Providing Merit System Services Under contract with the California Department of Human Resources (CalHR), CPS HR Consulting (CPS HR) is charged with administering the Merit System Services (MSS) Program for county Departments of Social Services and Child Support Services in compliance with federal and state merit personnel requirements.
The Mossberg 590 holds 8 shells in the magazine plus 1 shell in the chamber for a total of 9 shells. This is when using 2 3/4 inch shells. Reduce the capacity by 1 when using 3 inch shells. The 8 shot Model 500 Persuader holds 7 in the magazine and 1 in the chamber for a total of 8 shells.
It will fit 25 or 26 grams to the maximum. I find that anything between 22-25 grams grams produces an alarmingly strong double shot (assume 60ml max extraction) in 30 seconds. Great if you need to stay awake all night!! 8^) So I only use it when my friends want a tripple ristretto.