I am soon to perform my first ever Optimum Charge Weight test.
I'd like to be able to plot bullet holes on scaled targets, and calculate group centres accurately rather than just eyeball where I think the centre is. I've seen several posts here on UKV showing the kind of thing I'm after. Results should be like this:
I have a Windows 8.1 laptop and an iPad Pro 9.7"
Free is always good, but I'd be prepared to pay a modest sum for an ideal piece of software.