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Brian Pfleuger · February 22, 2013, 11:22 PM

If you do that with a fully sized case you will not get a good measurement. The neck tension is much too strong and will push the bullet well into the rifling.

You can size a small part of the neck or size the whole thing and then cut the neck vertically with a hack saw so the tension is lower.

If you do it right, and a few times to verify, you can just chamber and extract the case/bullet and get a decent measurement. It takes some practice.

The Hornady comparator tool is a lot easier and more consistent.

February 22, 2013, 11:22 PM	#9
Brian Pfleuger Moderator Emeritus Join Date: June 25, 2008 Location: Austin, CO Posts: 19,578	.270 Advise If you do that with a fully sized case you will not get a good measurement. The neck tension is much too strong and will push the bullet well into the rifling. You can size a small part of the neck or size the whole thing and then cut the neck vertically with a hack saw so the tension is lower. If you do it right, and a few times to verify, you can just chamber and extract the case/bullet and get a decent measurement. It takes some practice. The Hornady comparator tool is a lot easier and more consistent.