You would have to be stepping on a standard 7-08 pretty hard to even get 2750 from a 162 out of a 20" barrel. That is the upside to AI cartridges or larger chamberings in small packages. You get standard cartridge performance out of a barrel that is 4 inches shorter (i.e. you pick up an extra 80-125 fps when all things are equal).
Mines an AI with a little extra throat
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