In my experience, the MT 77 shoots about the same as the IMI. Slightly better from some barrels, not quite as good from others. I've shot about 4k rounds of the IMI 77 load. The MT is a bit cheaper, and runs +/- 50 fps faster from a 16" barrel. Yes, faster than the IMI over my chrono. Neither load is a slouch in the velocity dept.
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