This is pretty anathema military outfits for obvious reliability in the field / logistics reasons. This means that military users either have to restrict the weapons to specialist users only and/or institute a round-count recording system with automatic bolt replacement at x,000 rounds. However, it leaves the base of the lugs so thin, that the bolt has a relatively low life in round-count terms before fatigue cracking sets in. Its case-head / rim dia is as large as the M4 / M16 bolt can handle and still have some metal left to provide locking lugs. The Grendel is a developed 6.5mm PPC which in turn is based on the 7.62X39mm /. This is one reason why the Grendel lost out to the 6.8mm SPC as a 'second string' cartridge for specialist / special forces use. I'm sure you're correct on the disincentives to moving away from the 5.56 dimensioned round and the associated NATO weapons platforms built around it such as the US M4 / M16.
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