I have a inline that takes the .209 primer. CVA Optima magnum in .45 with a 3-9 scope. Three pellets of triple-seven which is 150grains and shoot either powerbelts or sabots.
I've shot the Traditions Kentucky percussion, my brother-in-law has one.
Don't remember how many grains of loose powder he was using, either 70 or 90? And a patched round ball.
With it's iron sights we were hitting a hundred yard target just as accurately with the traditional sidelock as we were the inline with scope.
The inline is easier to clean and they cost less but are kinda expensive to shoot if you compare sabot and pellets to loose powder and ball.
Would love to get a traditional sometime, and think I'll go with a flintlock.
Always liked the looks of the Lyman Great Plains rifle.
Leaning towards a Traditions Mountain rifle now though, cheaper and I like the looks of the barrel. It has a brown 'CeraKote Finish' which replicates what the rifle would have looked like during the time period while providing increased corrosion resistance.