Rimfire firearms are notorious for being very finicky, performing well with one load of ammunition, and then failing miserably with another. It is typically a gun-by-gun phenomena, and you can’t even say that “gun ‘X’ by ‘Y’ manufacturer will shoot ammunition load ‘z’ accurately” and have that blanket statement be true.
Check it out:
For this reason, I’m extremely leery when I hear someone claim that a given brand of ammo is “junk” based upon shooting a couple of boxes through one firearm (or even several firearms) in one range session. The reality of the matter is that there are at least four main variables in play.
Each and every one of those main variables has tons of sub-variables of their own.
Is the barrel of the rifle in good shape, or has it been neglected, or somehow damaged? Is the barrel clean, or fouled? What is the condition of the chamber, and the quality of the sights or optic?
Is the shooter tired? Over-caffeinated? Distracted? Skilled? Consistent? “Technique-challenged?” What position is he shooting it? Is the rifle being fired supported or unsupported, and is the barrel touching something, or is it free-floated?