>>64496600
Yes, loading a rifled musket before Minié Balls was cumbersome, which is why they primarily remained a sporting weapon for most of the time, while roundballs from a smoothbore were accurate enough to probably hit a man most of the time within 100yds.
The ease of loading and rate of fire was widely considered much more important by all militaries all around the world until the Minié Ball finally gave you the best of both worlds. Fast loading, and fine precision out to long ranges.