Silver bear has a zinc coating, no lacquer, and is steel so it is harder than brass. The only problem with steel cased ammo is it does not expand and form to the chamber as well as brass, so your chamber gets dirty fast, which leads to a FTE with a case stuck in the chamber. This is why people complain of this problem with all of the steel cased ammo that is not lacquer coated, such as newer wolf and a few others that are polymer or coated with other materials than lacquer. It also may chew up your extractor faster than brass, but that is a cheap part. I really don't think it would hurt a chamber, since it does not expand as much as brass. BUT, if I had a match rifle I would not shoot it through it. I'v shot a lot of steel cased ammo through my ARs and only have had problems if I let my chambers get too dirty., If I take 500 rounds, I would have to clean it half way through to keep everything smooth.
