My advice is to sell the XR100 outright for just as much as you can get and go find a junkyard/pawnshop 700 in .308/30-06 (.473) boltface........ 22-250, .243, .260Rem, 6MM, .270 etc.... Don't even WORRY about model, just go for CHEAP. Now you've got something to work with AND hopefully some money in hand. Target 250 bucks for the "junk 700." Even if the finish is buggered, don't sweat it, value the savings.
These are easy to find stocks and parts for, go with McMillan or other BENCHREST stock if you want a painted piece. Absolutely do not buy one of the wannabe's like Choate or even HS Precision.......Next bestest (maybe even BETTER??) would be something like the Shehane Tracker series, build this rifle as a long-range varminter to be used also in 600-1000yd comp so's you can forget about the weight issues.
Trying to make a competitive 100-200yd rifle would be a huge mistake IMO (altho I AM currently building a 10lb HBR rifle from a 700 platform. Believe me though, I'm doing it for purity's sake NOT to save money!
)
Build your own 6BR, save your pennies so's you can get two barrels. Get a 14twist and an 8 twist both done with the identical .060 freebore 6BR reamer and learn how to feed them and you'll have a rifle to grow old with. You can easily make it shoot a quarter inch, REALLY agg a quarter, at least with the 14twister. Reloading dies will be a HUGE part of this...... the dies are a big part of the equation all the way around. You can have a $3000.00 stick but without truly fitted dies it will NEVER SHOOT.
Now when I say "build your own" I mean stuff like pillar bedding and finishing your own stock, assembling and timing the trigger and weighting/balancing the rig. Bedding/fitting/aligning your scope bases and rings.... the nit-picky stuff. Have someone else do the barrel fitting and action work. PERIOD. You can get your stock now and play with fitting and finishing it, remember to allow for a huge BR barrel when you inlet the barrel channel. It'll look a little weird for a while but who cares.
Above all ask lots of questions from the right people and enjoy the journey. If you aren't good with your hands and really do want a turnkey piece than just sell what you've got and buy a used BR rifle, custom action.
Here are some BR stock choices.
http://www.bordenrifles.com/
http://www.scopeusout.com/ (I REALLY like these for home projects...)
http://www.kelbly.com/
http://mcmfamily.com/
http://www.rifle-stocks.com/
And lastly a link to Bruno's McMillan page in case you find a McMillan you like, Lester might have it......
http://www.brunoshooters.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=BSS&Category_Code=40
If you get lucky you MAY actually end up with a competitive 600-1000yd rifle for not too much more than out and out buying one. With a lot of your own trial and error.
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