I use the spent brass with the primer replaced with Goop. This material is very strong and will out last fillers such as silicone caulk. I never tried silicone gasket material. You need to clean and fill the primer pocket so the material is a little high, if it dries too high you can always trim it with a razor blade. I find this to be a good use of brass with loose primer pockets or other flaws that make them good candidates for the recycling bucket.
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Revolver luvin' Mountaineer
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