onondaga
posted this
08 December 2013
http://www.castbulletassoc.org/view_user.php?id=281>Tom Acheson
Lee Collet Neck Sizing Die for a lever action is a gamble. If your fire formed, then Collet Neck Sized brass, and your loaded ammo from it functions well through your lever action, then you are fine. However, fire formed brass body size does not always function well in a lever gun with neck sizing only. If you try it and it works, go with it.
My first recommendation with a lever gun is FL resizing with a custom size expander bell that gets your case necks .001” smaller than the correct throat fitting sized cast bullets for your rifle. An expander bell/DE-cap pin for a .303 Brit with the top shortened to the length of the original overall length of your previous one usually does it for most 30 cal lever guns. You can swap expander bell/ De-cap pins in Lee FL dies or Lee will custom turn one to your specification for a fee.
I also recommend a chamber casting to get an accurate throat measurement and then do what you have to do to get your un-lubed bullets to match throat dimension. With a fit of the bullet to the throat, the ball seat/ leade will size your bullets into the rifling perfectly as you shoot for the best accuracy of your rifle.
Gary