TargetTalk

Just bought one of these used in 22 cal. Shoots well but it starts to jam at 100 rounds. The casings are tough to get out and tough to get seated. Obviously fouling is causing it. Is this normal for this pistol?

Is a tighter chamber the cause? I am using various ammo so I don't think it is any one brand causing it. My shooting experience with other rimfire pistols has been they are not nearly this sensitive.

Thanks in advance to this Noob question.