hi im new to this hunting scene but im already having lots of trouble its not as easy as i first thought ive got a benelli m2 3" 12g auto and im planning on going to scotland in september ive been told that the geese fly so high up there that i need full choke and im only allowed to shoot steel but on my choke it says NO STEEL im confused what do i do??? ive been told i can buy aftermarket "Full" chokes that can take steel but i dont know where from, what to look for (material etc...) or even if i need them i dont even know what steel cartridges are best for geese shot size grains etc... aaaaaahhhhhhh!!!!!!

this probably sounds so simple for alot of you out there but remember im new to this so ANY help will be much appreciated

thanks