An observation... spring-back!

[bosterr]

I cast some boolits today for my .475 Linebaugh. They sized and measured at .4762. I measured some that I cast 2 months ago, but sized some time later, .4768. I then sized some today that I cast in the same batch 2 months ago, .4768. These were from WDWW. Sure, the 2 month old boolit sized harder, but I gained .0006 (mic measured). They drop from the mold .4785. I know .0006 isn't very much, and isn't much of a gain for an undersized mold, but it's something. Next I'll try the same thing with 60/40 WW/lead just for grins and giggles, but I'm not expecting as much spring-back.

[Yodogsandman]

You might be experiencing the effects of boolit growth reported by members using antimonial alloys during age hardening. What alloy was used?

[Shiloh]

I've experienced the sam thing. Seems to vary from .0003-.0005.

Shiloj

[bosterr]

I used water dropped wheel weights. The boolits I sized the day I cast them, I could slightly turn the checks on the shanks. The ones I sized on the day after and 2 days after, the checks couldn't be turned. This is the first time I really bothered to measure day 1, day 2, day 3, etc. My size die is exactly .4762, So in my case, to get .4768 I have to wait at least 2 days to size. Much harder to push through my Star, so I have to run a lubed boolit through it more often. I know, I know, I'm being too anal.