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It's certainly pushing a heavier bullet then either a 30-06 or .308 so I would imagine that the powder capacity is greater then either of those cartridges. It's OAL might be less but it's diameter is certainly greater. Your typical .308 NATO round has about 2200foot pounds of energy at 100 yards compared to a .50 Beowulf that has about 2100ftlbs. That isn't to say that the .50 competes ballistic with the.308 past say 150 yards. The 6.5 Grendel however is in the same league the .308 and even surpasses it in some aspects. Regardless the only commonality between the .223 and .50Beowulf is that they are fired from the same platform.

Personally I would prefer to have a AR-15 in 6.5 Grendel then a M-14 or a FNFAL in .308 and depending on what I was likely looking as using the rifle for I might even go with the much maligned .223 over the .308.

It's certainly pushing a heavier bullet then either a 30-06 or .308 so I would imagine that the powder capacity is greater then either of those cartridges.

it is not.

those heavy bullets cannot maintain the velocity for more than short ranges....

and my preferences are for M1 Garands, 1903
springfields and Trapdoor Springfields....nice big cases...
but if I was going into battle I would defer to at least a .308 size case for weight and volume carrying ability.

Now if I really wanted to carry a .50....it would be a semi-auto Barrett in .50BMG....now that's a rifle....