As always, it depends. Depends on which sight your O3 has, what ranges is it marked for? My suggestion if you don't mind the money is to buy a Williams match sight for it. I don't think I would make the ammo any faster than it is, 2700 fps is about as accurate as you can get with that bullet and that rifle.
Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.