Hey, I like the idea of different bore linings. Chrome lining was a good first step. How about Teflon jackets on bullets? 100 times better than molly.

Also, I have contemplated moving the barrel down under the ammunition source to lower the thrust angle and keep the barrel down under auto fire. Safety might suffer, but I was thinking more of a balanced system where the muzzle would neither sink or rise.

I guess the secret to low diameter, high cross sectional density rounds (needles in sabots) is keeping them spinning (they have low angular momentum) and making sure they expand on impact.

Powder needs another quantum leap. Higher density of power would make cartridges much smaller, if not much lighter. But, some wahoo would load a 30-06 with it and blow themselves to kingdom come.

Airguns have been making big technical strides. How about a chemical reaction in the stock that would generate a high-pressure gas to launch a bullet?

Just noodling things through.

Chubber