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if you want to use a moderate 6.8mm load with the shortest bullet available
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The 113gr projectile provides the 6.8 it's max ballistic performance when having to balance
residual powder capacity against seating depth req'd of a AR platform (the OP's original question).
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...would use the 130 grain hornady interlock sst bullet, ive ran the numbers...
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6.5mm grendel will never receive due to it requiring a single stack magazine and having feeding issues...
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Never had a failure to feed or extract in more than a thousand rounds.
Use of a 130gr bullet requires it being seated well beyond the 2.26" max length of the AR magazine
or you run into the same case capacity problem mentioned earlier. (In fact Hornaday 8th lists
their 130gr interlock/6.8Rem OAL as 2.355")
What does "single stack magazine" refer to? The Grendel uses a standard AR double-stack magazine design.
(In fact I once used my AR-15/5.56 magazines on a dare ...which functioned fine.)