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Periodic Revision of Handicaps. Each competitor shall be re-handicapped at the end of each calendar month, provided he shall have fired at not less than 100 birds during that period, and no fresh handicap shall be calculated for him until he shall have fired at 100 birds at least since his last handicap was framed. It shall, nevertheless, be within the discretion of handicap committees to make up a balance of 100 birds by taking previous competitions into account, should such a course under special circumstances be deemed desirable.