You need to drive that projectile 4.25" back or 1.25" forward, you don't have good access from the forcing cone. Backwards is the way. I've done this many times, as a range officer, I carry along with the normal, extra ear protection and shooting glasses, a 1/4" copper rod and a 8oz hammer, to drive squibs out, successful 100% so far, when extra force is needed, we put the rod in the muzzle and bang the rod against the wooden table. The copper rod will not hurt the barrel, as you are shooting a .45 bullet oversizing is not a big issue as you can only get bigger from there one size, .50, a .50 would not go into your cylinder. Don't be afraid to smack the rod hard and often, it will come out, I know you've been around but for lawyers sake, please remove the cylinder or have it open. If you cannot find a rod of proper diameter, you can use an empty cartridge case that will easily fit through the bore as a slave on the end of the rod to fill up the space and have the most surface area, rim against the bullet of course. Using too small a rod, you can poke a hole, through the bullet. The flat surface of a cartridge rim will help.. Welcome to gunsmithying.