Ace I use the crossno 22 liner in the wifes 40-65 rolling block. Great little item to have around, good for practice, and also would come in handy at a shoot where they offer 22 matches as well.
Google up Crossno's gunstocks and call and order direct from Dave hisself, same money as going thru Buffalo Arms, and probably a bunch quicker, as it'll be shipped direct to you, instead of to Baco and then on to you.
Have heard some good things about the Shaver inserts, but have no actual experience with them.
Ron Long used to build them to your guns specs, but not sure if he's doing it any more or not.
Bottom line yes get a hold of one, great little items, and I doubt they'ld hurt a quality barrel.