I am selling my Nova on on GB and selling/trading the choke separately. .562 as seen in the pictures. I have not tried it with any TSS loads so no idea how it will perform. I've had it on my gun shooting the old Federal Heavyweight in size 7 and it did in the mid 130's for me. Would like to trade for a premium choke tube for my Remington 20 gauge. Jebs, Sumtoy, Indian Creek etc etc. Open to various constrictions but would prefer something in the .560 to .575 range (.570 Sumtoy is preferred). Let me know what you have available.