Since it is a new rifle, run a couple of boxes of CCI Stingers through it first, then try any of the above mentioned Brands. I use Federal Bulk packs.
Be aware that when you disassemble it, and then go to re-assemble the 597, there are two screws that hold the guide rods in. Just tighten them FINGER TIGHT, until you can feel them stop, then back off 1/4 turn. If you tighten them too much, it will bow the guide rods, causing them to rub on the breech block and this will cause failure to fire, failure to feed, short stroking and other undesirable things.
Also make sure the recoil springs do not bind after you have put them in. The newer models have an enlarged end but the older ones can cause binding if they are assembled without a bit of care.
Go to rimfirecentral.com and check out the 597 section of the Forum. Lots of good information there.
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