In the book HOW published by the NMLRA, Lou Cowher in his chapter on freshing or recutting
a barrel said.
Walter Grote tells about being awakened by hearing William (Billy) Yonker, Shartlesville,Pa.,
freshing out his ml rifle,early one Sunday morning before the shooting match. Billy Yonker holds
the record of sixteen consecutive tens at 100 yards,bench rest using a flint lock.
Even if Cowher spelled Yonker with out a (u) I would bet William (billy) Yonker and W.N. Younker
are the same person.
Rickard Henderson