Thread: How much length does a case gain in the sizing die?
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Old 09-10-2021, 01:19 PM
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mikld mikld is offline
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Originally Posted by Tim357 View Post
I've not had pistol brass grow that i remember. Generally, bottleneck rifle cases grow as they are dragged over the expander ball. Straight wall pistol brass doesnt get dragged over an expander ball, it is pushed into an expander. If anything, pistol brass tends to shorten over time, or at least stretching is held to a minimun. YMMV
Any time a brass tune is swaged, it will lengthen. Sizing (aka swaging) does not remove metal, it just dislaces (moves) it. On a straight walled case the easiest place for the metal to move to is toward the mouth, thus making he case grow in length... "Metal Working 101"

Or at least when I size any of my 9 different caliber handgun cases...
Last edited by mikld; 09-10-2021 at 01:23 PM.
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