A cursory image search suggests that the H&K caseless round had a "wall" at the front to help introduce the bullet into the barrel and avoid blow-by.

Your round sounds like it would simply fire the bullet into parts of the barrel other than the chamber more often than would be desirable.

1. No.

2. Why?

HK came up with caseless in order to eliminate extraction. They needed to eliminate extraction to increase burst rate. They wanted to increase burst rate to improve Ph.

Caseless ammunition is inextricably linked to the operating system of the G11. If you aren’t compromising the design of the firearm to meet the specific purpose of the HK designers, caseless offers no benefit. Even if it worked, which it doesn’t.

Your idea makes caseless ammunition worse for no reason.