There is quite a big following for 25m BR in the UK with Sub 12fpe air guns, but not that many purpose built manufactured ones. It's far more common for people to either use stands, bipods, or a custom stock for BR, and dozens of rifles are regularly used for it from the cheap to the elite.

A few which are used for it, especially at club level are:

Daystate Red Wolf
Daystate Wolverine R
Steyr LG110
HFT500
FTP900
Walther LG400
FWB P800
TM1000
Annie 9015
Tsar/Ataman M2

Ask at a local club or join the UK benchrest club: https://www.benchrestuk.com/