The Army has been testing 9mm and 20mm sub caliber training rounds for the AT-4 rocket launcher. At about a hundredth of the cost, the 20mm round provides similar recoil and blast.
Army.mil reports …
Staff Sgt. Aleksandr Kulik said the 20mm round could be highly beneficial if used in basic training, where only a few Soldiers get picked to fire an 84 mm projectile from the AT4.
“After shooting a 20mm, I expected a bigger kick from the live one, but it was pretty accurate,” he said. “If privates get to shoot this, it will give them an idea of what it’s like to shoot a real 84 … The practice 20mm has the reality of the kick and back blast, and it’s just as loud as the live one.”
Project managers and training developers will use the experiment’s results to help decide which sub-caliber training round gets selected, but they said it would be at least two years before either is fielded.
Using rifle ammunition for training rocket launcher and even artillery operators is quite common overseas.
[ Many thanks to Lance for emailing me the link. ]