I'm inching closer to pulling the trigger on the build project on my Sako TRG-S. My gunsmith has been wanting to get me into a polygonal rifling barrel. I don't have any experience with polygonal rifling. My perception is that the it might extend barrel life? I've read differing opinions that it might improve accuracy, but I really do not see how. Is it just a matter of preference or are there some major considerations that I am unaware of? It is a .338 Lapua if that makes any difference. I am looking at a 1/10 twist although Pac-Nor has a 1/8 barrel listed on their sight for .338 Lapua. That seems a bit fast to me.