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I have a 20" M94 in 45 Colt, which I like the looks and feel of (as the 16" trappers feel too short to me).  Anyway, I also have a 5.5" Ruger Blackhawk in 45 Colt.  I chrono'ed some loads last weekend out of both.  The bottom line was:

Pistol - 1200 fps
Rifle - 1564 fps

(these are the average velocities of the 5 shot strings I fired).  With a 364 fps difference and a 14.5" barrel length difference, the "velocity per inch" is 25 fps, so you are giving up maybe 100 fps with the 16" trapper (at least with the loads I chrono'ed - which happened to be 22.5 gr WW296 and a 300 gr lasercast bullet)

Hope this helps.

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