I have started loading for an old 380 pistol I have had for years, and I am having trouble fitting ammo into the barrel. Using purchased range brass, cleaned and inspected of various makes. Remington 1-1/2 pistol primers. 2.5 grains of W-231 powder, and 115 grain purchased lead projectiles from the ACME company, coated with some sort of red stuff, the RN-NLG type. I miked some of them and they come up at 0.356". When I load them with Hornady dies, most of the cases measure 0.372" to 0.374" and seem to fit in the barrel and shoot just fine. But some of them measure up to 0.380 at the mouth and jam in the gun before they seat far enough in the barrel to chamber properly and lock up to fire. Those that measure this large have a noticeable swelling of the case as far down as the bullet is seated. Three or four of them were of one make, headstamped G.F.L and 380 AUTO. Is there a solution to this problem or what should I do?