I've heard that pellets can be used with flintlocks, if you first toss a very small charge, say 5 gr. or so, of triple f or 4f black down the bore. Don't know if that's more trouble than it's worth, but I heard it can be done. Worth a try I guess.

I don't use pellets at all. They don't seem any easier to me. If I needed a quick follow up shot, and was in a real hurry to load, I'd rather spill a couple grains of loose powder than drop a whole pellet.