“Low Brass” doesn’t always mean “low pressure”, but if you stick with 1 ounce, or even 7/8 ounce if you can find them, you should be OK. My data from pressure testing 16 ga shells is now a little dated, but all of the 1 ounce or less factory ammo tested was less than 10000 psi except for Remington and Rio. Remington was about 10% higher, and Rio . . . Considerably higher.
