If you are still looking, your lack of response suggests you may have found another source.
None the less - of the 17 F Berry Soldiers found only one was a sergeant.
Name: BERRY, F
6th Battalion The Duke Of Cambridge's Own (Middlesex Regiment)
The 6th Battalion was a part time Militia battalion of the regiment and was formerly known as the 1st, or Royal East Middlesex Regiment of Militia
His Militia Attestation papers are available on Findmypast
No 4307 Frederick Berry bc 1854; Parish Hoxton, London, Middlesex.
Last name: BERRY
Attested into 4th Battalion Middlesex Regiment aged 34 yrs 6mths 7 Nov 1888.
Served from 1888 until November 1900 discharged as sergeant.
Papers states he had previously served for 12 years with the ? Dragoon Guards (year of discharge masked by paper fold).
The National Archives reference: WO96