I don't know about the Federal ammo being old, but my theory on the primer looking fine is that the case gave way first. That would imply the pressure isn't too much but rather the brass was faulty.
Tikkas and Sakos as as a general rule have tight chambers and and tight headspace. This keeps the brass from showing primer flow or craters as easily as some other guns that have larger firing pin holes, more headspace etc. Sako and Tikka are well known for shooting over book velocities and not showing pressure signs. The loads are still over pressure but the conventional signs may not show up. Most of you already know that by the time you get case head or rim expansion, ejector marks, loose primer pockets, you are already way over spec pressure in most cases.
You can call it faulty brass if you want but the long and short of it is these loads were far over pressure for the case and components used. DO NOT shoot any more and get the gun checked for scoring, damage to the chamber, bolt etc.