I started a couple of years ago reloading the 38-40 in a two OLD '73 Winchesters and three OLD Colt SA's, as well as the 44-40 in an 1866 Uberti Sporting Rifle and an 1873 Uberti revolver. I found out pretty quick that despite all the predicted gloom, doom and problems associated with reloading these cartridges, they're really quite simple to reload.
First, if they chamber in your gun(s) once, then they'll do so again. As such, I only neck size and smear a little Hornady Unique case lube on every 4th or 5th case.
Second, a crimp is important, but don't overdo it. Too much crimp will cause a bulge that makes chambering difficult.
Third, our firearms, especially the modern ones, aren't made of paper mache'. Your load of 7.5 grs. of Unique is well below any dangerous levels. I've shot many, many 9.0 grs. of Unique loads under a 220 gr. cast bullet and they're fine, and still below maximum according to some sources. WAY more than needed for CAS, but still safe.
Fourth, primers. When I began dabbling in CAS, one of my buddies waxed eloquently over how I needed to lighten my springs so I could run my guns faster. Not only did this limit me to Federal primers, which are eternally as scarce as hens teeth, it also lowered the lock time of my firearms to ridiculously slow speeds. So I reinstalled original springs that I slightly lightened and now I can use any primer I damn well please, and no longer wait impatiently for the hammers to fall!
Finally, there's nothing wrong at all with seating and crimping in one step. Accuracy is of paramount importance for me and I get very nice accuracy from my revolvers all the way out to 50 yds. even though I crimp and seat in one step.
CHT