A cylinder with a little play that will self align with the right boolit will never wear. You can get some sandblasting from powder at the edges of the cone but it does little harm. This is a SBH with over 61,000 heavy loads with 296. You can see the rough edges yet the gun can still do 1" or under at 50 yards and 1-1/4" at 100. The groove to groove is still .430".
Powders like Lil Gun can ruin a cone fast as can fast powders that reach max pressure in the cylinder. You can even split a cone.
If you see damage fast, the gun is wrong or you need to change what you are loading.