Regardless of whatever else you do, use extreme caution about seating to a depth greater than COL as listed in your load data. The further you seat a bullet, the more you reduce the size of the combustion chamber and the more you increase pressures. I've seen guns blown up by seating too deeply.
1. Make sure you have bullets designed for the 45 ACP and not for a 45 Colt. This is a typical SWC for the Colt:
This is a typical SWC for the ACP:
Notice the difference in the angle and width of the nose portion. In addition, a Colt bullet usually has a crimping groove where a ACP bullet does not.
2. Confirm the diameter of the bullets. As someone else mentioned, 45 cal. lead pistol bullets can be sized to different diameters.
3. Take a round that won't drop into your new barrel completely and see if it will drop in the Glock barrel. If it drops into the Glock barrel, I'd start thinking there were some out-of-spec problems with the new barrel.
4. To echo others, get a Lee Factory Crimp Die. Nothing better.