07-27-2013, 05:22 AM
Welcome. Before you shoot it again, may I ask what make the barrel is? Did you install it, or did someone else? What about your gas block? What type is it and how was it installed? It often helps to bed these parts during assembly, which is an old Hi-Power Service rifle trick for squeezing out accuracy.
After that is done, I would also consider lapping your bolt to the extension. This will also squeeze out some accuracy, as long as your receiver and action are true.
I would then run a series of pressure/accuracy ladders at 400-600yds. You're probably around 2300fps with your low-end load, and around 2500fps with your 28.5gr load. With a 24" gun, I would personally want to wring out some more velocity in the 2600fps range, which means Accurate 2520 or CFE. There are safe loads that will push the 123gr target pills to 2630fps, using AA2520, from a 24" barrel. My 16" Grendel averages 2460fps with the Hornady 123gr A-MAX box ammo.
Do you have the 6.5 Grendel Reloading Handbook?
After that is done, I would also consider lapping your bolt to the extension. This will also squeeze out some accuracy, as long as your receiver and action are true.
I would then run a series of pressure/accuracy ladders at 400-600yds. You're probably around 2300fps with your low-end load, and around 2500fps with your 28.5gr load. With a 24" gun, I would personally want to wring out some more velocity in the 2600fps range, which means Accurate 2520 or CFE. There are safe loads that will push the 123gr target pills to 2630fps, using AA2520, from a 24" barrel. My 16" Grendel averages 2460fps with the Hornady 123gr A-MAX box ammo.
Do you have the 6.5 Grendel Reloading Handbook?