What caliber and load level do you plan?
I can't imagine a very hot load with heel type bullets in a straight case.
Gunplummer describes a "shellholder" action, similar to what is seen on some economy model .50 BMGs. It will work... but not very fast.
You could try headspacing with the bullet against the origin of the rifling. It MIGHT hold against the firing pin fall. But you would still have to furnish a rimless extractor.
Instead of a ball detent, look into a chisel pointed locator spring loaded into the extractor. This is how the extractor on a double express rifle that the customer insists be chambered for a rimless round works.