I would call some of the small manufacturers of TSS loads and check on the wadding. Usually the wads are so thick there is never any contact between the shot and the bore. Number 9s in TSS (what I use) inside a thick wad cannot hurt anything, and they will load you lighter loads. There really is no need for 1 3/4 ounces of TSS 9s in a 3" or even 1 1/2 ounce in a 2 3/4" 12 gauge. You may find that they have 1 1/8 or 1 1/4 ounce TSS loads available. I loaded 1 1/4 ounce of TSS and shot it through a vintage Parker and Ithaca NID and also 1 ounce in 20 gauge and shot it through a Sterlingworth and a Trojan. No damage due to the shot being so small. double wadded, and the load is completely enclosed and actually far down inside the wadding. One ounce loads of TSS contain 362 pellets, and have the energy of 5s. That's why people are killing turkeys at 40 yards wit a .410 and 15/16 ounce.
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