That's good advice, thank you - as you say at 25yds enough shot in the pattern makes good sense.
What about the case type though - a lot of the loads on the web specify case manufacturers eg. Cheddite - but if it all fits in can you ignore the case make.
Also thank you for the info on the 303 brass - its something I will look into in the future, as it looks good fun - but I'm going to stick to plastic cases until I have a bit more experience under my belt.
Cheers