OK, I mowed like my butt was on fire to get time to mess with this and then the clothes dryer and its wonderful "technology" decided to get stupid on me, so I barely had time to do anything useful with this, but it's getting there.
Played a flame over the mould faces and into the cavities - some sort of wetness appeared on the surfaces other than water as a byproduct of combustion. I wiped it off and did it again. Thanks, Ian.
Slight improvement on the wrinkles.
Cleaned again when I discovered a can of acetone.
Even better, but still unacceptable.
OK, I planned on lapping this mould, so why not? I have some ugly bullets with extra "lube grooves" running helter-skelter (the wrinkles), so I lapped it, washed with brake cleaner (the good stuff) and another wipe with the acetone.
Much better, but not perfect. Looks like this is just going to be one of those moulds that resists until it doesn't.
Cast up a handful, playing with heat. This mould likes less heat on the mould and more on the alloy than my other LEE 2Cs. Fine. I'll accommodate.
The attached pic is two unsized and two sized - I think one each from the two cavities. I kept them separate to do more measuring later but I wanted to get a photo posted for those who have been kind enough not to remind me of the no pics - didn't happen rule.
And I forgot to shoot one of the pins! OK - later. The reamer line is barely visible - a couple thousandths proud, but it is concentric. I have to look at the sprue mark to tell which bullet came from which cavity unless I see them fall out of the mould. Yes, I was very, very careful, but I was very, very lucky too. Took a chance, mitigated potential disasters as much as practicable and, here it it. Wonder if it will shoot now?
Appreciate all the help and the ride along for the company. I think this one will be OK. Now to whip its brother into shape and HP one of those cavities with the GC shank left intact.