Fellers for all that wanted to know the Factory "XF" Remington choke measures .526". The 9.5 APEX TSS apparently loves this choke. It shoots best with a barrel that is dirty.
40 yards
(https://i42.photobucket.com/albums/e328/reflex264/patterns/28%20gauge%20pattern%2040_zpsku0m6pgz.jpg) (https://s42.photobucket.com/user/reflex264/media/patterns/28%20gauge%20pattern%2040_zpsku0m6pgz.jpg.html)
30 yards clean barrel
(https://i42.photobucket.com/albums/e328/reflex264/patterns/28-tss-30_zpsnxzgcou0.jpg) (https://s42.photobucket.com/user/reflex264/media/patterns/28-tss-30_zpsnxzgcou0.jpg.html)
30 yards fouled barrel. As you can see the dirty barrel at least in this gun is the ticket. Someone posted that so I had to try it. I shot a box of dove loads through it then shot another pattern. It made a world of difference, at least in this gun.
(https://i42.photobucket.com/albums/e328/reflex264/patterns/28%20gauge%2030%20yards_zpslbw71sxs.jpg) (https://s42.photobucket.com/user/reflex264/media/patterns/28%20gauge%2030%20yards_zpslbw71sxs.jpg.html)
I shot some dry paper catalogs at 40 yards with the #6 nickel plated lead pheasant loads I had been using and with the 9.5 TSS. The penetrations was equal for the most part with a few of the 9.5 TSS pellets going through about another 1/4".
Once again I apologize for not already getting this info for those that wanted it. About the time I was getting into this I had to take over the company I have worked for the last 35 years.