I got a mold for the Lee 155 grain 7.62 bullet and am having difficulty fitting my Vulcan 30 cal .0135" checks on, They are too tight. The rebated area is .284-5". I have gotten some on with a plastic mallet taping along the edge but have ruined about 30% of them. Once run through my sizer, the ones that got seated are fine.
My question is: Would thinner checks give me a better chance at fitting them?