Larry, His original question was essentially "Is my Thalmann up to the task of a trap league for 4 mos?" Bill said no one addressed his question.
Since I have seen many firearms loosened up by the rigors of trap shooting, I erred on the side of caution and just clearly said, "If you run 1600 (typical) trap loads through a SxS shotgun you'll feel the difference (accelerated wear)."
Partly because about 90% of the people I see shooting trap are just buying OTC trap loads at Walmart. Not RST's or Polywads. Only occasionally do I see someone with Featherlite's, usually teaching some kids.
People buy cartridges based on price. After all, if it fits in the gun it must be OK, Right? And if the base is only 1/4" tall, that's a soft shooter, Right?
I fully expect someone to ow come along and say, "BS, I bought an old Neumann Freres shotgun at an estate sale, and I've shot 10,000 high based trap loads through it, and it's tighter than when I bought it."
I unfortunately, with a dozen or more broken shotguns sitting around here, would say, I doubt it.