Originally Posted by
moondog
In light of the fact that HRPs are less restrictive than PRC visas, why would you apply for a PRC visa?
Perhaps OP wants US consular access but then that begs the question why OP applied for HRP to begin with.
To answer OP's question about losing HKSAR passport, I believe you have to formally renounce Chinese nationality with HKSAR in order to lose it.