I do all my shooting & hunting with Flintlocks year round but I'm not a purist and I use TC 4-N-1 quick loaders in .45/.50/.54/.58cals,
arguably the best pocket reloaders available because of their built-in short starter.
I don't think of them as "speedloaders" but simply as a convenient way to carry a few reloads in the pocket of a hunting shirt.
A deer is either down within sight and no "quick reload" is necessary, or they've bolted 25-35yds and crashed just out of sight
making a quick second shot impossible anyway.
After a shot, I take my time, spending several minutes thoroughly cleaning, drying, lubing the bore with cleaning kits carried
for that purpose, followed by the frizzen, vent, flint, and pan.....then I quietly reload the rifle and go fetch the deer...and if it's still
very early in the hunt, I'll drag him back to my stand, sit back down and continue hunting with a fresh load in a clean rifle.