Corrosive Mil-surplus ammo and Mercury

[Bullseye22]

Since my son and I started our small collection of old mil-surplus rifles, I have done a lot of research on the use of corrosive surplus ammo. Since we have a Mosin Nagant 91/30, and a Chinese T-53 carbine, we have been shooting mostly Russian and Bulgarian spam can ammo. Recently with the acquisition of a Spanish M43 Mauser, we have been using some surplus Turkish ammo. We are very diligent in flushing the barrels out at the range with a mixture of Windex and Water (using an enema bottle) and giving them a full breakdown and cleaning when we get home. So far, no problems and no rust. But during a visit to the LGS yesterday, the owner advised that we should not be worried about the salt in the corrosive primer, but the Mercury. Most, if not all that I have read about cleaning firearms after using corrosive ammo has dealt with getting the salt our of the bore and off the bolt and other parts of the rifle. So have I missed something? Do I need to be worried about Mercury in the primer, especially in 1970-1980's Russian/Bulgarian surplus ammo?

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