I have used Trail Boss Successfully in my Martini Henry. Almost to the end of my "load Development"
According to Hogdon, use no less that 70% case capacity to up to 100%. They claim you will not get into trouble with any cartridge with that advice. (I called and spoke to their tech specifically about my martini.)
There is less power in it that equal volume of blackpowder according to them.
Remember the original load in a MH was only something like 80 or 85 grains and did not fill the case because recoil was to great for the average military guy. I believe the carbines used an even lessor load. I have filled the case up or used about 75% of full and had good luck.
I can tell you from experience a full load of BP has more kick than a full load of Trail Boss. That is the problem with trail boss for some cart as you can't duplicate the power of BP with it. In the case of the reduced load MH, it probably is possible. I will Chronograph some of my loads I have been working on.
My problem has been trying to find a load I can use "legally" in CA non-toxic area for pigs..... I am just about there, when I finish, I will post my info, just for the heck of it.
Jerry
