just thought I'd post this here,
I had mine out on the weekend to try some different ammo options, factory mag.
Winchester bulk- jammed every mag once or twice, the lead bullet would catch feeding into the chamber (flat point/soft lead/loose round in case)
Remington hi-velocity- jammed once every other mag. Fail to fire. (primer/hammer)
Federal Bulk- blue box 525rds.- We shot about 450 rds. with not one failure (this stuff has the copper plated bullet).
ymmv- however my 597 really likes to fire federal bulk ammo.
accuracy was fine for my requirements. 4" steel plate, 50m consistant hits.
hope this helps.