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Shoulder bump

I bought some once fired brass, 6 dasher, and the shoulder bump measurement is 6-7 thousandths shorter than mine. Will there be any mechanical adverse effects when shooting them?
 
It depends on the chamber they were fired in.

If the rifle had a fat chamber, a regular die may not resize the base enough to fit in your rifle.

But in 6 Dasher, the other rifle was probably pretty tight, so I doubt you need to concern yourself with that.

As long as you can chamber the sized cases, you are good to go.

After you fire them in your rifle, then you'll want to set the headspace closer.
 

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