The only 7.62 platforms I'm interested in carry a fairly hefty price tag, primarily the Larue OBR or LMTs offering. I'm not sold on the LWRC SABR and the SR-25 is way beyond what I'm willing to spend. For my uses I can't justify a AR-10 style rifle over a bolt action with a magazine. My current .308 is a FN PBR with 18" barrel and brake and it gets he job done.
That being said I've set up my ARs to be almost identical in 5.56 and 6.8 SPC. I can practice and compete with my 5.56 and hunt or whatever with my 6.8 which feels almost identical. The operation is the same with a negligable difference in recoil, weight and ammo capacity ( using Barrett mags). I don't think you necessarily gain any range, just better effect at any range you'd use your 5.56 for. My 6.8 has a Larue stealth upper reciever, WOA barrel, 13.2" Larue handguard and PWS muzzle break and mirrors my 5.56 Larue stealth upper. I use a nightforce 2.5-10 with FC-2 reticle and get sub MOA results ( awesome barrel !!). I wouldn't use it in close quarters and, thank God, shouldn't ever have to. I would love to have a 1-4 with FC-2 reticle but will likely go with a Trijicon TR-24 with green arrow reticle.
At this point, ammo prices for 6.8 and .308 are about the same with much better availability of .308 and of course the .308 will do everything the 6.8 will do and do it better.
For anything beyond 300 yards I'd prefer a bolt action rifle over AR platform anyhoo. Within 300 yards 5.56 is fine for 2 legged critters, 6.8 is better. I've taken caribou at just under 200 yards with a 6.8 with 115 Gr Barrett ammo ( using a sierra hollow point ). I'm interesting in loading up lighter 90 Gr Barnes TSK to see how those do. Thanks for listening to my rambling.
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