Jonny,
SE is indeed sintered iron and will wear the barrel down faster than you can spell 'wear'.
Steel jacketed ammo WILL also cause more wear to steel barrels than normal brass jacketed, or solid lead ammo. The stuff is prohibited on most ranges (including ours) because of the steel core and the damage it can do to range installations. Not because of barrel wear, as the steel core is embedded in lead within the steel jacket.
But all that aside, the message is: The stuff is crap and should not be shot in a P08
