M1885 Browning "Low Wall" certainly is a work of art. At a MSRP of $ 1,289 it would need more that looks to attract me.
There are concerns about the practicality and/or usefulness of a M1885 Browning in 357 Magnum. Among those concerns would be: (1) the small case capacity; (2) the 24" barrel length.
Let's face it, the .357 Magnum is a handgun caliber and just does not have the powder capacity to generate higher velocities in longer barrel length. Probably the 18" barrel would be the maximum useful barrel length for the .357 Magnum. Personally I would prefer nothing longer than a 16.5" barrel.
Given that factory handgun ammo uses relatively "fast-burning" powder, the powder charge will be burned out before 18" of barrel length. Furthermore, reloading the .357 Magnum with relatively "slower burning" powder would not be practical as this powder has more bulk (takes up more space). The smaller case capacity of the .357 Magnum is not suitable for "slower burning" powder.
Finally, you should consider that the velocity of a .357 Magnum having reached the maximum in approximately 18 inches the bullet will likely begin to slow down in a 24 inch barrel. You could actually lose velocity in a longer barrel.
One year ago I was considering a Winchester lever rifle in .357 Magnum. The barrel length was 26 inches! It was a beautiful rifle but the question remains: How much more or LESS FPS will I get from 26 inches as compared to 18 inches? Well I passed up that Winchester. Longer barrelled rifles in .357 Magnum are just not practical.