Steve,
They are 'h' for stout good guns. Model pref is a personal thing, but from the model 100 up all are very well made & should not have any issues w/your intended use. You might wish to consider pulling the stock & sealing the head and giving the locks a clean & lube, but otherwise I see nothing to find worrisome. BTW, I believe those bbls. were chrome lined originally, so give the choke work a good inspection to insure it wasn't a butcher job.
I'm in complete agreement w/James' assessment.
Best, tw
