They ones I coated were new cast. The bnh will change as the new boolits age. Prove it to youself. Check some fresh ones. Then check them 3-4 days later. They will be harder.....if you are using a good mix. Hard lead alloys do that. I always cast up several hundred and let them become stable before shooting. According to studies done and listed here, the hardness will continue to change for up to several months! WOW! I think there is some data on the
www.LASC.US links.
Also, since cooking them got the temps back up in the boolits, the bhn is probably on the move again!
And besides, any liquid-based paint/coating will have residual softness until all the volatiles are totally gone, which can take several days, even if baked. PC is ready as soon as they cool from what I have seen, but I have never shot them that soon. I just like to give them time to settle down. Have never had ANY leading problems with my "wait a bit" method!
More power to you if you can shoot regularly! I just don't have the time. And I cannot just go out in my back yard and pop off a few test rounds as many of the guys on here can do. Living in town has it's benefits................ and drawbacks.
Good luck. Let us know how your fresh shoots do.
bangerjim