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I'm trying the Grendel to get a lighter weight rifle overall but the shorter length is a dream to carry.
I reckon if you can manage a 20" barrel you're better to use some of the length and weight to...

So, your shorter rounds show less pressure (as shown by ejector marks).
That's what you'd expect if you were starting to touch the lands with the 2.260" seating.

The key dimension is not COAL...