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Quig, the boys at Big Green had several bazillion more dollars to throw into development than I had. They eventually came out with Accelerator rounds in .30-06, .308 and .30-30. Their factory ammo would shoot about as well as the rifle was capable of. In other words, if you fired them in a deer rifle that usually shot 3" groups, then the Accelerator rounds would group about 3".
But hunters soon realized that a 3" group in a varmint rifle wouldn't cut it. So using their deer rifles as varmint guns didn't pan out. Which in turn meant that they quit buying Accelerators.
And Remmy isn't about to make things that don't sell.
As I see it, the problem with home-grown sabot rounds is inconsistency. I found it difficult to find a proper bullet-to-sabot fit. Even with a special seating tool, it was difficult to get bullets seated exactly the same in the sabots. Boattails were especially awful. Then it was almost impossible to get consistent neck tension on a seated sabot because they were so slippery.
Then, I also believe that the slipperiness and low mass of the sabot/bullet make it almost impossible to find a powder charge that will burn properly. The pressure curve/timing/volume/friction relationships are just weird.
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