Another interesting aspect about the Gren is the low SAAMI pressure spec of only 52K psi.
With a long sleek bullet, like the 129gr LRAB, it would mimic the effects of the longer throat of the 5.56/.223Wylde vs the .223. I commonly load the Wylde to 60K psi. With 748, that gets me to 2600fps in a 22" barrel, and 100% fill.
At my altitude, that keeps your velocity at 2k all the way out to 500 yards, and still above 1450fps at 1000 yards.
129gr bullet at 2600 out of a standard AR frame.....hmmmm, that could be interesting.
That’s my plan. Just got a 20” PSA upper and for this year I’m using the 123 ELD Hornady ammo, but once I get some time I wanna crunch up some 129’s cause if exactly what you mentioned.
I’ll take my chances with the Grendel cause I know it really isn’t a chance.
