Roman,

I shoot an Ithaca mod 37. I had an extra 30 inch barrel given to me several years ago that had a "polychoke" on it. That's an external choke that is variable by twisting a constrictor on the end of the barrel. I had that cut off down to 24 inches and tapped and a choke tube inserted. The gunsmith put in a "Colonial" TSTK2 which was a XX-Full. It shot like crud! Holes all in the pattern! I figured it was too much constriction, so I got him to switch it out last week for a TSTK1, or X-Full. It patterns well, but high. Actually, it shoots fairly consistently with 4's, 5's, or 6's. I tried Super-X and Remmington since that's what I already had. I see no reason to change.

The only downside to this tube is that it is threaded EXTRA fine, so I can't substitute any of the aftermarket tubes in it. He said that he had to go with that one because of the thickness of the barrel where he cut it off.

I am considering getting Ithaca to build me a "Quad Bore" in their custom shop. That is a 4-stage constriction down the entire length of the barrel. Ithaca says that this allows the shot collumn to string out and hold a much tighter pattern. I just need to work out a price with them - and then justify it to my wife.[]