Accuracy isn't the issue, it's speed in the rapid fire part of the match. You can learn to cock the revolver fast enough to become a good shot, but in the long run you'll do better with an auto. The best advice I can give you-- because I learned this the hard way in bullseye-- is to find out what is commonly in use in bullseye matches and use that.
At the low end, this means a Buckmark Bullseye or Ruger Government auto with a trigger job and a red dot scope.
Bullseye is a great game that you can play for a long time, so I encourage you to get equipment you will be happy with.
I have a 617 revolver and a 38 revolver, and both are very accurate. But I do not use them any more in bullseye, favoring the autos instead.