What is this yellow powder?

woodnut

Well-Known Member
Joined
May 5, 2009
Messages
1,299
Location
roanoke,va.
I was pulling bullets from some 10MM ammo and several started showing a yellowish powder residue in the cases,powder and hammer. My powder is grey! Nickle brass is new and jacketed bullets. I can only guess what it is; but I wonder if any of you have any ideas? One WAG is the force of pounding the bullets out may have caused the primer compound to break loose? Naaa , can't be that, right? But what?
 
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