bigcountry

Basically, they say. But they say alot if you know what I mean. That if you are reloading a say a 270Win. You want at least one caliber of bullet into the brass for sufficent neck tension or you might get blow by or whatever. By one caliber, that means at least .277" of bullet inside the brass. For a 300RUM, .308" of bullet seated in the brass. You really don't want that bullet so fragile you might knock the bullet cockeyed chambering.