Sinclair Catalog www.sinclairintl.com
has book on Precision reloading Volume 10 for $13
and Precision shooting at 1000 yards. buy both and that will do it.
As for forums for guns with classifieds forums that have lot of LR guns for sale. also go to BR central, look at menu on left click on "complete rifles", then popup will come up on right with names and go down to "Shooters Corner", click on that, when page comes up go to top of page and click on "the list". that is a 30 page list of BR guns, BR equipment, scopes and stuff from Bob White past pres of IBS in NJ. He is 120% accurate on his guns and you can rely on the info he says. He is noted for being totally honest on guns and what he sells. That list is not always current so email or call him and he will tell you exactly what he has in stock now.
Best bet is to go to the 1000 yard matches in NC at HawksRidge just west of N. Wilkesboro and see the guns for sale and look at people are shooting. Dave Tooley, Leonard Baity, Bill Shehane are all big smiths and shooters that will be there. the nc website is www.nc1000ydshooters.com
their last match is real soon so look at it.