Ill second that.... the Federal 525's are good, but the best so far for me have been the Winchester DynaPoint GT. The other cheap winchester xpert HV is the worst so far, especially in my Marauder. It wont chamber, the rounds seem to "stick" coming out of the mags, as their uncoated lead bullets. they just plain suck.
BTW, what kind of accuracy were you getting with the CCI Stingers? Im curious....