Plucked up courage to put a competition sticker on my first 20 yard benchrest card on Friday and managed a 181.
Plenty of useful tips from the guys at the club like 'don't clean the barrel', so I stopped doing it and its settled down, I've actualy found what appears to be a sweet spot at just over 160.
I've tried various pellets including Weihrauch (which look very pretty) and Webley but AA 452 Diablos seem to suit best.
also try the premier, i run them through mine and my groupings are pretty great in the tunnel range