Published COL usually doesn't work in a particular pistol. The ogive of 45 acp bullets gives a lot of clearance relative to the bore of the pistol. If the shank of your 45 Long Colt's bullets is above the case mouth, they will not chamber.
Correct seating is to have the entire shank of the bullet below the casemouth, so that the bullet clears the lands when chambered. 45 acp bullets are designed specifically for the chamber dimensions of the Colt's 1911. Autoloading pistols have little flexibility for out of spec ammo.
1. Get 45 acp bullets and abandon your "experiment" with improper bullets.
2. Make a dummy round (no primer, no powder) and check that it chambers and the pistol will go to battery when it is chambered.
3. Apply no additional crimping -- proper sizing ensures correct bullet tension.
4. Always bear in mind that the 45 acp headspaces on the casemouth, and that the 'freebore' is zero for all intents and purposes.
5. When your dummy round cycles and chambers in the pistol, make a small run of live ammo and head to the range.
Stoppages in the 45 acp are ammo related most of the time. The most common reason for such stoppages are rounds where the bullet is not seated far enough into the case.