My first muzzleloading rifle was a Kentuckian flintlock. I bought it back in 1972 or thereabouts.
Mine was a .44 caliber rather than the more common .45 made by other companies. It shot a .433 diameter patched roundball.
I hunted with it and got one Javelina that went down like a fright train had hit him. Of course, the shot hit him in the spine so that might explain why it fell so rapidly.
The flintlock always produced a good shower of sparks that lit the prime but sometimes the main powder charge took maybe 1/2 second to fire. It seemed to have the old, "Click.Poof, Whoooosh, Bang" syndrome.
Later in life when I started building flintlocks and installing vent liners with an internal cone I noticed they always fired almost instantaneously so I looked at my Kentuckian. It just had a small vent hole going thru the barrel wall. I attributed the slow fuse-like firing to this.
By that time, I no longer shot the Kentuckian so I didn't bother to try to install a vent liner and sold the gun at a local gun show.
I ran into the buyer about a year later and asked him, "So tell me. How does that Kentuckian shoot?"
He looked at me and made a grumbling noise and said, "I don't know. My wire thinks it's so pretty she claimed it when I got home and hung it on the wall. She won't let me shoot it."