There is actually a lot of 6.5x55 online: ammo and cases.

According to the Nosler reloading manual rim size for the Swede is .480 and for the CM is .473. US brass has been a consistent .474 for the Swede brass I have checked. Like I said Lapua was larger and would not fit my Barrett. Being a Tikka would there be too much slop in the bolt face to go to a CM if made to Euro specs?