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Muzzleloaders are different. Because blackpowder develops much less pressure than smokeless, the bullet has to be much softer in order to obturate up into the rifling. So all bullets for muzzleloaders should be cast dead soft - 100% lead and no alloys.
The situation with roundballs is almost an exception because the shooter can use extra-thick patches to take up the difference between the ball and bore diameters. Roundballs don't necessarily obturate at all. That's why hobbles can get good results with an alloyed ball.
But several centuries of experience show that hard lead alloys make miserable bullets (by which we mean pointed projectiles, not spherical) for muzzleloaders.
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