I'm looking for a light .243 load for my son. He's 10 years old and is pretty lightly built. He's shot his gun with the .243 barrel on it once, 100 grain Remington core-lokt factory round. For a .243 it kicks pretty good. He didn't care for it much. The gun is a Rossi single shot youth gun. Pretty light. Barrel is short, 22 inches. I bought some 60g Sierra bullets and some IMR 4350 powder. I chose the powder because I can also use it in my .280, .308, and .338 Win Mag. Does anyone have a good, light load for this bullet in .243? I have a Speer manual but they don't list a 60g bullet. Any help would be appreciated.