I'm only 63 ....and 6'5" and about 290 lbs....so what's a relatively light field gun for me - isn't right for everybody ... ( and I like a Citori XS Skeet, with 30" barrels, as an all around clay target gun - and for upland birds)....and 8.25 - 8.5 lbs is just about right for me, with the 30" barrels.
But the comparison between the XS Skeet and the ( 525, 625, 725 series ) is an apples to oranges comparison....part of it is weight / but the XS Skeet has a parallel comb ....and none of the others do ! That affects "Fit" big time ....
Now chasing Chukars around is a little different...and my knees and back aren't going to let me do that --- / but I'd want a really light gun chasing up and down those sage brush hills - and personally, the gun in my safe, I'd go after would be a Benelli Super Sport in a 20ga, with 28" barrel and right at 6 lbs...
but that 6 lb gun is not optimal for sporting clays...it will work ( and that's what Benelli designed it for ) or their 12ga version, with 30" barrel that weights right at 7 lbs.../ and when I travel, I do take the Benelli Super Sport in 12ga - one gun, that does a lot of things well....vs more expensive and heavier Over Unders...
But some combination of weight and length...are what makes the swing dynamics and the follow thru - on a shotgun different. For an all around clays gun ( sporting, 5 stand and Skeet I like that gun ( O/U ) with 30" barrels and around 8.5 lbs....) for Trap, I go to an O/U with 32" barrels at around 10 lbs...../ back to the Benelli Super sport 30", 12ga, 7 lbs....I put about 8 oz of lead golf club tape under the foreend ...and about 8oz of lead tape inside the stock ...to get the weight up on the gun ...so its less whippy and follows thru better for me...
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pros and cons of parallel combs....parallel comb means no matter if you shoot in T shirt in summer --- or heavy coat and sweater in winter....then you face may move up and back on comb -- but your point of impact will not change. On any angled comb gun ...if you move up or back even 1/4" ...the muzzle moves up or down ...and at 25yds or 40 yds .....that changes your point of impact big time !
Some guys get an angled comb figured out ...by wearing a 12 month "outfit" ....where they essentially shoot in the same windbreaker all year long - with high tech under armor or whatever in winter../and T shirt in summer.../ but not all climates allow that..../ but if you only shoot sporting in the Fall and then hunt in the Fall, maybe its no big deal --- get the gun fit and you're ok. But when its over 100 degrees and humid in summer ....vs 42 and rain in winter.....or snow and 22 ..../ I need a coat on ! ( not that I don't have enough body fat to live thru it ...
)...but parallel comb guns, for me, just work better - and with the adjustable comb will "Fit" 99.9% of the shooters out there....