I love the O-ring Lee die rings and I've had phenomenal use out of them for over two decades. The bonus? Laughing at folks who use a lock ring for indexing dies -- which is ludicrous. Lock rings are supposed to tighten a die in to the press. At that, the Lee rings are fantastic and they out perform the Hornady, RCBS and Lyman rings I also have a few of.
For indexing the die and having it precisely where I want it, I use an index line on the die and a matching line on the press.
Why that's been so difficult for what seems to be 95% of the folks that have ever screwed a die in to a press to discover shall be one of the great mysteries of time & space, I suppose.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.