Ditto what others have said;
I have a Win. M94 "Heritage" w/24" bbl.
I would not have purchased this rifle, but won it in a pistol match.
It is a real "keeper" though.
After getting some brass and a single box of Magtech "Cowboy" ammo, I commenced shooting it.
Accuracy was approx. 2.5" at 50yds w/ open sights which I thought was acceptable. Velocity of factory ammo loaded to approx. 780fps MV for Colt replica revolver was 1,090 from 24" bbl.
Handloads were a "whole other thing"!
I worked up to the Nosler Max load for Blackhawks, Redhawks, and Contenders...... So, be wary if using these loads.
I got best accuracy with Alliant #2400, and Federal Lg.Pistol primers, in Starline Brass, and Hornady 250gr XTP (non-magnum). This is also the load that Nosler claims best accuracy with, and is their listed maximum load.
Accuracy at 100yds is a question of how accurate you can shoot the Iron sights. One five shot group went under 2", which would have probably been near 1" if shot with a scope. I actually embarrased another shooter on the line sighting in a Rem M700 in .270wcf with a 4-16X scope w/parrallax adjustment so bad, that he scoffed at the group I had fired, packed up his equipment, and stormed from the range disgusted with his rifle/ammo/group. I was told he sold that rifle the next week !!!!
My top load with a 315gr WFNGC (Lee's), uses 2400, and gets approx. 2" for 3 shots at 100yds also. The is the MOST accurate load from my 5.5"bbl Ruger Redhawk, which will occasionally give 5-shot one-hole groups at 25yds. Did I mention that recoil from this load in the handgun is "thrilling",.... meaning that if you are not careful, it'll try to smack you between the eyes! I can't imagine shooting a .454 Casull, with another 250fps!
Only caveate (regarding the utitlity of the rifle) is that the widely divergent velocities between handloads and factory, and High vs Low velocity, lead vs jacketed, limits the utility of the rifle. The factory sights are set up for approx. 250gr bullets at approx 1,000fps. In other words, for cowboy action shooting.
The velocity with the 250gr Jacketed "high-vel" loads is approx 1,600fps, or.... about like similar loads with .44mag loads from carbines. Ditto the 315gr WFNGC, or.... about 1,450fps..... about 200-250fps faster than a 5.5" Ruger Redhawk (mine).
Hope this helps.
NOTE: I did NOT give charge weights, as they would be unsafe in anything but the above mentioned firearms. Consult either the Nosler or Lyman manuals for respective charge weights. I did NOT exceed their listed maximums.