According to the data I've seen, you need a muzzle velocity of about 2500fps or higher to keep it above 2300 at 75yds.
That's if you are using the 2300fps fragmentation threshold as your guide.
If you want to use a 2400fps frag threshold, you'll need closer to 2600fps or maybe a bit more
You need close to the 14.5" barrel velocity, but a little bit less will do.
You are going to lose about 180-200fps at 75yds from the muzzle with that bullet in those velocity ranges.
I got that data in the ARFcom archives describing fragmentation ranges/velocities of various bullets in 5.56.link