Unless you are desperate for money, hate the gun, or have a lucrative offer, or some other extraordinary reason, never sell your guns or ammo.
If you sell it on a whim, you'll take a loss and regret it. You'll really take a hit on the reloads, maybe get 10 cents per round because nobody wants someone else's reloads.
If you are intent, a trade will net more value. Trade it for something you want. You'll be net = guns, maybe come out ahead.
The consensus from hundreds of years of combined experience here will overwhelming say keep it - especially a 1911 in .45. It's an iconic and excellent pistol. As others said, they take up little space, and are easy to maintain. Also great to use to train yourself and others on a different platform.
Clearly you know the merits of the 1911 and .45 as you have owned, shot, and reloaded for decades....
Also consider this. Let's say you need a backup gun for a spouse, one breaks, or you lose or have one of yours stolen or it's used in a home defense shooting and is confiscated as evidence - you have an instant replacement.
Guns are fascinating tools - affordable life savers. When you need one, you need one. No time to go to the store, fill out paperwork, etc.
Hold onto it, wipe it with oil, put it away. I nearly guarantee that in a year or five, you'll pull it out and be happy you kept it. The $500-700 or so you could get for it and the ammo would likely have quickly been spent on things you'll have long forgotten when that day comes.
But again, having said all that, if you are set on giving up the .45 if I were you I'd trade the entire setup rather than sell. You can almost certainly get a favorable trade deal into a gun and ammo of your choice, especially from reloaders in your area.
I only have one pistol cartridge. If it wasn't 45 ACP it would be 10mm.
