The 444 uses standard 44 caliber bullets. If the Sierras are loose in the cases, that is a problem. Are you new to reloading? Have you properly resized the cases? What brand of dies do you have? Are they new? The 444 takes a 3 die set, like any straight walled case. Have you checked the size of the expander plug in die #2?
I have the same question. Did you put the bullet in the brass before you sized it? Because if the brass was fired in a gun already, and not sized, the bullet would be loose. If you run the brass through a sizing die, you will not be able to put the bullet in the brass with out the aid of a seating die. The bullet diameter you stated is for the .44 cal bullet and is used in the 444 Marlin.
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