500 cases will fit in a gallon zip-lock bag with ease. I ran 1 bag of brass through the bolt of the gun last night. I looked at the headstamps, all were 556 or unmarked 223. I got 124 more cases that will fit the shell holder.
I posted on another forum about using a 380 auto bulge buster to resize the cases since both use the #4 shell holder. One member said no, they are made for pistol cases, not rifle. When I get a Lee order together I'll add one to it.