I highly recommend the Magtech/CBC 77gr OTM, but we all know each barrel behaves differently, so it is a good idea to try it out before committing to bulk purchases.
From my experience, in my SR15 Mod1 16" CHF LW and SR15 LPR 18" SS Krieger, the Magtech is more accurate than the IMI 77gr OTM and BH 77gr TMK by about 0.50-0.75MOA, and it is about the same accuracy as the BH 77gr OTM.
In the end, it really is win win situation for me as it is a fast and accurate 77gr OTM Ammo for about $0.55/rd