2nd the local gunsmith comment.
Go down a row of vintage SxS guns for sale look at the muzzles, you can spot the poor open jobs right away. Problem for a gunsmith is the guns were bored then regulated, bent to shoot to point of impact. 100 years later were are you going to index the reamer to open chokes ? Before the spot it was bent, after, one barrel more than the other or perhaps it was not bent at all. Result is out of round at the muzzles a good percentage of the time. Other risk is change in point of impact after. It can be done well by a well equipped shop, not cheap work though.
Modern Gun, Remington 870 for example, barrel is formed on a mandrel straight and all the same and easy to ream out. I have a couple of nice SxS guns that were opened before I bought them, they shoot fine, some of them very hard to tell. But if you can tell it's been altered the gun is worth a lot less than unaltered. However it's your gun open if you like.
William
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