I use a laser for 7.62x39. I can't remember the brand but, in the list of calibers, x39 and .303 used the same one.

It gets me on paper vertically just fine. I have to adjust for elevation. I try to get them shootin' about 2 inches high at 25 yards on an indoor range. When Fall arrives, well actually maybe next week, I'll drag a couple faux snipers out to the 'big shootin place' and see what happens at 50 and then 100 yards. It's supposed to be down around 100 degrees by mid next week.