Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Hopkins & Allen Underhammer

Discussion in 'Blackpowder' started by Ray P, Jan 17, 2011.

Thread Status:
Not open for further replies.
  1. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Just bought a .36 H&A underhammer rifle, and since Numrich isn't making them anymore, there aren't many places to go for maintenance & cleaning tips for these neat guns.

    I've searched a number of gun forums, and read through all pages of the Underhammer Society blog, but haven't found answers to a couple of questions...

    1. Do you generally dismount the barrel from the half-moon "receiver" for cleaning, or is it better to just use a siphon tube? OK, I know it is not a true receiver, just couldn't think of a better name for that block of metal holding the barrel, stock bolt, and trigger group pins together & in alignment.

    2. Are the nipples long-shank, 1/4-28 or metric, or some other unique design? The shank looked kinda long, and the threads don't match up to a 6Mx0.75.

    3. Why are Hot-shot nipples mentioned as something to avoid with underhammers?

    4. My 3rd Edition Blackpowder Loading Manual doesn't show the .36 H&A, and I don't have the original owners manual. Can I assume 30-60gr FFFg as a reasonable load range for patched round ball? Oh. Using .350"D rb & 0.015" patch.
     
  2. BHP FAN

    BHP FAN Member

    Joined:
    Sep 23, 2008
    Messages:
    5,810
    Location:
    Northern California
    mine is a .58, but in answer to one of your questions, I have never dismounted the barre...it's just not nessesary. After a few passes with a bronze brush to loosen up the crud, I pull the ramrod up and down with very hot, slightly soapy [dish soap] water in the barrel, and a bit of rag around the jag, and it acts as a sort of piston.Do the same with plain hot water as a rinse. Wait a few minutes for any water to dissapate [it won't take long if the water was hot enough] and wipe down the inside of the barrel with a slightly oily bit of rag on the jag, and a wipe down of the outside metal with a paper shop towel with a spritz of WD40 on it, and I'm done.
     
  3. fogg64

    fogg64 Member

    Joined:
    Jun 6, 2010
    Messages:
    60
    Location:
    West Sacramento, CA
    Mine is a .45 cal. I haven't dismounted the barrel simply because I haven't figured out how. I use the siphon tube to a container of hot soapy water and then use a patch on the jag. I use some more patches to dry it. I use bore butter finally but there are other products if you like.
    There was a longer shank nipple on it when I got it but I was getting misfires so I changed to a shorter shank and that helped.
     
  4. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Thanks for the responses.

    Siphon tube it will be :) Those three setscrews were looking a bit intimidating, anyway. Not quite as simple as the hooked breach and wedge pin of a TC.

    Came across more info while shopping for a cleaning nipple. Track of the Wolf stresses Numrich rifle nipples are 1/4-32. After close inspection and comparing it to known-size nipples from my TC & Lyman guns, the H&A nipple measures as a standard shank 1/4-28 thread. Also looks pretty clean & un-hammered, which makes me think the previous owner just shoved in something close enough to fit in order to trade it off. I don't feel I'm getting good thread engagement. Think I'll need to pop the forearm to give the barrel threads a closer look for evidence of cross-threading.
     
  5. PapaG

    PapaG Member

    Joined:
    Sep 12, 2010
    Messages:
    2,076
    Location:
    Il
    Don't dismount the barrel. The barrel is held on with a tapered pin through the receiver and breech plug tang. Continued driving in and out will cause it to become loose. Numrich has some parts for these.

    If you must pull the barrel, look at the pin to determine which is the big end and drive out from the other side.
    Nipple "should" be 1/4-28 and I can think of no reason not to use a hotshot nipple. It is further away from your face than on a sidelock.
     
  6. moose owner

    moose owner Member

    Joined:
    Aug 4, 2010
    Messages:
    19
    Location:
    Denver
    I have a 58 caliber H&A too. The tapered pin which holds the barrel in place is often very difficult to get out. So, most people clean the barrel while it is attached to the receiver. I pretty much destroyed the tapered pin when I decided to drive it out.

    If you look at the Fire & Iron Manufacturing “H&A” Actions, they use Allen socket screws to hold the breach plug and barrel in place (as apposed to a tapered pin). Removing the Allen screws is easy, making it possible to quickly remove the barrel for cleaning (or changing out the barrel).

    I modified my H&A to also use Allen screws to hold the barrel/breach plug in place. I also fitted a 12 gauge shotgun barrel to my H&A so I can shoot it either as a 58 caliber rifle or a shotgun.
     
    Last edited: Jan 21, 2011
  7. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Think I read in the Underhammer Society blog Numrich changed from taper pins to set screws towards the end of production. My .36 has the setscrews, but I think I'll avoid dismounting it, at least for a while. Siphon-tube cleaning it shall be.

    PapaG; you're right on the thread size; 1/4-28 it is. Did pull the forearm off today, and gave the barrel threads for the nipple a close inspection. Under the 10x loupe, they looked fine. No evidence of cross-threading, just crud in the threads where the std-length nipple doesn't reach. Chased the threads with a 1/4-28 bottoming tap, and didn't sense any problems. Maybe that brass cup is just throwing off the feel a bit.

    Maybe it was in the US blog back pages, but I did see one guy cut down his .58 H&A to canoe gun length; looked VERY impressive!
     
  8. BHP FAN

    BHP FAN Member

    Joined:
    Sep 23, 2008
    Messages:
    5,810
    Location:
    Northern California
    I would but then that 40'' brass scope would just look ridiculous...

    [​IMG]
     
  9. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Nice! Shadows at the action is throwing me off a bit; what is the one on the top?
     
  10. BHP FAN

    BHP FAN Member

    Joined:
    Sep 23, 2008
    Messages:
    5,810
    Location:
    Northern California
    Whitney Rolling Block .38 Short Colt Cadet's or training musket that some goober sportered.
     
  11. Hanshi

    Hanshi Member

    Joined:
    Sep 25, 2010
    Messages:
    731
    Location:
    Virginia
    [​IMG] Mine is a .45 built in the mid 1960s. While yours may be some different, I always tapped out the pin and removed the barrel for cleaning and I've had the rifle for 45 years. It still fits together as tight as when it was new. I usually tap out the small pins and remove the fore end but it is not always necessary to go that far. I recently had to (temporarily I hope) retire the rifle because it needs a new tg, which as you know, powers the trigger and hammer. I guess I need to start seriously looking for one.
     

    Attached Files:

  12. BHP FAN

    BHP FAN Member

    Joined:
    Sep 23, 2008
    Messages:
    5,810
    Location:
    Northern California
  13. Liberty1776

    Liberty1776 Member

    Joined:
    Dec 28, 2006
    Messages:
    1,306
    Location:
    Minnesota
    My barrel is not held in place with anything. It just screws on the threaded action shaft until it butts up against the action face and the sights line up straight. Am I missing a piece on this gun? (haven't fired it yet...)
     
  14. goon

    goon Member

    Joined:
    Jan 20, 2003
    Messages:
    7,251
    Don't know if this will be of any help here... but the barrel on my Bess and many other muzzleloaders also doesn't dismount for cleaning. What I do is plug the vent with an old fashioned match and fill the barrel full of hot soapy water from a pyrex measuring cup. Drain, repeat, drain, scrub like hell, dry, and oil. Seems to work.
     
  15. Mini30

    Mini30 Member

    Joined:
    Dec 16, 2008
    Messages:
    53
    @BHP Fan: Wow. I thought BlueGrouse was dead & gone.

    @1776: Is your underhammer an H&A action? Got photos?

    @ Goon: Been known to do it the old-fashioned way, but guess I got lazy with the hook breach :)
     
  16. MutinousDoug

    MutinousDoug Member

    Joined:
    Oct 24, 2005
    Messages:
    865
    Location:
    Colorado
    The Bluegrouse site seems to still be active but nothing appears to have been added since 2004 or so?
    Anybody heard from him?
     
  17. Mini30

    Mini30 Member

    Joined:
    Dec 16, 2008
    Messages:
    53
    Last edited: Jan 25, 2011
  18. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Fun to shoot!

    Took the H&A to the range today, and she operates rather nicely. Got 1-1/2 grouping using 40 gr FFFg at 50 yds; tighter than the 30 gr & 50 gr loads. The patched ball dragged at a few spots on loading, but that smoothed out after a few shots. Patches looked good; no cutting or burn-throughs.

    Pretty sure if I bring the right glasses with me tomorrow, I can tighten that group up considerably. Will probably try some weighed Triple 7 FFFg for consistency, too.

    Oh. Got a flushing nipple for cleaning from Track of the Wolf, and that worked very well.
     
    Last edited: Jan 30, 2011
  19. junkman_01

    junkman_01 member

    Joined:
    Aug 7, 2009
    Messages:
    1,728
    Location:
    Florida
    Triple 7 is much lighter than BP for the same energy. You must reduce your load by 15% VOLUME to achieve the same result as BP. Be careful you are not overloading when using 777. Use a volume measure.
     
  20. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Junkman 01; You are absolutely correct. I just gave a short-hand description.
    By volume: the Lee slide rule says (FFFg) 30gr = 1.9cc, 35gr = 2.2cc, 40gr = 2.5cc, and 45gr = 2.8cc (rounding to the nearest 1.0 gr).

    I take three carded samples of each, weigh & average, and that becomes the value I store in the chargemaster for future use. I've done this for Pyrodex RS !ONLY! after Hodgdon published it is acceptable to use smokeless powder dispensers for Pyrodex. I then either build paper cartridges, use speedloaders if I'm in the woods, or bead tubes if I'm going to the range. But all this has been for my .50 Hawken or .58 Enfield Musketoon

    ****DON'T****DON'T****DON'T****DON'T ****DON'T****
    Do not put actual black powder in a dispensing system not specifically designed for black powder!
    ****DON'T****DON'T****DON'T****DON'T ****DON'T****
     
  21. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    And a 15% reduction by volume becomes...
    Lee slide rule says (FFFg) 30gr => 25gr = 1.6cc. 35gr=>30gr = 1.9cc, 40gr => 34gr ~ 2.2cc, 45GR =>38gr ~ 2.5cc (roundingby 2gr for the nearest dipper).
     
  22. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Here is the H&A at the range today.
    [​IMG]
     
  23. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Also, Here's a shot showing 2 of the 3 setscrews which I believe replaced the taper pin in later models
    [​IMG]

    Got to say I have a lot of work ahead of me re-learning the basic techniques. This thing is very sensitive to variations in loading pressure. Just not as forgiving as a 350+ gr maxi over 110 gr RS. :)

    This is a fun gun to shoot!
     
  24. Newtire

    Newtire Member

    Joined:
    Jul 7, 2007
    Messages:
    4
    Location:
    Boulder Creek California
    tapered pin which way to drive out.

    I was disappointed in that noone ever said which direction you drive the tapered pin to drive it out. Normally, it's the same way to drive out dovetailed sight I thought. I heard it said "Drive it right out unless you want it left in"

    Right as looking towards the muzzle with the gun top side up. been trying but having no luck.. Want to convert it to use set screws to retain the barrel.

    Any help would be appreciated!
     
  25. Ray P

    Ray P Member

    Joined:
    Jun 2, 2004
    Messages:
    337
    Location:
    NM
    Sorry I can't help you, Newtire. My underhammer barrel is retained by set screw, not taped pin.
     
Thread Status:
Not open for further replies.

Share This Page