Most of the quality PCP,s used for FT and HFT can give good results off the bench with the best dome headed pellets such as JSB/AA 8.4 and 7.9 gr
At L&D the majority of rifles used are AA models AA Classic/MPR/HFT500/EV2/FTP 900.
A regulated rifle takes away the shot number /power curve anxiety problem but puts costs up slightly
The 10 metre target rifles do not perform well at 20 and 25 yds. You need the higher power of a FT type air rifle
The scope should ideally be high fixed mag with very fine cross hair(with or without target dot)
The Weaver T 36 or Sightron are ideal
Falcon 35 x is also a good choice
Go for 1/8 MOA adjustments
I have emailed you an entry and the rules for the Midlands Summer benchrest postal which starts in April
Rgds
John