In this video, I successfully tested shooting AVS Slugs out of the ATI Nova Liberty at 100 Yards under an Inch. 10 shot groups were just over an inch but very tight. I will be offering these slugs on Ebay under the name AVS slugs.

The length is each slug is
22 grain = 7.71mm
23.2 grain =7.96mm
24.2 grain = 8.26mm
26.1 grain = 8.65mm
As a comparison to the length of JSB 18.1grain = 7.78mm and H&N Baracuda match = 8.69mm