13-16 grains of 2400 under a 150 gr bullet in a .308 will give you very little if any recoil and a velocity in the 1200-1400 fps range. You'll have to crank your scope or sights up quite a bit- I use similar reduced loads in military rifles and need to crank the rear sight up to approximately 600 yard setting to zero ay 100 yards.

I wouldn't go any lower than published loads for a rifle powder like 4895, you can get anomolies like secondary detonations to occur which will destroy your rifle and hurt/kill the shooter.