Fwb 300
The 300s is as accurate as the modern match rifles as makes little difference, and there is a lot of tolerance on a bell target. The modern PCP is a lot better, but the big advantages are on ballance, general ergonomics, faster lock time, and recoil characteristics. A good well fitting modern jacket will help your stability, but only if your technique is good, improving your technique will make the real difference.
Good Shooting
Walther KK500 Alutec expert special - Barnard .223 "wilde" in a Walther KK500 Alutec stock, mmm...tasty!! - Keppeler 6 mmBR with Walther grip and wood! I may be a Walther-phile?