Thanks, gents; I should be ok then. Just didn't want to unduly stress the receiver. The ammo 'came down' to me, and I know nothing about the bullet weight. I ought to pull a round and check out the components. Once the smokeless I have on hand is gone, it'll be BP from now on.
Really wrung out the Henry this afternoon for the first time, or maybe it was the other way around. Trying to come to some accomodation with the sights, I fired 100 rnds BP (Great Basin 200 gr) and 40 smokeless (Win 225gr). I just can't see that rear sight except in gross fuzz mode. Once I kind of figured out how to 'remember' where the top of the rear sight was relative to the front, I got 2" groups (but this is only a little 25-yard indoor range).
After a whole bunch of BP (40? 60?), I felt as though groups were falling apart. It was probably me needing a break, but just for the heck of it, I put together a brass rod and ran windex/vinegar on a double patch down the bore a couple times, dried it, and resumed shooting. Bore didn't seem especially crudded-up; it seemed to help, or maybe I was just rested.
Never felt the call of a tang-mounted peep so powerfully - I don't think that would 'look right', but man, did I need one! Anybody doing that? How un-cool would that be?
WT