There seems to be alot of confusion on this whole 45/44-40/410 issue. When I was a kid, which was many years ago, quite a few old timers would say you could shoot 44-40s in a .410. My father actually had an old single shot shotgun which was stamped right on the barrel 44-40/.410. However if you noticed the 44-40 was first and here is the clincher.....the guns were chambered and proofed for 44-40. They just happened to be able to shoot .410s, which were much lower pressure. The same would be true for modern guns chambered for .45Colt. I had a Cobray single shot deringer which shot either .45Colt or .410s. However, a .410 shotgun won't chamber the .45s and is not meant to handle the extra pressure of either .45s or 44-40. In other words, guns chambered for .45 or .44-40 will sometimes handle .410s but guns chambered for .410 should never have .45s or .44-40 fired in them.
Hope this is helpful.
Tony212 :grin: