When I chambered multiple times (until I got tired), it stretched to 7 thou. I haven't measured the jump yet, I'm using the good ole' "mag length" rule, which is also what most recipes say (2.800 for 308 loads with 168SMK).
Crimp question
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An interesting discussion. I generally do the same thing as most if you. Roll crimp into cannelure for revolvers etc. However, I don't crimp at all for .45 acp. As it is a straight wall case that headspaces on the case mouth I have routinely chamfered the inside of the case mouth of my .45 brass. This allows me to seat bullets more easily and has the additional advantage that it only has to be done once over the life of case. The chamfer doesn't go away when the round is fired. I just chuck up a chamfer tool and gently press the cases on by hand for a second or two. It's fast and easy and works well with jacketed and plated bullets. This also allows me to skip the flaring step during reloading. This method also works for .40 S&W and should work on any straight wall pistol case. Has anybody else tried this?