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.

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