For whatever it's worth, all ours in my last unit were Mossberg 500s with almost all of them converted to pistol grip only format for breaching.
For breaching we used #9 birdshot, which is widely available in the US ammunition system. The only times I saw Hatton rounds were when we did some training with some Tier One guys. White side SF used #9 shot and it was effective and acceptably safe for breaching.
The other round we had routine access to was 00 buck (9 pellet). Way less fun to shoot than the eight pellet reduced recoil load issued for my police shotgun.
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