The hardest bronze bore brush and the hardest lead alloy bullet are much softer than the steel used in manufacturing your revolver.
Lead alloy bullets accelerate much more easily than jacketed bullets, and the impact effects upon the bullet leaving the cartridge case, passing through the cylinder, slamming into the forcing cone of the barrel, and travelling through the bore are all much less with lead bullets than with jacketed bullets. Friction is greatly reduced with lead bullet loads compared to jacketed, and equivalent performance (velocity & energy) can be achieved at reduced pressures (overall and peak).
Leading deposits are not difficult to remove, especially when compared to the fouling left by copper-based alloys used in bullet jackets.
Your Model 14 is a high-quality revolver for sporting and target use chambered for the .38 Special cartridge, a proven performer with over a century of use. Jacketed bullets are a late arrival, something not even given much consideration for most of the years that .38 Special has built its reputation for accuracy and performance.
There is no real reason not to enjoy your revolver with lead bullet loads for regular use over your lifetime, and it will probably be ready to continue for another lifetime, given reasonable care and maintenance.