POWER OF ATTORNEY


(Section 16(a) Reporting)

KNOW ALL MEN BY THESE PRESENTS, that the undersigned, an
officer, director or affiliate of Precision Castparts Corp. (the "Company"),
does hereby constitute and appoint Shawn R. Hagel, Russell Pattee,
Steven C. Blackmore, Ruth A. Beyer, Jason A. Dalton and Joanne E.
Laferty, and any one of them, his or her true and lawful attorney and
agent to execute in his or her name any and all reports required to be
filed under Section 16(a) of the Securities Exchange Act of 1934 with
respect to equity securities of the Company; and to file the same with
Securities and Exchange Commission and any applicable stock
exchange and take actions that may be necessary or desirable in
connection with such filings; and the undersigned does hereby ratify
and confirm all that said attorneys and agents, or any of them, shall do
or cause to be done by virtue hereof.

This Power of Attorney revokes all prior Powers of Attorney
relating to reporting under Section 16(a) and shall remain in effect until
revoked by a subsequently filed instrument.

Dated:  November 13, 2013

/s/ Andrew Masterman

Andrew Masterman