Paradox,
Precisionreloading.com has once fired Remington industrial hulls for $20US per 100 and $70 per 500. I have a few hundred and have only used them with smokeless to date, but have used several types of BP with plastic hulls in my 10 bore without any issues. Just a thought to tide you over until your RMC brass arrives. Dave Casey's stuff is top notch!

Bob