Titegroup works with 4.0 grains however I noticed sooty brass and light recoil, so I bumped up to 4.4 grains (which is FMJ max) and found it much more to my liking, and with sufficiently hard and properly sized bullets I have no leading problems.
Warning ,this info is above max recommendations, you could put your eye out. Always start ten percent under max and work up. Etc.