OBs scored seven tries on their way to a comprehensive win over Somerset Premier side Chew Valley.
Chew Valley converted a penalty shortly after kick off but this proved to be their only points of the match.
OBs scored four first half tries through James Pritchard, Dan Evans, with Steve Forster scoring twice. Jack Price adding two conversions and a penalty.
Three injuries during the second half meant some minor reshuffling, but Jonny Biggins, Lyndon Davies and Rhys Jones all scored tries, with Jack Price again kicking two conversions and one penalty.
OBs will now face Broad Plain in the next round of the Charles Saunders Foods Bristol Combination Cup.
OBs play St Mary’s Old Boys this coming Saturday in the first round of the RFU Senior Vase.