I thought the one Ross used was chambered in the .454 Casul-length case.
Linebaugh - yes - think that is the proper spelling. also had a .50 and .50 Spl. seems to me. The .50 SPL I found, was an interesting round, with ballistics closer to standard .44 SPL. handloads, but of course, a larger dia. & heavier weight bullet.

"ross seyfried did a great article about them in G&A March 1990.

he says it was one of hamilton bowen's designs. its based on a cut-back .500 which in turn is based on the .348 Win case.

it uses the same .510 bullets as its big brother. moulds were available back then thru LBT and NEI. bowen's favorite bullet was a 350 gr round nose. also used were the 300 gr jacketed flat point designed for the 50-70.

seyfried thought that round would be best with bullets in the 350-385 range. he liked using Unique in it and used 12 grs Unique to drive a 385 Flat Point Cast at 975 fps (he also got that speed with 23 gr of WW296).

back then bowen was converting redhawks and blackhawks to the 50sp.

i'm like you: they make a lot of sense to me. i've always wanted one. maybe someday..."