Hi, reproofing is only needed if the forcing cones are altered in any way, if the chambers are re-sleeved or if thin walled multi-chokes are engineered into the barrel. For a fixed choke modification such as reaming and honing, luckily reproofing is not required.
In my correspondence with Teague, they did offer to steel proof certify my gun. I don't need this as it is Nitro proofed with the PSF mark and two asterisks, so I can shoot standard steel. For your interest, I have quoted part of their response to my initial email.
" The criteria for steel proofing are: choking at no more than half choke for standard steel or 1/4 choke for high performance steel shot, no pitting or markings inside or outside of the barrels and the barrels must be on the face (barrels tight to action, no play)."
Upon inspection of the barrels with their work on the chokes, Teague can offer to steel proof your gun and I think they would stamp as such.
Best regards
Gafto