Nope. 5R means 5 groove Russian pattern. It is the old "trough shaped" rifling of the late 19th century brought back for the AK74 (with 4 grooves) and commercialized in the USA by Boots Obermeyer and now others. Broughton and some others call it "canted" rifling.
It is supposed to engrave the bullet more smoothly, wear longer, etc., etc.
I think it has more to do with the quality of manufacture than the shape of the grooves.
The twist rate determines the length of bullet that will be stabilized.
Bartlein T Style is the main gain twist rifling that I know of. They will make any twist and any gain factor you care to order. I don't see where they say what profile land and groove they make, though.