Here are the loads I developed for my son's .308 when he was 10 YO. Velocities are chronographed. Rifle was a Ruger MKII compact w/16.5" barrel.
130 gr Hornady SSP
26.o gr SR4759
Fed 210
v = 2,145
130 gr Hornady SSP
37.o gr IMR4895
Fed 210
v = 2,115
130 gr Hornady SSP
31.o gr IMR4198
Fed 210
v = 2,245
130 gr Speer FP
26.o gr SR4759
Fed 210
v = 2,105
130 gr Speer FP
31.0 gr IMR4198
Fed 210
v = 2,215