Thread: 284 win slow speeds

Originally Posted by Jim356

Yes gunworks did the reaming. From what I can tell when measuring the brass it does seem to be just a fraction wider at the very base of the neck. What did you find to be the ideal neck clearance with your 284 @GWH?

In the early days of 284 popularity in F Class the Yanks said the 284 likes "good" clearance. I could never work out how a cartridge could have the intelligence to know it needed good clearance. Obviously with good clearance there is some safety but you are also working your brass a lot more.

In all likelihood with springback your throat is probably .315. Did you get a copy of the reamer drawing? I always request that of the Smith. That gives me information for neck turning etc.

If you are using bushing dies the neck at the neck shoulder junction will always be larger due to bushing dies generally not sizing that far down plus the chamfer present on the bush.