I just started my 12 year daughter with a .243 she has no trouble at all with 100 grain. I did start her with the 58 grain varmint loads for her first few shots. To me the biggest thing is quality ear protection. Even in the blind something that will muffle that blast. Last time at the range she was freaked out by the noise of the 458 Buffalo gun the guy next to us was shooting. Even with muffs that thing rocked the entire range.