first thing is to pattern the gun with different shells at different yardages.
then you will know "Yourslef" what it will do.
That being said,I had an over and under 20 ga. over 22 mag.an awsom little gun.the max range from that gun was 30 yards.I used 3" #6 copper plated.I took several birds at 30 yards or less.

the real game is to get them into the best range you can,"CLOSE" is the way I like it.[8D]