Most "holster wear" is a result of fine grit inside the holster, not the leather itself. This collects over time from environmental dust and debris, think about how dust collects on surfaces in your house, car, etc. It becomes imbedded in the surface of the leather. All you can really do is try to keep the holster as clean as possible and make sure it fits the gun snugly to minimize movement of the gun in the holster during normal wearing.

Whether a holster is lined or not, or what lining material is used makes absolutely no difference.

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Gunsmithing since 1961