| Inns | HS |
| 291-8 | 82 | Downside Wanderers v Old Tonbridgians | Downside School, Stratton-on-the-Fosse | 1989 |
| 273-7 | 60 | Downside Wanderers v Old Westminsters | Vincent Square, Westminster | 1978 |
| 272-9 | 77 | Downside Wanderers v Haileybury Hermits | Downside School, Stratton-on-the-Fosse | 2010 |
| 264-6 | 77 | Downside Wanderers v Old Whitgiftians | Whitgift School, Croydon | 1988 |
| 248-9 | 69 | Downside Wanderers v Old Wellingtonians | Wellington College, Crowthorne | 2001 |
| 248-7 | 70 | Downside Wanderers v Shrewsbury Saracens | Downside School, Stratton-on-the-Fosse | 2008 |
| 234-9 | 84 | Downside Wanderers v Rugby Meteors | Rugby School Ground, Rugby | 2009 |
| 233-7 | 54 | Downside Wanderers v Old Westminsters | Downside School, Stratton-on-the-Fosse | 1982 |
| 230-5 | 82* | Downside Wanderers v Marlborough Blues | Marlborough College Ground, Marlborough | 1986 |
| 229-6 | 84 | Downside Wanderers v St Edward's Martyrs | St Edward's School Ground, Oxford | 1978 |
| 228 | 66 | Downside Wanderers v Old Malvernians | Vincent Square, Westminster | 1986 |
| 223-5 | 76 | Downside Wanderers v Marlborough Blues | Downside School, Stratton-on-the-Fosse | 1984 |
| 218-9 | 59 | Downside Wanderers v Old Whitgiftians | Downside School, Stratton-on-the-Fosse | 2015 |
| 213 | 88 | Downside Wanderers v Rugby Meteors | Rugby School Ground, Rugby | 1984 |
| 213 | 37 | Downside Wanderers v Marlborough Blues | Marlborough College Ground, Marlborough | 2025 |
| 212-9 | 58 | Downside Wanderers v Old Westminsters | Downside School, Stratton-on-the-Fosse | 1970 |
| 210-8 | 70 | Downside Wanderers v Old Whitgiftians | Downside School, Stratton-on-the-Fosse | 1979 |
| 205-9 | 56 | Downside Wanderers v Lancing Rovers | Lancing College Ground, Lancing | 1986 |
| 201-1 | 96 | Downside Wanderers v Radley Rangers | Downside School, Stratton-on-the-Fosse | 1984 |
| 200-8 | 37 | Downside Wanderers v Old Malvernians | Malvern College Ground, Malvern | 1984 |
| 199-3 | 74 | Downside Wanderers v Sherborne Pilgrims | Sherborne School, Sherborne | 1986 |
| 196-7 | 49 | Downside Wanderers v Old Brightonians | Brighton College Ground, Brighton | 1977 |
| 195-3 | 57* | Downside Wanderers v Old Westminsters | Downside School, Stratton-on-the-Fosse | 1995 |
| 191-9 | 52 | Downside Wanderers v Old Brightonians | Downside School, Stratton-on-the-Fosse | 1995 |
| 189 | 46 | Downside Wanderers v Bradfield Waifs | Downside School, Stratton-on-the-Fosse | 1997 |
| 189-6 | 62* | Downside Wanderers v Old Westminsters | Vincent Square, Westminster | 2002 |
| 179-9 | 42 | Downside Wanderers v Bradfield Waifs | Downside School, Stratton-on-the-Fosse | 1994 |
| 173-8 | 64 | Downside Wanderers v Radley Rangers | Radley College Bigside Ground, Abingdon | 1999 |
| 170-9 | 44 | Downside Wanderers v Old Cholmeleians | Highgate School Ground, Highgate | 1980 |
| 167 | 46 | Downside Wanderers v Old Alleynians | Dulwich College Ground, Dulwich | 1985 |
