The best for 3-Gun / IPSC Rifle right now, my personal opinion ( backed up with what the top is using at least on this side of the pond )
1-6x, Swarovski Z6i or Kahles K16i
1-8x Swarovski Z8i
Steiner is coming out with a new 1-8x, took a look during Enforce Tac expo in Germany, this one had FFP reticle with a dot far too big for sporting use.
However, it is quite likely it will be available in SFP. Looking at it otherwise, if it has a good SFP reticle, it will be a serious contender.