RE: 3d shoot
The 3d is great practice...
I have shot some that allow for use of binos / range finders. Some that do not.
They are a ton of fun though...
I prefer to do them w/out the use of binos & range finders... I try not to get caught up on score, but I have to admit I do get pretty competitive... with myself mostly.
I like the practice for deer season. That is ultimately why I shoot them.