Just ran across a P. Powell (palm on) single shot rifle on lock says P. Powell and Sons dated 1870-1877. I know he was a gunsmith and ran a mail order shop in Cinn. Ohio, selling mostly knockoff shotguns. I've seen several on completed auctions and most aren't going for much money, usually less $400 dollars. However, I've never seen a Powell and Sons breach loading centefire rifle, even checked the completed auctions on James Julia and Sons and Rock Island auctions for last 10 years, never had one for sale. Anybody know anything about this gun, any value. Looks to be in good condition, no rust, tight action, good bore.

Grant has a mention of a Powell & Son rifle in Still More Single Shot Rifles with a picture of one that looks like yours.  The one he describes takes a 1-5/8" long shell in .44 caliber.  A correspondent told him he had found one barreled with a Remington .38-55 barrel, which may or may not have been aftermarket.  He included a woodcut from some Powell & Son stationery showing the rifle with a special shell fitted with a percussion cap nipple.

It is in Chapter IV, "A Miscellaneous Assortment," and in it Grant says he will forego putting in pictures of rifles whose scarcity doesn't warrant such an inclusion. But in the next sentence he says an exception to that statement is the Powell rifle pictured.  So I would imagine that they are pretty rare.