PDD,
Your friend should have his gun rechoked to skeet/modified and use #8 shot, limiting his shots to within no more then 25-30 yards. Full chokes on .410s are based on faulty logic that since the shot load is so small it must be concentrated. Full chokes might be okay for squirrels, but that's about all. Based on current technology, the .410 is not a reliable 40 yard gun, with that in mind having a full choke is useless.
Just my not so humble opinion.
Steve
PS I had a .410 NS and the modified choke gave beautiful patterns at 25-30 yards.
