So, I got out my dial calipers and measured the shells and compared the actual measurements to the SAAMI specs for 10 ga 2 7/8 shells.
Good to know about the tight chambers in some antique guns. I have two 10 ga. hammer Parkers, and the Track hulls fit perfect. Out of curiosity after reading your post, I measured my Track hulls, and they all come in within SAAMI specs. Granted they were towards the high end of the tolerances, but well within specs. After talking to the guys at Track when I ordered them, I know they are a fairly new product for them, so it could be possible they have tweaked tolerances on them after getting some feed back about the fit in other guns. The problem with antique guns (especially antique 10 ga. guns) is that they rarely conform to modern specifications.
I guess the only way to know for sure is to take a chamber casting of your gun and compare measurements.
