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Thats one big boy caliper, the lower bolt was definitely filed away. Shimano fit just fine, there is quite some wiggle room, attaching a better photo of the caliper. If i were you i would try what alsoPhilDAS suggested - fit a 180 rotor, there seems to be room, and it would be the least expensive way to sort this.
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Did your rotor come with the adapter to mount it or did you buy it separate?
ie. like this IS adapter:
https://www.wiggle.co.uk/shimano-disc-brake-calliper-adapter/
This is my issue - the Magura Louise can't be moved back because the frame fouls:
It already looks like mine has been filed a bit to fit the caliper.