Re: Barns .168 LRX
I load the 168's for my rifle and my brothers.. & they shoot really well in our barrels (however) Our barrels are 8 twist.
Those Barnes LRX are long suckers, and in my-own opinion not only require a faster than normal twist, they also (namely the 168's) are probably better suited for higher capacity casings than the ordinary Rem Mag... casings that can push 'em a little faster and harder, to reach their real potential-- and to help make up for some of the lost velocity you'll probably see with them in the ordinary rem-mag, compared to a same-weight Berger for example*
In the right barrel and matched to the "optimum" case for that bullet, it-is a wicked bullet.. definitely try them. But, you may be better off with the 145's instead of the 168's (in that particular rifle/barrel)
...and if you're set on "heavier" than that 145 LRX, give the Accubond LR's a try. Either-one of the 7mm weights of 168 or 175 should shoot through a 9.25 twist-- google Berger Twist-Rate Calculator and punch in the numbers for whichever bullets you wish to go with, whatever your given elevation is, your barrel twist etc etc.. and see what that thing computes for you. It's a pretty damn good tool to give a guy an idea which bullet will work "nicest" and (theoretically) most accurately in any particular barrel twist* Play around with that & you'll eliminate certain bullets before you ever spend a dollar on them in the store! I find it real handy.
Hope that helps,