I've entered - what's the worst that can happen? (I get found a crumpled, broken mess in a ditch near Oundle, probaby).
I'm pretty sure this is where you refer back to the old Audax saying - "if you can ride 200km then anything over that is psychological" - basically, if you want to ride 300km and have a base level of fitness then you'll be fine. Make sure you eat well at the controls, and don't waste too much time at controls though. 300km is a good distance for Audax, the perfect sun up till sun down full days riding.
I'm pretty sure this is where you refer back to the old Audax saying - "if you can ride 200km then anything over that is psychological" - basically, if you want to ride 300km and have a base level of fitness then you'll be fine. Make sure you eat well at the controls, and don't waste too much time at controls though. 300km is a good distance for Audax, the perfect sun up till sun down full days riding.