I have 2 semi customs that started life as Sendero's, one in 300WinMag and the other is in 264WinMag, neither are braked and both weigh almost 12.5 lbs. The HS Precision stocks are a good platform and a skim bed really makes them shine.
I liked the Sendero so much that I also got a VSSFII in 22-250 which I made into a semi custom by having it turned into a switch barrel, I have 22-250AI and 260Rem barrels so far and it is a tack driver with all 3 barrels, including the original factory barrel.
These rifles are well worth the money as a good platform for your long range aspirations, the best thing you can do is swap out the factory trigger for a Jewel and never look back.
Good luck with your choice.