Ok, let's get it straight. Are we talking about a "Henry" rifle, as in an 1860 rifle (or replica thereof) OR are we talking about rifles manufactured by the company known as Henry?
There aren't a lot of 1860 rifles used in SASS because of (1) weight and (2) the loading tube mechanism, but I have seen some -- especially some BP shooters. The most popular rifles in SASS are the 1873, 1866 and 1892 Winchesters (but I don't want to leave out the 1894 Marlin....so now I haven't
). In the case of the 1866's and '73's, these are, of course, remanufactures which are mostly done by Uberti and sold through distributors such as EMF, Navy Arms, Taylors, Cimmarron, etc. The '92's are mostly Rossi remanufactures.
I can honestly say that I've not seen a rifle manufactured by Henry at any shoot with the exception of .22 youth models shot by the Buckaroo/Buckarettes (age 13 and under). I've fired a couple of the .22's but never anything else made by them, so I can't comment on them.
There's lots of considerations when deciding upon a rifle for SASS competition. My best advise, as I've given before, is go to a local shoot, shoot their rifles and decide what you'd like to buy from the experience you have. Believe me, everyone will let you shoot what they have. Ask lots of questions, look at your bank account, and decide from there.
Good Luck!
Tanker6 a/k/a Chickahominy Charlie