I have three Victorian and George V era movies in my collection: Gunga Din, Zulu, and The Drum. In all revolvers are carried butt-rear strong side. The way they are carried appears to me to be perhaps the slowest and most uncomfortable location. Drawing and holstering, again, appears to me to me unusually unintuitive for using.

Why are these flap holsters not carried as vertical cross-draw or at least vertical strong side?

Butt foreword cirri me was the Calvary draw. It should be worn on the left side It allowed the saber to be drawn with the right hand. The saber was the predominant weapon.

It works great on a horseback or setting. I use it on the right side.

The draw is not as fast as vertical butt rear, but is not uncomfortable. Straight up, bring barrel out away from body, rotate wrist or drop elbow.