I bought an Eibar 10ga sxs for geese about 25 years ago after steel shot first came out. I knew the full chokes would be too tight, so I found a gunsmith who was willing to work with me to get the best chokes. We reamed them out about 5 thou at a time, then I would pattern it over the weekend and bring the gun back. It was interesting watching the pattern shape and density change with each ream. The original pattern was an oblong group with a very tight center and no shot at all in two of the 30 inch quadrants Finally got a perfectly round evenly dense pattern of 73% with steel BB's in the Federal 1 5/8 oz load, which tightened up to 85% with T's. I reamed the right barrel one more time, and it opened up to 66% with BB's and 75% with T's. That's where I stopped. I have killed many geese over the years with the BB's out to 60 yards, many in as close as 30 over dekes, and never felt the need to shoot T's. The BB's killed them dead at 60. The only downside is the gun weights 10 1/2 lbs with 32 inch bbls and reeling it up out of the pit is like deploying the guns of Navaronne. Takes a little time, but once its on, it hits. The point of all this is I would recommend the cut and pattern approach to reaming out your chokes, instead of taking a blind cut and hoping it gives you what you want. I suppose choke tubes would give you the same look and see option. Good luck.
