Berkshire had three players making their Unicorns Championship debuts - Finchampstead allrounder Adam Dewes, Ealing paceman Alexander (better known as Mungo) Russell and Datchet's young bowler Jarryd Wallace.
Both Dewes and Russell are Durham University students.
Russell (pictured) received a late call-up after Berkshire's registration for Sunbury seamer Ishwarjot Sohi had been rejected with the ECB claiming the Indian-born player with a British Passport had not spent enough time in this country during the last four years, though this was largely due to the fact he played in Australia and New Zealand for the past two winters.
With Berkshire skipper James Morris winning the toss, Dewes opened the innings with Waqas Hussain and was bowled by Henley's Tahir Afridi for 11.
Hussain went on to make 53 off 76 balls, Andy Rishton scored 13, James Morris 4 and Dan Lincoln 29, leaving Berks 139-5 in the 43rd over.
But the lower order came good with Joe Thomas making 35, Chris Peploe 21, Stewart Davison 63 (off 107 balls) and Russell 42 off exactly 100. Davison and Russell put on an invaluable 95 in 31 overs for the eighth wicket.
Raja was bowled by Afridi (3-50 off 22.3 overs) for a duck, leaving Wallace 8 not out. Berkshire were all out for 296 with three balls of their 90 overs remaining.
Wiltshire moved on to 43 in 13 overs before Russell found the edge of Jake Goodwin's bat and saw him snapped by Davison. He made 16. And it was a similar dismissal that brought about the departure of fellow opener Will Wade, out for 26 with the total on 44.
By the close of play, the hosts had moved on to 87-2 from 24 overs with Neil Clark unbeaten on 26 and Uzair Qureshi still there on 17.
Bowling: Russell 2-39 off 9 overs, Rishton 0-22 (6), Peploe 0-8 (6) and Wallace 0-18 (3).
Updated 19:16 - 8 Jul 2018 by Dave Wright