I've done a bunch of 12ga SxS's - the problem you'll have is cost. A GOOD adjustable reamer will cost about $105.77 from MSC [phone # 1-800-645-7270]. And don't think those cheap imports will work- they don't! MSC sells both - cheap and good. Next is size. Reamer size "A" goes from .468 to .531. A 28ga goes from .550 for cyl. bore to about .528 for full choke. If your gun measures anything smaller than .531 you'll have to buy a second reamer, "B" that goes from .531 to .593. Also, if it's a new gun with chrome bores, forget it. You'll just dull the reamer. They carry two different types of adj. reamers , one is only good for about .010 adjustment, the other about .060. The ones with more adjustment have #02231017 for "A", and #02231025 for "B". If you're going to do it, I'm not sure of the quality of Brownells reamers, they're about $45 I believe. Good luck - Paul

Last edited by bladesmith; 09/06/07 12:23 PM.