Shooting Mask

One of the learned gentlemen noted that he's taken to using a mask when shooting at the SMSC indoor range due to the lead residue from the primers.  He indicated that a 3M 7500 with filter 2097 P100 is most suitable for minimizing lead absorption, the latter being the chief reason that I no longer attend the indoor sessions.  Supposedly the 8233 N100 filters also cover lead exposure, but the lack of a tight seal around the mask makes this a less desirable solution.