Growing error from west to east when overlaying raster and shape

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I am using a shape of Austria from gadm.org which I want to overlay with a netCDF file in R.As the netCDF has projected coordinates in EPSG:31287, I have reprojected the shape using FWtools and the .proj4-string from spatialreference.org.

Unfortunately the shape does not fit the raster data: The best fit is in the west, and the error grows in eastern direction (shape has a bigger extent in eastern direction than the raster). The north/south extent is correct.Any ideas what could be wrong?I already tried to play around with lon_0 values, but as far I am informed correctly, this causes only a general shift.



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