I agree, just load them and crimp to the cannelure and stop obsessing.
In this particular situation, it's kind of simple.
Use a bullet intended for .30-30 usage . Crimp into cannelure (crimp groove) .
The .30-30 ctg , and the feeding requirements of the teo overwhelming Iconic platorms are well know to component mfgz, and they figured out the issues 100 years ago.
If yoiu were to use .30-30 bullets in other ctgs , or load pointed bullets for single loading in a lever , then you would have to deal with C.O.L. issues.
I didn't think I was "obsessing".