Moose Moulds sells a similar "collar button" bullet. I believe it was originally intended for 45-70? Anyway it's my go-to bullet for N-SSA revolver competition.
It's not listed on their web site but this is what it looks like:
View attachment 180588
I don't see any benefit to cutting the base into a "clover leaf" design. As is, the bullet base is "heeled", in that it fits down into the chamber. there may be some compressive effect when the bullet enters the barrel, with the back end acting like a piston, causing the bullet to collapse on itself and take up the rifling on both the front and rear bands.
I do not lube this bullet as in N-SSA competition we have to use over-ball lube anyway.
Steve