I have firearms in both long and short barrels (17"-28") and they each have a purpose. I can tell you that my shorter barrel specialty pistols do not have an issue stabilizing bullets as I have shot them to 1000 yards numerous times. Velocity is not great so you have to run more MOA in your bases to get there though. Accuracy wise, they tend to embarrass a lot of rifle shooters. I haven't noticed any real wolrd stabily problems and most likely won't be an issue until you find the yardage where you drop to sub-sonic velocity. A friend of mine has killed prairie dogs at 1800 yards and big game over 1000 yards with 15-18" barreled specialty pistols.
My 28" .243 AI is about perfect for what it does, scream. It is just a heavy bench gun that is easy to load for and shoots tiny groups waaaaay out there. With roughly half the drop at 925 yards as my buddies .260.
I would never feel under gunned going afield with a 20-22" barrel and actually prefer them for most occasions.
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