The bullet you are using is either seated out to far, or is not designed for use in a .45 ACP. The bullet should not be jammed so hard into the rifling so hard as to be hard to eject. I am sure it is raising you pressures. Some bullets designed for the .45 Long Colt are not suited to use in the ACP, even though they are "45's". Usually a 200 grn. semi wadcutter bullet for the ACP will be .451 / .452 diamiter, with a short bearing surface, and a relativley long, thin nose. The bullet shoud be seated with the top of the bearing surface flush with the top of the case, using a taper crimp. Hope this helps, and sorry for the lack of spell checker...
Larry