Hello, I think the main problem with the .44 Colt and American ctgs. was the fact they used a heeled bullet. The Russian officers who took part in the big buffalo hunting party of 1869, liked the big S&W topbreak..but not it's ammunition..they insisted on an inside lubed bullet..which resulted in the excellent .44 Russian...the forerunner to the later .44 special. Outside lubed ammunition was/is a mess to handle..especially in hot dusty conditions of the west
If you will examine Russian made ammunition of the period you will find it was outside lubricated
, not inside lubricated as is generally supposed. They did eliminate the heeled bullet, but it remains whether they actually designed that or not. As to inside lubrication, it appears that UMC was the first to introduce that.