The better the gun/the better the ammo=fewer flyers
Every rimfire I've ever owned/shot had ammo types it loves, and ones it won't shoot well no matter what. There are extremes in both cases. One-ragged-hole groups from the right gun/ammo....a shotgun pattern with a semi shooting bulk crap. Sometimes you get lucky and find a gun that shoots cheap ammo really well, but I've had allot of 22s come and go over the years..and can only think of 1 time this has been the case. CZ452~Winchester 333 (white box)
There is hope though~make sure the gun (incl. bore/chamber) is nice and clean, take a variety of ammo out with you (including something better than bulk) and see what's really happening. Probably worth noting that most, if not all bulk ammo is high velocity..and high velocity ammo is always the least likely to shoot the most accurately. Not saying impossible, just not likely. If it's a semi you're shooting instead of a bolt gun, these consistencies (in my experience) open up even further.
Other factors that result in wonky results on paper~scopes not holding zero, scopes not tightened down, damaged crown on the barrel (careless cleaning and/or manufacturing defect)