Re: Lothar Walther Alum Sleeved Ultra Light or ABS Carbon Fiber?
Have had a few CF wrapped rimfire barrels, they were about 3x the cost of stainless and 2x the cost of the aluminum sleeved barrels. But they have shot great, the 1 aluminum sleeved barrel I had shot ok, but for the most part I think the liner was more to blame than the sleeve. (in high speed ground squirrel shooting the barrel would heat up and have a wandering poi like you wouldn't believe)
I don't have any experience with the LW barrels, only could find mfg literature and one article by accurate shooter. But after watching aluminum interact with stainless, and stainless interact with composites in harsh environments I'd go composite.
Seems to me at the end of the day the quality of the blank would be a deciding factor, is 100$ more worth it to have a rock cut rifled barrel? The big hang up for abs for a lot of guys was the lead time, but now that it is proof research and not abs maybe that issue has cleared up.
Looking to build a similar setup to what you described this fall, just about over half way through the saving process for the components, and I'll be going proof research or a light taper Lilja.