Quote Originally Posted by Mr Fudd View Post

It is only a 20" barrel so may account for some of the loss but surely not 300fps!? Or is it a case of them being a little adventurous with the figures?

So this leads me on to a new question, can I go over the max load stated in the book as if I'm not getting the max velocity then I'm not creating the max pressure?
they are almost always optomistic with speeds, and yes you can go over book max charges HOWEVER you need to know what you are doing! the fact you felt the need to ask the question suggests you need to do a lot of research into the subject first.
read this inwardly digest and UNDERSTAND and then then start reading some books on reloading practises.