I went to a gun show Saturday and found what I thought, a odd JM Marlin Ballard #6. Everything looked right on it, including a #4 barrel but, when I asked the caliber he said that it was 32 XL and had done a chamber cast to find out the caliber. Looking down the barrel, it looked that small, too. It didn't have a round firing pin but, I couldn't find a screw on the side of the block for the reversible pin.

Has anyone heard of a 32 XL #6?

Frank

Agree.  Never knew of a RF Ballard #6. Has it been rebarrelled with RF replacement breechblock? I guess it could have been a special order. SS#'s would tell. If all matching, it would have to be very rare.   Bob

I think if you were to check this gun's serial numbers you'd find they didn't match each other. I can't imagine any reason a shooter who could afford what a #6 cost back then, who would order one in a caliber like 32XL. Basically a poor caliber for any type of shooting a #6 woiuld be used for.
I'm guessing the barrel wont match the frame, or maybe even other parts that wont match too.

Frank. Origionals are not found in .22 cal. The #3 is in .22 caliber. The closest you could have gotten was a 3F but it had a pistol grip.  Don

I believe the .32 XL was a CF only. The .32 Long, and .32 Short were either RF or CF. Ballard barrels are pretty easy to swap from other guns since they have no markings beyond the serial number, and caliber (on later barrels).  Usually when a barrel is swapped to a Ballard from a donor it either has the rollstamp polished off, or it's turned under the forearm and the length chopped to remove the front sight dovetail. 
If it is done recently the barrel will not match usually, but if it was done long ago it might be tough to tell.
Haven't seen the gun mentioned, but if it's a true #6 the receivers were PG, but the stocks were not. If it was a PG frame and PG stock, then it's not a #6.
Should have this lever and stock style:
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