Is there a stength difference between these two or is it just extracter groove depth? The reason I'm asking is I'm going to buy some new brass to load in my .38 super dies for my SA Mil-Tech .38 super. I've been shooting both .38 super and 9x23 out of it. I don't know if I can run unfired 9x23 into my dies because of the case taper. So I'm wondering about these other two. I want a fast, flat shooting, hard hittihg load to use on running predators here on the farm, coyotes being the largest.