I had a set of Optimas for a 391. They are fine chokes. Not sure which top trapshooters use them, but Anthony Matarese, Jr. does. I believe he mainly uses the 15. A friend of mine has that choke, and calls it his "Anthony Choke."
I've known Bill Davis ,the owner of Pure Gold, since he has been in the choke tube business.I shoot his chokes in my Remington's exclusively because in my opinion they the best made on the open market versus the custom tubes you pay big money for.I've made more money shooting sporting clays with my 870 PG chokes than I ever did with any others.The patterns are A-1 in these chokes.Bill started making chokes for turkey hunting and evolved into the shooting sports because he studied patterns of most chokes and found nothing was to his liking,so PureGold was born.If you look online for the site it's game acessories.com .you won't be dissapointed by their high quality and reasonable prices.