rolling, Three shots in a minute...that is impressive! I think I am likely more in the three minutes per shot range. :-) How do you measure your powder in that speed loading process? My main focus is hunting and I do not get in that big a hurry really. I use an over powder cushing wad to protect my patch so I have an extra step anyway, an extra run of the ramrod down the barrel. I am likely too meticulous but I am an accuracy freak and I know what it takes to make my gun stroke on out to 100 yards. You likely have yours stroking even at that speed but I am a long way from there yet. I use my speed loader to get ready for a follow up shot hunting and then take my time getting the speed loader ready for when I need it again.
Mark,... I use a deer antler 90 gr. powder measure for my main charge.
I carry the measure "loose" in my shooting bag, along with loose roundballs.
My canvas haversack contains everything else I need for my rifle, such as cleaning tools, spare caps and flints, extra ticking, and etc.,... and I wear it on the opposite side of my shooting bag and horn.
I've only been shooting my smoothies for a few years, so I am MUCH slower loading/reloading "shot" loads, compared to roundball loads.
I've found that loading muzzleloaders is pretty much like any other "craft" (done by hand),... the more ya do it, the faster and more proficent, ya git at it.
YMMV