The 243 can be a bit hard on fur but puts them down to stay. Make sure you always cover the down wind approach cause thats the direction they will come in from 98% of the time. Most yote hunting success will depend as much maybe more on your setup.Watch the wind and stay still or move very slowly.
As for elec. calls I just got the new one from foxpro
called the spitfire 199.00 and they will load 24 sounds of your choice,it is replacing the Johnny stewart preymaster 3. checkout www.allpredatorcalls.com
. As for mouth calls a simple closed reed rabbit like a weems knockoff type or a catnip is good to start.
Good luck and have fun.