Good for you Mike, I do admire people like you who keep the old ways alive, it is just not my thing.
I took your post to mean that people (not necessarily me) who coned a barrel would continue to seek out easier ways until they gravitated to a tricked-out unmentionable rifle.
My persona is a 70s, as in 1970, hunter who hacked out a B/P rifle because he watched the Daniel Boone series one too many times and had to have one. Actually, I started with a TC in the early 70s, bought an unmentionable in the mid 80s when my new wife started hunting with me, she fell asleep in her tree stand often and I wanted a safety on her rifle just in case. She quit hunting in the mid 90s so I sold the unmentionables and went back to a TC flintlock.
A close friend got terminal cancer and gave me his custom long rifle with a Roller lock and a Bill large barrel, one shot out of his rifle and all of my TC stuff was for sale.
Being a crafty guy, I decided I could build a rifle, boy, did I have a lot to learn. It took me 2 years to complete my first plank build.
Next gun; I had just taken up turkey hunting and tried to use an old Gustomsky trade gun but couldn't get it to pattern worth a hoot. I dusted off way too many turkeys without killing one. I needed a better gun so I made a jug choked English fowler turkey gun with a 38" barrel, a jug choke or 38" barrel isn't historically correct for a 1760s fowler but again I build them to hunt exclusively and build what I want.
My point is we all settle out at a different niche in this sport, some similar but none exactly the same as anyone else. I would never criticize your choice because I actually admire your dedication.
Your post really slammed anyone who would cone a barrel, which as near as I can determine, IS historically correct. I have read numerous accounts of people who own original rifles that were coned.
The guys over at the ALR site really know historical correctness to a T, go over then and ask if there are any originals that were coned, their answers will be enlightening.
I did a quick search; this is an old post from 2013, the pictures are gone but here is the text. There were also no dates attributed to the examples, most appeared to be early 19th century. One poster said he examined a number of Lancaster rifles and found quite a few of them were coned. Another poster said there were no early flintlock rifles that were coned, I guess you can pick whichever camp you want to be in. A cone like we make today with a specialized tool seemed to be rare, most were 1/4 to 1/2" long.
Here is what they said;
Redheart, I am posting some pictures with measurement of original rifles that have had the "coning" treatment. You will probably notice first that you will not see any "crown" as we are accustomed to seeing on modern made muzzle loading
barrels. This coning treatment leaves the muzzle hexagon shaped. I am sure that this treatment was done by first deepening the grooves with a round file and then following up with a flat file to "funnel" the lands. I have also seen some that appear to have had a square file used first on the grooves.
Full stock flint rifle by W.Zollman, VA The muzzle measures .437 and tapers to the .400 bore in about 1/2 inch..
Half stock percussion by J. Hayden, OH. The muzzle is .359 and tapers to the .340 bore in a little over 1/4 inch
Half stock rifle marked S. HAWKEN ST LOUIS. In this 40 caliber bore I can detect very little funneling, not even enough to get a decent measurement. I also do not see any crown which leads me to believe it had some kind of coning treatment at time of manufacture.
Doing a little more sleuthing I found that coning was called "funneling" way back when.
Here is a "funneled" Hawken barrel picture that I found.