Neck sizing question

[Shawnba67]

I am trying to figure out the correct neck bushing size for a modified set of reload dies im making just upsizing 22-250 to 6mm250 a loaded round that in new brass measures. 267 at the neck. I. Thinking of reaming the neck to . 264 is that gonna be enough for proper hunting grade bolt rifle neck tension? (ido realize il be stuck with one brand of brass)

 

[Blue68f100]

You normally only need the neck to be only 0.001"-0.002" less than the bullet. 0.003" may be too tight. Try and see, you can always go larger later on.

 

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Contact Lee Reloading, They have collet dies that you may need. That's where I get mine.