You could beat your barrel against a tree and not warp it!. And I highly doubt it would bulge no matter what you shot out of it either.

I have never heard this from this ammo or any of the stuff close to it. As a matter of fact I don't hear too many bad things about the SST's.

My guess is it was someone shooting them out of a smoothbore or something, not out of a rifled barrel made to shoot sabots.

Paul