I’ve had it for many years, I’ve shot it countless times.
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The .45-120/3-1/4" with a free bore chamber can be a head scratcher, I been down that path :D but it can shoot very well. semtav gave some good advice with the bullets patched to groove or snug to the free bore diameter, this is what I had to find to get it shooting well. Also controlling the recoil and torque will be a must thing to master.
Also match the bullet length to the twist of the rifling like Don said. But again the ogive profile even with a proper length can and will be an issue with conditions.
Enjoy the ride and keep notes. The memory chips between the ears seem to get overloaded with time. :D