I've been using the 300gr Barnes Expander MZ for two years now. 4 total deer taken with them in my CVA Wolf using Harvestor Crushed Rib sabots, 2 50gr Pyrodex bullets, W209 primers. This is a 300gr Expander I recovered out of my spike buck I killed last year. I also get 1 inch groups at 100 yards with this combo.