I bet your can’t be as bad as the one I am going to tell you about:

Army and Navy Hamerless .577 N.E converted into a 12 bore shotgun. This was done before the internet came along.Here in India some guy thought this was an obsolete bore and that 12 bore would be much more useful and practical. A lot of people exchanged their exquisite best make Double rifles for .30-06 bolt actions or for .32 Webley revolvers in the 70's 80's and 90's and still do in some places to this day.

In 2009 I was at a local gun shop. When I entered, I saw a guy begging the dealer to take his C.G Bonehill 450/400 double and give him a $300 country made shotgun in exchange for it. I picked up a Holland and Holland Royal hammerless 20 bore Paradox with a spare set of 20 bore smoothbore barrels made by Charles Boswell in original makers case with most of the tools for $2500 in 2008 but sold it because there is limit to the number of firearms one can possess.

The other side of the coin is that people sometimes go on internet and just look at best guns and quote a crazy price. Someone had been telling me of a Holland and Holland rifle for months. When I went to have a look, it was a hammer single shot .577 BPE and the guy thought it was Holland and Holland and worth at least $20,000! And I have been quoted 250,0000 rupees ($50000 USD) for a 12 bore E.J Churchill Boxlock XXV. I looked at the seller and said, “You know the dollar is not doing very well these days. Let it bounce back and you might get that price in few months time. Right now it might be worth 240,000 Rupees($48000).” He carefully put the shotgun back in the case, snapped the locks, gave me a big smile and extended his hand for a big shake He said, “Thank you,” and then walked away happy. Guess what I was thinking as he was walking away?

Grenadier,

I have seen a H&H Dominion Paradox and Westley Explora converted to smooth bore.

Dandy