And you can shove them (or 454s) in with most speedloaders made for six-shot .44Mag N-Frame S&Ws. The only ones that might not work are the Maxfire rubber jobbies. The HKS twist-release types definately work, probably the Safariland push-to-release types too if you can find 'em.
It works because while the .45LC/454 shells are fatter than a .44Mag, the outer rim width is pretty much identical. .45LC rims are on the small side.