The below captioned website provides information on shotgun "chokes" and shotgun patterns

https://www.hunter-ed.com/montana/st...027_700048225/

Yes, shooting trap or skeet is tough with a twelve gauge shotgun.

I once was stupid enough to shoot 50 rounds at a gun club with my 12 gauge Ithaca Featherlite. My shoulder was very sore and black and blue for almost 2 weeks.