Eat Uranium;4562849I've noticed that the gun barrels (both in tanks and on the stationary guns) do recoil, but only when firing using weapon 1 (which is usually AP). Using other weapons (like HE or smoke) will not recoil the gun barrel.
I'm not 100% sure, but I do not believe those shells have the same amount of gunpowder an AP shell has.
I doubt that an AT gun will hit the exact same penny-size target twice in a row. I don't see why the gun can't have a recoil animation, either the whole thing or just the blowback.
AT guns should have some carriage recoil. The advances in propellant and such meant that the recoil dampaners didn't cover it all, and they still would recoil back, some violently. Guns like the Pak38 and 6lber should maybe shake and move a bit, but guns like the Pak43 or 17lber should move back more.