Grouping challenge (or who can beat shooter3)

Hi.

I propose the following challenge.

Please shoot 13 groups, 5 shots in each at the distance of 50 meters (65 shots in total). Then measure each group size. Every flier must be counted. In the end you should sum the group sizes and divide the value by the number of groups.

Here is what I was able to achieve:

The final result is 8 mm CTC. The numbers there are not CTC. You need to subtract 5.5 mm from them.

Are you able to handle that? Are you able to beat me? Let the challenge begin!

P.S. I propose this challenge because posting single groups is not fair. You may shoot a tight group once in a blue moon and you post it. Then everyone says “wooow!”. It has very little in common with a full picture.