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@Airhead
I've had them come clean out with a fair amount of compressed brick due to the bolt pressure destroying the brick. It depends on the type of brick you're going into and the direction of force. In my case it was an indoor hammock so plenty of force in the wrong direction.
When it comes to heavy radiators which have a tendency to come loose, I've had a lot of success using a piece of wood slightly oversized, hammering it into the hole with some force then a reasonable size screw with a pilot hole slightly undersized for the screw. You can use some sort of liquid to slightly 'harden' the brickwork before you start the process it also reduces the dust. I usually make the dowel with a chisel and it's quite uneven which seems to help, wood also compresses on the way in and then 'bonds' a little more gently with the brickwork.