Question on revolver calibers

Dear readers,

I would very much appreciate an answer to these questions:

1.      
What was the groove diameter and the cylinder
chambers diameter

a.       of the percussion .44 Colt Army revolver
?

b.      of the percussion .36 Colt Navy revolver
?

c.       of the Colt Single Action Army ?

d.      of the Colt New Army 1892 ?

2.      
What was the throat diameter of the cylinder
chambers of the Colt Single Action Army ?

3.      
The Colt New Army 1892 didn’t have any throat in
ist cylinder chambers, did it?

As you can
deduce from my questions, I try to understand why the .38 Special sports
actually a .357 bullet, or the .45 Long Colt a .451/.452 bullet, or the .44
Magnum a .429 bullet.

May be the answers could be of interest for more than a
handful of sixgunners

Put on your thinking caps. 

Put on your thinking caps. 

DIMENSIONS

THE .38 AND .44 BULLET DIAMETERS GO BACK TO BLACK POWDER DAYS WHEN THE BULLETS  WERE ACTUALLY .36 AND .44. THE .44 CHANGED WHEN THE .44 AMERICAN BECAME THE .44 RUSSIAN. THERE IS NO SUCH THING AS A .45 "LONG COLT" BUT .451-452 IS ALMIGHTY CLOSE TO .45. YOUR QUESTIONS ABOUT ALL THE DIMENSIONS OF VARIOUS COLTS DEPENDS WHEN THEY WERE MADE. .45 COLT CHAMBER THROATS HAVE BEEN ALL OVER THE MAP FROM .451" TO .457"; SAME WITH SMITH & WESSON. RUGER WAS VERY TIGHT FOR AWHILE BUT LATEST RUGERS AND SMITHS GO AROUND .451" DIMENSIONS ALSO CHANGE AS TOOLS WEAR. THE NEWEST COLT I HAVE FROM 2013 MEASURES .454.

SIXGUNNER