I would love to have a go at 100-150 yards on an indoor range (never seen one that long though). Maybe someone on here has access to a big warehouse and could organise something. I bet you could get some very decent groups indoors.
I shoot @ 100 yards with my springer as that's all my backyard will allow...
Here's a video:
http://www.youtube.com/watch?v=SA-1X3jGi1M
I'd like to take a crack at sumthin further (perhaps 140-150), but I'll have to shoot from the front yard and risk having my neighbors freak