Hello, I need to know. I will cast some bullets with Gas Check for calibers 30 & 8mm so I will need to expand the neck before load the cast bullet with Gas Check same as lead bullet with no Gas Check ?
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I load .310 gas check cast bullets into .308 cases with no assistance beyond a good chamfer. A Lee "M" die helps, but I have never bothered to get one.
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Ok where you get your .310 Gas Checks ? I'm looking for this size for my 303 Lee cast bullet .312 !
Regular Hornaday .30 cal gaschecks work fine. They seat properly on my Lyman 150 gr rn bullets and crimp in the .310 die. I use the Hornaday .32 cal gas checks for the 8mm