Reading the rebate form, it says in part:
When you purchase $300.00 of any RCBS product, you
qualify for a $50.00 mail-in rebate.
So unless I'm reading something really wrong, you would also get a $50 rebate on the Chargemaster!
http://store.prophetriver.com/content/RC249_RebateCoupon.pdf
It does say max $75 rebate per household though....