Greetings, All,
I found that the original Uncle Mike's boot grips allow the use of an HKS speedloader, with no problems, at all. However, the version of that same grip, that S&W is using now, does NOT allow using it with the same speedloader! Hummm..... That grip has been changed "just enough" so that it no longer functions with speedloaders. Why? I have NO idea! But, I'd already had a set of the original Uncle Mike's boot grips on my old M60 .38, and when I found that the new version of that same grip did not allow using speedloaders, I found another set of the old Uncle Mike's grips, and replaced the ones that came with my 642. Works like a champ now, with easy use of the HKS speedloaders!! Seems odd to me, but that's what worked for me.
As to the Bantam grips they do not work as well for me, as the original Uncle Mike's, so I'll stick to what I have. But, I have friends who swear by the Hogue Bantams, and so if they work for you, I'd say to go for it. For what it's worth.... Take care, and God Bless!
Every Good Wish,
Doc