The Biz plates I got off Mucko are Biz 400 and are 15mm and 20 mm thick. So far we have shot them out to 700 yards with a 300 Win Mag and 300 Rum , 7mm Mag , 30 06 , 260 and 7mm 08. No problems other than if you hit the edge you take small chip out, hits square on plates are fine. If you are going to shoot further out they will work well. Talk to Mucko as he still has some round 20 mm plates at 7 and 9 inch dia.
When my gong was made the plates that came with it were Biz 80 and the 300 win, 270 , and 260 were leaving pretty big dents out to 500 yards.
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