Shot some at the range so don't know how well they will hold up, but I did notice a larger group than the xp3. I think I was averaging 2.5" with those and the XP3s were 1" or less. With an A-Bolt 300wsm at 100yrds. Used the Power Max to break in my barrel. I know this doesn't help your inquiry but thought I would give you my 2 cents on my very limited experience with them. Good luck.