I'm convinced the problem with my .40 75B was the 165 gr. Win VP ammo; at the time, I wnated to modify the gun so it wouldn't be ammo-sensitive. In hindsight, I probably should have just avoided the VP then like I do now, because 180 gr Blazers, Lawman, UMCs, S&B, 180 gr Win Whitebox, Fiocchi, and Fed. AEs always fed fine. No big deal, because the gun runs great now. In fact , I have 3 boxes of Blazer Brass that have been sitting in the safe too long, so I may take the CZ out for a range date this weekend.