Originally Posted by
Goldorak
The SAAMI chamber has a wrong number somewhere, in the leade, I believe. It all came down to the way Remington handled the project. At first, they supported it, and helped the individuals R&D the cartridge. However, a lot of it was to copy and paste from the 270 Win, 'cause 270 is 6.8. Some folks realized that things are different in an AR platform, hence the many "experiments." Then, it seemed that one day Remington stopped all work, took what they had to SAAMI, then froze the cartridge and washed its corporate hands. What started out as 6.8 Remington become an orphan, and morphed into 6.8 SPC, with more development work done by private individuals, without corporate backing. The chamber is different, the pressures are higher (and not blowing up the guns), the SAAMI standard is restrictive and obsolete, yet no one can change it -because no big money company is willing to touch it. Anything else folks are doing is a "wildcat" -no matter how safe or successful. And a decade too late. So, the 6.8 SPC is an "also run", an evolutionary dead end.
Do you want to talk about "pressure breaking bolts?" Let's talk 6.5 Grendel breaking bolts made for the 7.62x39 cartridge -because manufacturers are cheap or don't know there is a different bolt face for the Grendel. Do I blame the cartridge? No!
The Grendel offers the best performance at longer distances, at 600, 800, even 1,000 yards. Better than any 6.8 or 5.56. There is a 70+ pages thread in GD on TOS, for the non-believers.
For humane hunting at ethical distances, with an AR15 platform, both sixes will do great. I stand by my suggestion that bullet selection and ammo availability should be the deciding factor.
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