PRHI, 10 round limit for magazines that can fit in a pistol. Thanks to the production of the Ruger Challenger pistol, magazines for the Ruger 10-22 Rifle that hold more than 10 rounds are illegal under the letter of the law.
Loaded magazines and/or ammo must not be in the same case of the firearm (as in touching the firearm). If you have a range bag with seperate pouches, you can have the firearm in one pouch, and the ammo and/or loaded magazines in another pouch.
PRCA, all gun cases must be locked, including soft cases a.k.a. "gun rugs", when transporting firearms.