[GoforBroke]

I was wondering if the cannister round causes increased ware in the chamber of the gun?

if so it may be a factor in the delay to implement.

[Monterrosa-24]

"I was wondering if the cannister round causes increased ware in the chamber of the gun?"

I doubt it because it is a smooth bore gun designed for the screaming velocities needed for the maximum effectiveness of the depleted uranium penetrators. These canister rounds could be pretty hot and still mild compared to the anti-tank rounds. In the chamber itself the shot should not touch the metal judging from the illustration.