Comments on: Controlling Grip on Bullet — Why Bushing Size is Only One Factor

By: Mike

Mike — Mon, 28 Aug 2017 14:16:13 +0000

Neck tension is also affected by how much you are reducing the diameter of the neck to hold a bullet. Reducing the neck diameter by 0.010 in a single pass will create about 0.002″ of taper to the neck with the mouth being smallest.

I always start with at least 0.002 larger than my final neck size and come down 0.001″ at a time after that. This way I’m removing the taper from the starting bushing.

Don’t believe it? Just try sliding your bushing back over a resized neck and you’ll see how for down it will go… then try again with 0.001 smaller.

By: DavidmDuff

DavidmDuff — Sun, 27 Aug 2017 23:16:26 +0000

Lots of variables you’ve pointed out. Thanks for starting this discussion! Need for tool to determine amount of resistance required for bullet to leave case. Look at the opportunities!

By: Tom Alves

Tom Alves — Tue, 11 Oct 2016 14:18:08 +0000

As the writer infers .001,.002, etc. are not neck tension at all but interference–the amount undersize of the neck ID compared to the OD of the bullet surface seated inside the neck. The tension is the stress caused by forcing the bullet into the neck during seating and is a complex combination of a number of factors as he identifies. Thank you for posting the article.
TA

By: mark

mark — Tue, 11 Oct 2016 08:48:31 +0000

everyone measure force for bullet seating in, but is there anybody that measure force for pulling bullet out, for experiment?

By: Mike C

Mike C — Mon, 10 Oct 2016 22:45:55 +0000

You missed length of neck sizing..
FL, Partial, .xxx in length