If your Trapdoor has the Buffington sight, and a decent bore, you ought to be able to place in the upper 50 percentile at the Quigley, if you can shoot it. A good Trapdoor gives away very little to a modern BPCR, and it's mostly in the area of sight repeatability.
The Buffalo is the longest range target, at 805 yards. A .45-70 will reach out there with no trouble.
Funny you should mention $3000 as your upper limit. My half-around, semi-fancy standard heavy, pack-hardened Shiloh #1 cost almost exactly that after shipping, Fed&State excise taxes and FFL fee was added. Target sights, scope and mounts were extra, of course. Worth every penny, though; I'm just glad I'm not a Boating enthusiast.
If you're coming to the Quigley from Washington State, stop in Big Timber on your way to Forsyth, and visit the Shiloh and C. Sharps factories. You'll have a much better idea of what you "need" after that. (Heh-heh!)
That's how I was inveigled into buying mine.