I loaded 95% of those .45 Colt and .45acp back in January and February.
The problem is getting the primers though to reload. At least those probably won't be missing entirely for years and years. If RP really is only doing 9mm and 5.56 reloading for the foreseeable future...
Some other guys might be doing something similar. Going to make it mighty hard to get something that isn't one of those for months at least. Unless you reload. Then again, most of the guys that sell primers, also sell loaded ammo. So they might be using all the primers they are making for loaded ammunition.
So maybe they won't be easy to find for a long time also.