Kind of lame, bricks are too easy to shatter. How about shooting some steel? How much steel it takes to stop the slug? 2mm 4mm? Have punch a hole to 8mm steel at 50m with airgun. Special slugs. Marko
Do you have Labradar or similar system to measure how much there is energy left at 100 or 150m? You shoot crono so you can calculate muzzle energy but how much drop is when bullets reach those distances... Just wondering..
I find it hard to believe you get any kind of usable groups at 150 meters. Your 65 yd groups look to be around 3". At that distance should be a ragged hole.