I have a friend that uses that choke in an 870 special purpose with 3.5-2-5 Winchester hv's and he says it patterns very well at forty yards. I have never seen the pattern and don't know what kind of numbers he's getting, but I know he never has crippled birds and he fills both tags every year with that combo. I have the same gun he has but with a Hastings .650 and it does good with the win 3.5-2-5's also. I'm going to run some 6's through it this weekend, I think I'll have a little better numbers. But I can't complain about the way the 5's pattern through this choke. Low 100's in ten at 40.