Newby Question, Hogue finger groove grips?

Just starting out in Bullseye. I wonder if the Hogue rubber type finger groove grips are legal and if so, why I haven't seen any mention of them.
Is there something wrong with using them for Bullseye?

They are perfectly legal for Bullseye competition. They are legal for Distinguished revolver as well.

Not for service pistol though if I understand correctly.

I use to use Hogue finger groove grips on my Gold Cup. Nice grips. I did however move on to Herrett Nationals on most of my pistols. I like the supported palm shelve feel. And my scores creeped up a little. The Hogues are stored away somewhere.

Len