I've got brass if you need some.
So, do you put something in the round to make it feel the same? I've just used live rounds whenever I've practiced loading; and what I practice is: pulling two rounds from my belt with my thumb and two fingers, rotate my hand palm up, and drop both rounds into the empty barrels.
So far, using that technique I've been able to hit/stop the pop-ups and chargers at FTW. Usually there's 3 - I was there about a month ago and they threw in an extra pop-up. If you can successfully hit the first ones as soon as they pop, you've got plenty of time for the chargers.
Just remember, "Slow is smooth and smooth is fast".
My biggest challenge had been the break on my double, but after a few hundred rounds it loosened up a bit.
I'm in East Texas as well - send me your address and I'll mail you some brass.