A 1 inch miss at 100 yards is a 6 inch miss at 600 yards, all else being equal (leaving atmospheric conditions out of this equation) ...if you're shooting prairie dogs, then its a clean miss...If you're shooting deer, if you dialed the wind right... and aimed center of the kill zone, you'd still kill it clean.
Barrel time has the same effect on any round fired in a barrel that is not fixed solid and cannot move...longer barrel time means more time for recoil to move the barrel, and it usually moves up but it depends on the gun and how its stocked...stock cast can also send it off to the side....think about it, it makes sense...trap shooters seem to do better with longer barrels, longer barrels shoot higher by virtue of the increased barrel time, trap shooters also like a gun that shoots high...I'm thinking barrel time is part of the reason they like the longer barrels, even if they don't know it matters.
I couldn't help but chime in...you guys stumbled right into the one thing I do consider myself to be fairly well educated on...long range rifle shooting...I've been doing it since I was 10 (33 years ago), and I can fairly state that I'm good at it.
My deer rifle is a Nosler M48 Custom in 280 Ackley Improved...I shoot mostly 160 grain Nosler Accubond bullets fired at 3,020 fps, those do fine on deer out to 800 yards, thats where they drop below 1,800 fps, they don't expand well below that...If I'm shooting at game any further than 800 I use 168 grain Berger VLD's fired at 2,940 fps.
I'm just getting started in this shotgun game...but when it comes to rifles...I've got some nice toys

and many years of experience playing with them.
I could post a bunch of pictures and stuff of me showing off...but I'm more proud of passing on what I know to my young son, who took his first deer this past year at well over 200 yards.
Getting ready to squeeze...
Done deal...1 shot and down (7mm-08 by the way)
Then went back the next day and took his first buck (a spike) at 30 feet.....from the ground...
A video of him hitting the 200 yard steel at the range...8 years old....this was last year, he is now hitting at 500 and making his own wind observations and adjustments....start em young and teach em right!
