I saw this and thought of you:

http://www.ontargetshooting.com/download.html

It is a handy bit of software for measuring groups. You just take a picture of the target and load it into the software. You can define a known fixed distance for reference (my targets have 1 inch lines on them) and then mark the bullet holes and point of aim and this produces some stats for you.

The handy thing is that you can save the results with information about load data. I suspect that this "archive" feature will be the most useful as you can keep track on load development as you go along. For those just shooting the occasional group to make sure everything is still on zero I don't think this has much application.

Thanks for that Caorach, I have a full file of targets going back many years, think this will/might be handy to reduce shooting clutter!!

Think I should wait for a wet day to do it though!

Cheers