I'll be different & say Ultradot. :-)
I've put thousands of rounds through my 30mm Ultradot 4 on multiple guns over the last 12+ yrs. Most were from a mod 29 with an unhealthy steady diet of 320s @ 1340fps. Many were through a Marlin Guide gun in 450 shooting 420s @ around 1900fps. For the last few yrs it's been hundreds (close to 1k?) through a 7.5" Ruger SRH in 475 Ruger with 400s in the 1200fps range. All in Alaska, much in inclement weather, abused in handeling getting in & out of trucks & boats, hit the ground a few times, & never a hiccup. It's in Warne QR rings.
Yeah, I like it!