I had loaded a few dummy rounds yesterday and measured at the case mouth I was getting .379. I was chatting with another member and he told me that it should be around ..381-.382 with his factory loaded jacketed ammo. I backed off my seat/crimp die settings to just take out the case mouth belling and my rounds now measured .380-.381. I then pulled the bullets and they still measured the same as before they loaded at .3565. I will be ordering a 38S&W expander plug next week.