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View Full Version : Chrono results for 70 gn GMX in .224 in an AR



guy_with_boolits
01-28-2021, 11:23 PM
This is a bit of a mess but might help someone

These were bought from midway as pulled / rejects

I only loaded the ones that seemed pretty good. Didnt measure them though.

They appear to be 70gn GMX which does NOT have the polymer tip (there seems to be some misleading/contradictory Hornady info on this)

.224 diameter

Random range pickup brass trimmed to 1.750"

No crimp

2.250" COAL

22.5gn H335

1:7 AR w/ 16" barrel

Went through 6 rounds and only got one chrono result: 2645 fps

This is within 40 fps of the predicted speed from a very similar Barnes TSX BT bullet (Barnes data) so I think things are looking normal

My chrony setup is modified with an LED and has an unknown history but I am pretty confident in it

Anyways that is all