Ammo company's have ammo assembly lines that move so darn fast that all that is needed is a single minute and there will be a large amount of "bad" ammo. It doesn't take long!

I believe that CCI standard velocity ammo is one of the very best 22RF out there. That said, I have over recent times had a bad couple of boxes of 50 where I have had 6% -10% failures to fire. After those few specific boxes, the remainder of the brick was perfect as usual. So..... it happens to even the best.