I am interested in this topic. Over the last couple years I have tried to either purchase or build a rest for such a purpose. I'll email you a picture of what I have tried as a support for the rear of the stock when such a tripod rest is used. It is made of a lightened photo tripod with a small "V" shaped rest cannibalized from a Stoney Point thingy.
I also bought one of Hart's "Ultimate Tripod's". Very high quality but heavy at 14 pounds. I lightened it some by changing to a surveyor's aluminum tripod.
I also built a simple yoke to atttach to a high quality $250 Arca Swiss photo ballhead and a Leonard Rue Groofwin. This I have used from my 25 foot-high whitetail stand with its plywood shooting bench surface. Since then I have switched to sand bags, front and rear. Shot my doe at 513 yards last fall from there with the bag setup.
Dave King has encouraged me to find ways in the field to somehow get down into prone-Harris position so I have shifted my focus somewhat since my attempts to find the ultimate sitting-position field rest.
This week I am shooting my newly remodeled rifle, 7 Dakota
, from prone-Harris. I put a new carbon barrel on it from Christensen Arms and had John Geiges then accurize it including a new McMillan stock. I find I can hold almost my own personal benchrest numbers in vertical group size this way. About 1/2 moa or so, vertical, out to 800 yards. I use a sand sock as he suggested.
Do you have a pix of Nightforce's model?
[ 07-11-2001: Message edited by: Len Backus ]