Alloy makes a difference-
Tested 4 alloys & 2 size dies. .429" vs .431" The .429" die always produced a .430" finished diameter bullet. When a higher % of pure was added to the mix, the finished diameter got smaller. Less spring back after sizing.
Measure the sized bullet, it may not be the diameter on the H&I die. Different alloys spring back, after sizing, at different rates. I knew this, but got lazy and didn't check finished diameter.
The lighter weights of the bullets is normal, when the % of antimony is higher.
**Alloy composition not known of the pure/scrap/scrap + Linotype metals.**