One thing that you may want to try is "painting" one of your rounds with a sharpie pen. Make it a dummy with no primer/powder. Let the slide push the bullet into the chamber with a liitle bit of force, but not enough to get it stuck if you can. Take it out, and see where the black is rubbed off. You should be able to tell where your pinchpoint is. It may be the case also. If your bullet has 4 or so marks on the ogive spaced equally then it is obviously hitting the rifling. Back your bullet up untill it sits .002 off the rifling, and that is your max COL. Any longer will engage the rifling and possibly push the bullet back into the case.
As far as pushing them back after crimping, try on and see how it works. Worst case, you ruin 1 round and have to yank and resize the rest.
In the end, you may need a different bullet altogether.