Re: barrel question
First of all, I don't consider a 110gr bullet to be a reasonable choice for a .308 chambering. I've used it with good success in 7.62x39, and think it has some utility in a .30-30, but as the case capacity grows, its utility appeals less and less to me.
As above, 1:10" twist is good for the other bullet weights you mention, and somewhat heavier yet. It is pretty much the more common twist available for .308, and for good reason.
I wouldn't fault an L-W barrel for having difficulties handling 110gr bullets with a 1:10" twist. It's a matter of asking the barrel to do something rather a bit outside its optimal design intent.
I will gladly recommend L-W barrels as quality implements. You get what you ask for with L-W, be sure you ask for the right thing.
The most prevalent origin for barrel failures is throat degradation. It's way ahead of all other causes combined. It occurs when heat/cool cycles exceed extremes of temperature and repetition. The more rapidly the the rifle is fired, the faster the rate of degradation, so barrel failure is at least as much a matter of usage as it is of manufacture.
I consider the LW-50 stainless barrel material to be significantly more resistant to throat degradation than other barrel materials. It can also be somewhat problematic for inexperienced gunsmiths to perform the needed metalwork associated with chambering, crowning, and threading; but L-W will gladly explain the necessary approach to any gunsmith. In other respects, the L-W products are not unlike other barrels, and I consider their workmanship to be on the same level with works of art.
Poly(gonal) rifling is not especially common, and I think it's interesting. I believe there are implications involving ease of cleaning and perhaps involving improved throat life. I would love to be in a position to find out; but it appears you've beaten me to it. <span style="font-style: italic">Please</span> keep us informed of your barrel's performance and behavior.
Greg
