Perhaps a take-off barrel from a Swedish Rolling Block in 12.7X44R? It could be rechambered to 50/90. Tradex has some sporters and they might have a barrel as well. I have heard of people buying one of these for the action and rebarelling them, so if there aren't any barrels, you could use the barrel and sell the action. Or, build your 50/90 on the Rolling Block action.
As for a reamer, in cases like this, I just buy my own (from PTG), rechamber and sell the reamer. It'll cost you about $150 delivered.
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