Went out and chrono'd some IMI 77 grainers out of my 18" Ballostic Advantage Premium series SPR barrel and got an average of 2756 FPS with a standard dev of 33.5 and extreme spread of 86.  The temperature outside is at 32 degrees and I'm 200 ft above sea level.  I've also chrono'd a few other loads like ZQI M855 and Hornady Steel match 75gr this afternoon as well.  Hope you find the info useful!

Yes it is some hot stuff! Not always the best for accuracy but it does let you really reach out with only a 5.56.

your right it is pretty hot! so far it shoots a hair over MOA out of my gun but its still being broken in so im hoping it'll improve slightly.  I was most surprised today with the Hornady steel match only going 2440 FPS.

Funny. IMI 77gr RC turned out to be the most accurate load I have tried in my 16" 1:7. PRVI 69gr OTM was the best in my 14.7" 1:9. Just goes to show you have to try out lots of ammo to know what's good for you.