case crimp resizing bullets on way out...

[kevmc]

I cast some 429640 HPGC out of straight lead.
Sized to .431, load and pull.....from crimp groove to GC now .429.
Front band still at .431, gc still at .431...middle undersize at .429.
accuracy about 3.5" @ 50yds with 2x scope/bags.....SW 629-4 PC scope only gun.

Tried same with some BT's plain base (bhn 21) I had around, and these did not resize.
Tried with a comercial hard cast SWC (bhn about 18), and these did not resize down either.

Loaded 1st bullets (pure lead) into fired cases that I belled just enough to remove remaining crimp.
Roll crimped and pulled these and they resized to .429 from crimp groove to gc again.

So, the crimp is resizing straight lead bullets from CG to GC.
I'd like to keep these as soft as possible, but think I'd do well to harden enough that they remain full size when passing crimp.
Going to mix some 50/50 Lyman #2/Lead (bhn about 12) and try that.......

Anyone have thoughts to share........

We'll just assume up front that I'm nuts and go from there!!!!

[Bwana]

I don't know why you insist on them being pure lead that might help. When you fire a round the crimp should iron out unless you are using light loads. If that is the case, why are you crimping so much? With a light load they are not going to come forward even with five other rounds having been fired. I might suggest a light taper crimp.

[462]

1. My ex-Lee seating dies would make skinny boolits out of fat ones, as did one RCBS. And, that was done to boolits cast of wheel weights.

2. Do you seat and crimp in one step? If so, do it in two.