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Sounds like there is not enough metal in the mould to keep the heat in.
I make my mould bodies from 32mm dia 1045 steel and the top and bottom plates, are 5mm thick. They hold the heat well, even in the 50cal mould.
These are the moulds I had here for a while?

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Yup, same ones, had the chamfer removed, sprue plate & handle added, maybe I need to do it in a warm shed, and keep mold well heated. Projjies have wrinkles, indicative of 'cold mold syndrome'
will have another go this weekend after I reduce the depth/height of the .286 mold to keep projjie weight at 145-150gr.

@ Gungadoug The GC maker - see thread on castboolits,Link added
Easy one,all specs given.3 step, whackamollee type

http://castboolits.gunloads.com/showthread.php?150997-hand-tool-made-check-maker

progressing to a 'press mounted type'

http://castboolits.gunloads.com/showthread.php?236273-Another-GC-maker

For the skilled machinist-or any one who is not all thumbed,left handed ,like me!

http://castboolits.gunloads.com/showthread.php?101816-DIY-check-maker-book

http://castboolits.gunloads.com/showthread.php?200965-Easy-to-build-gas-checkmaker