2.820 is about the absolute max internal mag length in a 308 type M7 mag.
The creed case is not a bad fit for the M7. Ive screwd a rem 700 take off 6.5CM tube onto a M7 and im running my handloaded 143gr eldxs at a coal of 2.813" which fit and feed from the mag. The proji is seated out mostly in the neck not taking up alot of the powder capacity. Can get enough Re26 in there without compressing it to push it along pretty well. Whereas using the same bullet in say a 260 case and mag feeding it would loose alot of powder capacity
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