Hodgdon's Trail Boss works reasonably well in all normal rifle ctgs. and will not produce pressures, it seems, over about 28,000psi - and pressures that high seems only in the large case, small bore rounds like the .300 magnums shooting 180gr. jacketed bullets.
A full case of it (6" drop tube) in my wildcat .375 - 80gr. capacity case, with a 310gr. cast bullet, produced only 1,380fps and no pressure to speak of - go-pow - load, like a very soft cast bullet load.
I've used 15gr. TB in a .45/60 (.45 1.9") chambered Sharps with 385gr. cast with no problems and 1 1/2" to 2" accuracy at 100 meters off the bags. It was a 100% loading to the bottom of the bullet. I was able to seat the bullet out to about the same
OAL as a normal. .45/70 due to the 3/8" leade (throat) I put in my chamber.
In the .50/95 Uberti for a top load, quite safe in the 76's - likely new or old, 100% to the base of a seated bullet is the max. load. It will be a go-pow load, with very low pressure, likely under or at 20,000psi and might produce about 1,150fps - with about any bullet weight.
I just uploaded and printed off a chart of "Modern Uberti 1876 ONLY, 28" barrel" data:
Pressures calculated using Quick-Load, running from 20,000psi starting loads to 26,000psi for the maximum loads.
http://1587510142.rsc.cdn77.org/RRoom/researchsheets/50-95,%20Uberti%201876.pdfThis data is for cast 339gr. as well as 300gr. and 450gr. jacketed ammo, using Bertram brass and Federal 215 magnum primers.
I am going to start using 5744 as I was able to find 3 pounds of it and will start at 38.0gr. and work from there, with my 368gr. Lyman mound.
I expect 1,600fps for the starting load and perhaps 1,700fps for a working max.
Last summer, I was able to get into the dirt underneath our 1,000meter buffalo target with my last 3 rounds. I use a Smith sight.
This is the sight, available from Smith in Oregon or from Brownells - same price, $169.00. The detents between the 100yard marks make for repeatable sight settings for long range shooting. I was using 52.0gr. N44 AmmoMart powder, with the 368gr. Lyman bullet, for 1,650fps with a thin beer-box card wad between powder and bullet, Fed 210 primers. My rifle likes this load and those last 3 rounds at the 1000metre buffalo appeared to drop into about a 3 to 4 foot group. Next summer, I'll ring that fellow. 4' x 8' buffalo He has no legs below the knees and is mounted, hanging on chains, so he rings with a bullet hit. Brother Taylor got on him with his .50/90 Sharps, 600gr. Buffalo Arms bullet and 91gr. Swiss 1 1/2.