***one way to do it ~ on the other hand, returning to the original Chinese idea ~ little rockets***
They tried that with the Gyrojet firearms back about 45 years ago.
http://en.wikipedia.org/wiki/Gyrojet
Anything tried before the computer age needs to be tried again! I recall when I was a kid that drones (model airplanes) worked much better with a string!
If we were using it just once ~ until the rounds ran out ~ we could probably make the tubes from heat resistant plastic. You could also simply poke the tube in the ground and find cover before you started using it.
Your target people would definitely need to resort to some high ticket computerization to track back that launchpath, so this would provide more protection to any soldier using the devices.
For personal stopping power you might want to carry an old fashioned 1911 .45 ~ but that's for situations where you might actually come into direct contact with the enemy.
I'm figuring that with remote fire control capability you wouldn't need to have rounds with a range much beyond maybe 100 meters. Fly the tubes into the killing zone by drone, and begin pattern firing by remote.