I shoot a lot of short barreled (14.5 and 16 inch) 6.5 Creedmoor in a semi-auto platform, and I have been extremely happy with performance.
In the competition space I shoot Quantified Performance (GP and Practical divisions) and NRL Hunter (Team/Heavy Open) with a suppressed 16" 6.5. I did shoot one PRS match with it in like 2018, but it's not really the gun for that (especially as there were not enough gas gunners for a separate division at that match).
My go-to ammo is Berger loaded 140gr Hybrids, or a 135gr A-Tip load. Lots of folks like the lighter weight 6.5 projectiles, but I have not found them to be an advantage for my use. I almost exclusively use KAC 20-round steel magazines.
I hunt vermin and hogs with the same 16" 6.5, and I easily reach out to 700 yards with it, with acceptable terminal performance with appropriately placed hits. Since adding that rifle to my safe, I have reduced my .308 gas guns to just one 16" upper, and I only kept that one in case I need a .308 for some specific requirement.
A 14.5" 6.5 with moderate speed 140gr Bergers will show about the same drops as a 20" .308 shooting 175gr SMKs at M118LR/AB39 velocity, with less wind effect. The 16" cleanly out-performs it.