sometimes. I never played with Critical Defense but I do like Critical Duty, and have fed it to a lot of my guns many of which are similar to OP’s. In my examples the polymer area of the bullet didn’t touch the barrel, but the bullet shape may be different between Defense and Duty.
In my experience there has been no issue feeding *230* HST or Gold Dot to these guns. 200 has been hit or miss with a couple of them.
Generally, if it feeds H&G68s well it will feed reasonable Defense ammo; and if it won’t, it needs fixed.