I must just be the fortunate son, so to speak. My 15-22 digests everything I feed it, and I think that should be the norm, not the exception. Here's what I've fed through mine (all High Velocity, no sub sonic):

a. Rem HV, 40 gr bullets, 150 rounds, zero problems
b. Rem GB 550 round Bonus Pack, 36 gr, no problems except for one round that didn't go off (dud) but had a definite firing pin strike
c. Rem GB 525 round Value Pack, 36 gr, no problems
d. Rem Thunderbolt, 50 rounds, 40 gr, no problems
e. Win 555, 36 gr, no problems
f. Win Super X, 40 gr,150 rounds, zero problems
g. Fed 550 round Value Pack, 36 gr, 4 duds, 2 rounds with bullets that were bent with respect to the case (didn't chamber right?)
h. CCI Stingers, 32 gr, zero problems.