found it
It was not Guns & Ammo, but, ........Handguns, Feb '98.
Author Ed SANOW, who was doing a lot of velocity and expansion articles about that time, published an article entitled "BP Stopping Power".
A table therein shows a repro, Colt Walker, loaded all up w/ 60 gr of BP and a 141 Gr roundball, produced a muzzle velocity of 1287 fps w/ 519 foot lbs of energy. They did not shoot a Dragoon (which I mentioned earlier), but a dragoon w/ 50 grs bP would be in the same league.
The gelatin tests yielded damage which the author equated to .41 magnum full power 175 gr hollowpoints. SANOW states that "only recent developments in high performance hollowpoints allows some modern ctgs to equal or exceed" the Walker.
Pretty nifty article.