OP, thousands of rounds of HTL turkey loads have been shot through tight turkey chokes with NO damage whatsoever (except to the heads of a few gobblers ). I shoot TSS out of both a 555 and 560 chokes, 1 5/8 loads of 9s, i also reload the Federal heavyweight 7s into an 1 5/8 3in 20ga load. No damage. Try the Trulock or Sumtoy, you won't be disappointed