I recently bought a 20ga single shot Ithaca/Lefever nitro express series 'field and trap' model because I like hammerless singles. This one is tricked out with a vent rib and a fairly modern Poly-Choke with ported section at the end.
It has also had the chamber opened to 3 inches. When I was a kid with nothing but a single shot .410 this combination was one of my fantasies.
I am considering using it with 3" Federal heavy metal or the new tungston super shot loads. My first question is whether the TSS would ruin the poly choke. Secondly, while there appears to be way plenty barrel thickness where the chamber was extended, I kind of wonder about damaging the gun (any more) with the heavier 3" loads.
What'd'ya think?...Geo
