I had one modified to 50 cal by using a mint M2HB barrel. That was a PITA, especially since the barrels are chrome lined. Much cheaper and easier to simply use a 50 cal barrel blank, which is what I did on my present rifle.
I changed mine for the exact reason that cletrac mentions: I can get 50 BMG for around $5 a round, whereas what little Boys 55 ammo that is still out there will command from $25 to $50 a round these days, and there is not enough of it around to satisfy dragging the heavy bugger to the range.
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