Sterlingworth said:
How do loose choke tubes effect patterns?
I think I would be much more worried about how some fraction of a shot charge and wad racing up the barrel at 1250 fps, might get under the loose choke's skirt and what it could/would do to the choke and muzzle! (Not necessarily a "one shot" deal, but a build up until it reaches a critical point.)
Ever see the results of such, with a choke not seated well? It ain't purty!
I think that any manufacturer that produces chokes that do not present some sort of "interference fit", or some means to mechanically do so, at the end of the threads/seating area, is amiss!
Some folks have notches machined in their chokes, others rely on heavy grease or just check them after every station. PIA!
I like the way that PolyChoke has theirs set up. No notches, but a small external, shallow hole in the external part of the choke barrel, and a small spanner wrench supplied with their PolyChoke II screw in models. Not only the best choke of the bunch, but the best tightening system as well.