Optimum 6.5 Grendel bullet weights

[JASmith]

...And judging by 6.8 SPC 85gr TSX gel tests, penetration depth appears to be more than adequate, with no significant loss compared to the 110gr TSX.

The more meaningful gel test would be one with a barrier, e. g., body armor, windshield glass, door, etc. between the rifle and gel.

The TSX and TTSX are good hunting bullets -- but would like to see tests relevant to Military or Law-enforcement needs.

We can talk about optimum weights for short barrels after seeing that data or a credible ballistics analysis.

In any event, the CQB round mentioned in the OP was a 70 gr "Brown Tip". We almost certainly want to at least match, if not exceed, the sectional density of that bullet. That would result in a minimum bullet weight of 97 grains.