Brian ,
I have one of the Round action Chapuis 30/30's with the 28 gauge BBL's . It's regulated with the 160 grain Hornady Leveroution . I own quite a few doubles and this is by far my favorite !!!! It's scoped with leopold 1x4 compact scope. As to the power of the 30/30 , I have used it with good effect on pigs and deer . I really can't imagine a better combination for most of the USA (30/30 with 28 gauge) .
It's accurate and very well made , I love mine and shoot it almost every week don't think you can go wrong with this one.
Robert