Hi webguy,
I am 6'7" and right now go a little over 300, and yes, I need to get rid of some fat cover. Have recently begun a plan to get down to 250 - 260, when I get skinnier than that muscle starts to go too.
I am a big ol overgrown midwest farm boy that has baled lots of small square hay bales and stacked them in the barn
So I am familiar about having a heck of a time finding a gun that fits.
I also shoot sporting clays, trap and some skeet, with sporting clays being my favorite by far.
Anyway as to you gun question. skeet and sporting clays guns generally speaking are relatively flat shooting, and 1 gun can easily shoot both sports with ease.
Do you want to use the same gun for hunting, or just clay games? And what percent of use for each?
I have 3 browning 525's, two are 12 gauge and on in 20 gauge, all are sporting clays guns. I also had an adjustable butt plate put on them to drop the pad some and toe it out for a better fit, this modification also lengthened the length of pull about 1/2 inch from how it came from the factory, to a length of 15 1/4 inches which works for me.
I use them for sporting clays, skeet when I shoot it, which is only a few times a year, and doubles trap.
In the 12's one has 30" barrels, the other 32" and the 20 has 32". The 12's are designated "grade I" and are a no bells and whistles blue collar sporting gun, that if you can find one new will run around $1800, at least mine did.
They did not make the sub gauge sporting guns in grade I or the 20 would be one too. There are a few 525's still new in the box, but they have been replaced by the 625.
Big dudes can easily handle the longer barrels, even for skeet, and it helps smooth out the swing.
Anyway the citori brownings are good solid performers, and you may be able to find a decent used one in your price range.
Most importantly if possible handle and possibly shoot different brands and models to see what fits you best.
I do know that the 425 and 525 do not fit the same, I like the 525 better, but others I shoot with do not.
I do not use any of these for hunting, for that I have a 1200 winchester and a wingmaster both of which have had the stocks stretched a bit for me.