Alright, I'm trying to load up .357 magnums, using Winchester brass, Rainier lead-safe 158 grain bullets, and lee dies. The first round I loaded I thought my seating die was also crimping, so I adjusted the die, and loaded another one, and adjusted and loaded another one, and adjusted and loaded another. Now I have three rounds that all appear crimped on a bullet with no crimp groove, despite following the instructions with the dies to avoid crimping. As I continued playing with the die adjustments (loaded three more) I noticed that I can actually see where the base of the bullet is through the case. The edge of the case mouth was very slightly bulged, and clearly indented into the bullet(no crimp groove)and there was a .002" difference between the outside diameter of the case where the seated bullet was, and the case below the bottom edge of the bullet. I took some measurements and first noticed the cases outside diameter (after full length sizing) was .374" and both my manuals and the info with the dies lists it as .379". Further inspection revealed the inside diameter of the case to be .353" and the bullets all measured in at .3565 (measured 10 of them). I don't think this seems alright (though I'm new to loading, so maybe it is) but it appears that the inside case dimensions are not big enough, and the the bullet is forcing the case wider. My three guesses are I'm doing something wrong, my full length sizer isn't working properly, or the brass is not the right size. Any ideas as to what the problem is?
