I recently had the opportunity to shoot 3 bolt action BMG's (well, 2 TRUE bolts, and a shell holder..), with 3 diferent types of ammo. I shot at 200 yards for the range work, and various ranges in the field kiling rockchucks.
The guns were a State Arms Rebel (full length bbl, wood stock), an AR50, and a Serbu BFG-50.
The full results will be a segment in our next video, www.dogbegoneandbeyond.com
But in a nutshell, they ranked like this:
Accuracy:
Best- State Arms********Worst- AR50
Trigger:
Best- State Arms********Worst- AR50 (though the Serbu was not better by very much at all...)
Function:
All guns functioned well, with 2 failures to fire coming from the Serbu.
We ranked a few more categories, but that's the gist of it.
Bottom line should be determined by your intended use. Of all the test guns, I chose to keep the Serbu. This was 90% determined by the fact that at 22#, it makes the most sense of the 3 for field use.
If I had intended this to be strictly a bench gun, the State Arms would have gotten the nod hands down.
Of course, there are other great choices out there from AMAC, Barrett, et al. But I have no hands on experience with them.
Hope this helps