tell from these measurments which route I might have more luck with?
Ignorance can be treated with education, sadly there is no cure for stupidity.