Thread: .284 Chambering & Freebore Specs

A standard reamer in 284 has a neck of around .322 which is very wide , specifically if using necked 6.5-284 brass.
You have to decide what brass you are going to use and then you can measure the diameter of the neck with the bullet of your choice seated inside. Add 0.03 or 0.04 inches to that measurement and that won’t be far off. I think both gunworks and true flite have different reamer specs in 284 that suit different options among other gunsmiths