Optimum 6.5 Grendel bullet weights

[stanc]

The 2175 figure might be on the high side unless the powder is selected for optimal performance in the short barrel. A load using TAC to get 2420 from a 24" barrel would be likely to be somewhere between 2025 and 2125 ft/sec per the Ammoguide.com velocity estimator.

That's quite possible. 2175 fps was an estimate, based on the figures in http://www.alexanderarms.com/item/12/162...nition.htm and http://www.alexanderarms.com/grendel_ballistics.pdf

Going lighter means you give up penetration depth and barrier defeat.

IMO, you wouldn't give up anything of consequence. Lightweight TSX bullets should be quite able to defeat windshield glass and car doors just as well as heavier TSXs.

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.



For use in a 10.5" barrel carbine, going lighter seems to be all plus, with no minus worth worrying about.