The 3CR catalogue is one of the best studied sample of radio-loud active galaxies, spanning a wide range of redshifts and radio powers and being unbiased with respect to X-ray observations. We are completing the Chandra Snapshot Survey of the 3CR catalog. Preliminary results on the extension of the X-ray observations in the 0.5-1 redshift range are presented here. We compared Chandra observations with radio maps to search for extended emission associated with jets, hotspots and galaxy clusters. We found the X-ray radiation arising from the intergalactic medium in one galaxy cluster and we detected three hostpots in the Chandra images. X-ray emission from the core of all radio galaxies in our sample was also found, seven of them also showing extended X-ray emission around their nuclei.