Just to make sure we haven't confused the daylights out of you....a couple of points...
Your original post said you liked the Maxis....but if you meant the Browning Maxus, it is a gas operated semi-auto ---- not an inertia gun....
16 ga....has mostly gone away because there are no competitions shot with a 16ga ( only 12ga, 20ga, 28ga and .410 ).....and while I still have a 3 shot, bolt action, 16ga in my safe...it was a present about 55 yrs ago and I killed at least a ton of grouse with it...../ ...there are not many 16 ga's made because the demand is so low .... / ballistically, the 16ga traditionally fired a 1oz shell.../ today it's really easy to buy 1 oz shells in 12ga or 20ga, so the 16ga got squeezed out of the mix....still around for nostalgia, but not many guns made in 16ga anymore...( Browning BPS hunter model pump gun is one of the few I know of still made in a 16ga....and a couple in the Citori line as well....and the new line of A5's, but it's a recoil operated inertia type system...).
Getting beat up by a shotgun ...is not a matter of Manning up.....i'm 6' 5" and a "comfortable" 290 ....but a poorly fitting shotgun will beat the stuffing out of me if it doesn't fit right ...too much angle on comb will push the meat in my face up against my cheek bone and beat the heck out of me....vs recoiling under that cheekbone like it should, poor shooting fundamentals - bad elbow positions will let the stock crab down my bicep and bruise it....all of which is fixable.........by understanding "fit" and stock dimensions you need.
I'm a big Browning Citori fan.... but 80% of the Citori line of guns don't fit me ( lightning, the 725 field or sporting etc...) because they beat me up - because they have angled combs and too much drop at Heel..../ where the XT Trap, 725 Skeet with adjustable comb, the old XS Skeet model...fit me great....and I can shoot 200 shells a day, with no pain...../ so you have to figure out what works for you...
Go to your local club...talk to the competition shooters about Fit.....Trap and Skeet shooters will both tell you how they figured it out / how to check a gun .....before you buy, talk to them about Skeet vs Trap guns....weight, barrel length, etc..../ and look at some videos, or dvd's on gun mount, swing fundamentals.....and have fun with the process....