The Phoenix Arms .25acp pistol is about as high capacity as you'll find I think.
https://www.phoenix-arms.com/pages/hp25a
For super capacity and super fun the PMR30 is a blast. Suitable ammo costs about $11 to $15 a box and it can go fast! Not for a child though as it's a pretty large grip and quite loud.
For simple range fun I've come to like the Ruger SR22 because it shoots any and all ammo, has nice features, very easy to load mags and is simple to operate and clean.
The Ruger 10/22 Charger is as close to a high cap .22lr as they make. I've no experience with it. Cheaper than a PMR though.
https://www.phoenix-arms.com/pages/hp25a
For super capacity and super fun the PMR30 is a blast. Suitable ammo costs about $11 to $15 a box and it can go fast! Not for a child though as it's a pretty large grip and quite loud.
For simple range fun I've come to like the Ruger SR22 because it shoots any and all ammo, has nice features, very easy to load mags and is simple to operate and clean.
The Ruger 10/22 Charger is as close to a high cap .22lr as they make. I've no experience with it. Cheaper than a PMR though.