Bullet Bump Die
thingiverse
This is a simple bump die thought up by Mr. Matthews. once you place the bullet in the die you hammer on the punch and it will expand the bullet about .001"-.002" in diameter. Don't bother printing this, there is no way printed material is strong enough to withstand constant hammer punching against solid lead. I just wanted to get the design out there and maybe someone can machine them. I'm including an excerpt from a book detailing how to make it and how to use it. I'm also throwing in my fusion 360 files.
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