I have a laser rangefinder also, and will shoot the distances around my stand or blind a number of times to memorize them. If nothing is going on instead of glassing I often reshoot the distances to test my memory of what they are. Passes the time some while waiting for something to happen.
Arthur,
Since I'm one of those speed freeks you warmly refer to

, its really not that bad getting things tuned at a little over 300fps. As in all setups you need the proper arrows. I just setup another new dozen arrows and tuned them for broadheads. 10 of the arrows made the cut grouping in a 1.5" circle at 20yds, the other 2 arrows are getting "culled" and will not tune. The arrows are supposed to be all the same spine, but obviously not, they would not index and come in. I will put a fieldpoint on them and see what happens, they may survive for that purpose, otherwise they're stump shooters.
Aim Hard!