Hatfield percussion nipple size

[rjpalmer]

I recently acquired a .36 caliber Hatfield percussion rifle and need to know what size nipple fits this rifle. Since it's missing the nipple I am unsure of the proper size . I am hoping it's 1/4 x 28 but know of the link to Pedersoli rifles which I am sure are probably metric. Does anyone know for sure the proper size? Thanks

[Bible Totin Gun Slinger]

I do NOT, but if you got the bbl, I'd find some screws and see what fits. 
Italian made units are 6mm. Lots of old stuff was 12-28

I know, I have a lot of em.
Looky here,,,,,
http://www.trackofthewolf.com/List/Item.aspx/807/2

[SCLoyalist]

I don't know for sure, but I'd bet on 1/4-28.   I've read the Hatfield rifle was originally produced in the U.S., so if you have one of those 1/4-28 would be likely.   Pedersoli's current  Blue Ridge Mountain Rifle takes (according to the Cabela's website) 1/4-28 nipple threads, and the Pedersoli website lists 1/4-28 nipples for some of their guns.   I'd probably try a 1/4-28, VERY carefully, but abort the test at the first hint  of resistance or cross-threading.    Good luck with it.  SCL