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Seems like I read somewhere that the old model Blackhawks in .45 Colt usually had oversized chambers and oversized throats, rather than the other way around.
Do you shoot a lot of lead?
I'm betting that you have a carbon/lead buildup in and/or behind the throat area, preventing chambering of a different shaped bullet than you usually use.
Get a piece of lead removal cloth, cut a piece from it, and put in in a cleaning jag attached to your cleaning rod. Being careful to not rub the lead removal cloth on blued exterior surfaces (it will easily wipe the bluing from your gun), use it to clean the chambers on your cylinder. While you're at it, maybe clean the barrel with it too.
It's best to remove the cylinder from the gun to do this.
Once the cylinder is very clean, try loading it. If the problem persists, I suggest taking the gun to a gunsmith for examination, or stick with the loads you've used in it 'till now.
Daryl
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