when you first got it did you clean it before shooting it? or did you go shoot it then clean it when you got home? also every walther ive shot didnt matter what caliber it was they are tempermental guns when it comes to ammo, they seem to dislike hollow points and/or plain lead bullets. you might try winchester super-x .22's or any quality ammo that is a round nose copper coated bullet, stay away from the cheapo bulk stuff, the only bulk 22 that might be ok would be the federal bulk ammo at wal mart. good luck