2Smoke
Well, yes. You are in hot pursuit of something that doesn't need to be chased. In a '73, either Uberti or Miroku, a combined OAL of 1.500 is meaningless. Completely unnecessary. Don't waste your time nor the Folding Green for the Calipers.
The ONLY consideration is whether the follow-on round has its rim well over the return ramp of the Carrier Block. So long as the Follow-On round meets that criteria, your gold.
SO: You will find, the commercially available 125Gr and 105Gr Truncated Cone bullets have a crimp groove. Crimped in the crimp groove, they are perfect in an 1873. You will also find you have quite acceptable accuracy with those bullets. One commercial bullet supplier even named the 105Gr TC bullet "The Snakebite." The 105Gn and 125Gn TC bullets are the most common bullets used in CAS.
ALSO: In a Tube Magazine rifle, a Taper Crimp is completely UNACCEPTABLE. It is only a matter of time before you are introduced to "The Turtle." The bullets will begin to telescope back into the case, naming the rifle. Plus, a Taper Crimp does NOT retain the bullet in the case long enough to promote really good ignition with CAS normal reduced charges.
Relax. Reload. Enjoy and put those calipers someplace safe and out of the dust. It is also unnecessary to use 357 Magnum brass. 38 Special brass will run hic-up free so long as the follow-on case rim is over the return ramp on the Carrier Block.