snowman, Zero clearly states that their 44 bullets are sized at .431 diameter. I bought one of those Lee press mount bullet sizing dies in .429 to process the Zero bullets down and they caliper at around .4295-.430 after I run them through my Lee sizer die, which I do when I receive a bullet order of the .44 Zero bullets. If I had an older model 29 that tend to have larger throat diameter I wouldn't even resize them, but both my 44 guns are 90's vintage with the smaller throats on the cylinders.

BTW oink, I got rid of my Lee 44 FCD and went with the Redding profile crimp die instead. I didn't like the way that the Lee would drag going through the sizing ring when loading MBC hard cast coated bullets with most brass (except Remington brass). The Redding die is fantastic, BTW.