This question could be broken down into two parts:

• Can you define a shot shell performance i.e. velocity, hardness of shot (such as trap, or tungsten, or hevishot for water fowlers), amount of shot?
• How about a Ruger Red Label 28 gauge configuration (for example), could this be modeled?

Yes, in the User’s Table you will create the shell that you want to shoot by selecting the muzzle velocity, the shot size, and the weight of the load.