I've got a 2" Tracker but only have about 100 rounds through it so far. Seems to be holding up okay, but ask again after another 500 rounds or so...
Of course I'm loading 240 gr.cast boolits to only 850 - 900 fps so it darn well better be able to handle that for a very large number of rounds!
Boy I hope GB doesn't read this post...
BTW I just reamed out the cylinders. The bore slugged out at .430 and the cylinder throats were .4285.
Reamed 'em to .431 and will put another 30 rounds through it this weekend.