1886, believe it or not, the rifle is completely stock except for a mild trigger job. Its not pillar bedded.
Madman, no disrespect felt on my end at all. Your right, there are certainly better cartridges for the job. In fact, the next visit I want to put my 375 H&H Ackley load with a 350 grain BT bullet at 2500 fps and has a BC of point 7 something and stays supersonic well past 1538 yards.
OTOH, its simply amazing what these old guns (Sharps, Hi Walls, Springfields, etc) can do. The way we do things at FoBD is there is an observation booth with someone in it who calls the shot impact back to the shooter by radio. Mic made a minute of angle grid with rocks so the information the shooter receives allows him to make adjustments.
The reason these old guns work is that the heavy bullet weight allows them to stay relatively stable as they cross the supersonic/subsonic barrier and the corresponding turbulence there. Light weight bullets at super fast velocities don't fair so well transitioning through that barrier.
I was also taught by these guys to keep a "brain book" as Torkelson calls it so I have an idea of what the sight settings and sight picture should be for different conditions. I also have a load that is extremely consistent (thanks Mic!) with a 10 shot string showing an ES of 17 fps and a SD of 5. Average velocity with the 485 grain bullet is 1170 fps. I don't think I could get that kind of consistency with BP.
There is some luck involved as wind and weather, even whether its sunny or overcast, can really change things. We have wind flags all the way down so you can see what the wind is doing. Sometimes I wait until the wind seems to have abated but in the seconds it takes for the bullet to travel that far, it can change in an instant.
I have it the target array twice in a row one time and seen others do it more than me. I'm a little limited because I have no adjustment for windage other than what I apply myself.
Really, its a truly remarkable experience to shoot out there. I purchased Old 3120 because I HOPED it was sort of be a "poor man's Sharps". While there are better rifles available for this purpose, its sort of cool to be using a rifle made over a hundred years ago and using it to its full potential.
-Tutt
"It ain't dead! As long as there's ONE COWBOY taking care of ONE COW, it ain't dead!!!" (the Cowboy Way)
-Monte Walsh (Selleck version)
"These battered wings still kick up dust." -Peter Gabriel