Are the modern replicas made in exactly the same calibre as the originals?

If so the .36 & .44 was sometimes the bore size, the distance from lands to lands and the rifling grove was .38+ and .45+. It causes no end of confusion when collectors try to match a cartridge with a gun from the old west.

The Colt 1871-72 was a .44 Henry rimfire and had a bore size of .42 and a grove size of .44. The actual bullet diameter ws .443 so had a bit of seqeezing to be done.