My nine year old (4'3" and 70 pounds) shoots a Howa Mini in 6.5 Grendel. I took the LOP down to 10 inches and the barrel is cut to 18 inches and it has a Banish 30 suppressor on it. The recoil is almost nothing, and the lack of muzzle blast has helped her avoid bad flinching habits. We're shooting 110 grain Lehigh Controlled Chaos bullets at 2500 fps. She took a bit white tail with it last fall, and a big red stag this fall. The deer made it about 100 yards, but the stag only made it about 30. That little cartidge punches way above its weight.