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From your picture, you have removed the 'plaster' from approx 1/4 of the wall.
Are you intending to strip the whole wall back to stone?
Is it likely the remainder is cementitious and more stongly adhered than the real plaster?
(If you tap it, it should sound more solid).
2J or 8J spread across a spade chisel will not be enough force to induce a crack between the stone and the cemplaster to remove plate size lumps at a time.
A reduced power SDS + scutch will remove it, but eventually. -
Get both! I bought the 033 I think, primarily for chasing out a rubble wall, but also with a job like yours in mind (that I never got around to!). I wouldn't want to smash up concrete with the DeWalt but I wouldn't like to hold the Titan above waist height for very long.
I realize two SDS drills is a bit excessive but the Titan was £50 back when I bought it.
Thanks all for SDS chat and advice - useful info. And yes I'd been thinking dewalt cordless largely because i have dewalt cordless stuff already and plenty of batteries. The only corded thing I have is a faff and I rarely use it. I could get a corded one I guess given the boost in power. I'd seen the DCH033 before and was initially looking at it but a couple of youtube reviewers suggested getting the 133 instead which was comparably priced but much more powerful.