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Ok gents, so I've emailed with American Tactical a couple of times and finally have confirmation their Omni Hybrid Maxx is rated to stand the pressure of a 6.8SPC. It's actually documented in their 2017 Product Catalog; of which they sent me a free copy. Now, I know most of you guys still aren't fans of the polymer receivers, and you're certainly entitled to your opinions, but I'm gonna give this a try. We'll see how it turns out...
Now, back to the original issue that prompted my original post: which caliber should I build? I'm torn between the 6.8SPC and the 6.5G (after quickly dismissing the 300BO). Grand, I make the assumption that if the polymer receivers can withstand the 6.8SPC that it can withstand the 6.5G; would that be a safe assumption in your estimation?
SAAMI lists the max chamber pressure at 54,000 PSI. Some of the older Grendel data lists it at 52,000 PSI. Fairly close on both.
