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g.willikers · June 16, 2012, 03:32 PM

Also be aware that the mouth of the case is used to "headspace" the round.
The thickness of the front of the case, the part that surrounds the bullet, is meant to contact the front of the chamber in the barrel, in order to properly locate the cartridge in the chamber.
Too much crimp can mess that up, by allowing the cartridge to move too far forward.
Proper headspace is very important for many reasons.
If in doubt how much crimp is correct, just compare your loaded rounds with a factory one.

June 16, 2012, 03:32 PM	#12
g.willikers Senior Member Join Date: September 28, 2008 Posts: 10,442	Also be aware that the mouth of the case is used to "headspace" the round. The thickness of the front of the case, the part that surrounds the bullet, is meant to contact the front of the chamber in the barrel, in order to properly locate the cartridge in the chamber. Too much crimp can mess that up, by allowing the cartridge to move too far forward. Proper headspace is very important for many reasons. If in doubt how much crimp is correct, just compare your loaded rounds with a factory one. __________________ Walt Kelly, alias Pogo, sez: “Don't take life so serious, son, it ain't nohow permanent.”