Those dark purple bullets were coated,then Lee-sized to .359 , then heat treated. I then seated Hornady checks with a Lyman lubrisizer using the seater,checks snapped on, crimped and measured .362.
No neck tension problems loading,I also get a very clean barrel,shooting these from a Rossi carbine with a rough,large bore.
Green and gold bullets were fully sized with the Lyman,checks are measuring .3595 , bullets being .359 (that is a modified 358 die.)
Depending on your glasses,you can actually see the check size difference in the pic. Purple ones look like "scrapers", which they are.
Is there a general rule or reason to size gas checks closer to bullet size?