Anyone ever noticed if Starline brass is thicker than say Winchester brass in .223 ? I've have some Winchester brass and loaded it with 25.0 grains of IMR 3031 with a 50 grain Nosler BT andits super accurate in my CZ 527. The powder charge comes nearly to the top of the case, but I still have room to get the bullet started before seating. Not so with the Starline brass. The 25.0 charge comes right to the top of the case and it can't get the bullet started in the mouth of the case. I've measured the charge about 6 times and it always come up to the top.