I'll bite,

How in the world do you know the factory (?) ammo was loaded with the wrong powder?

It "blew the bolt open"

?!

Are you saying that the bolt, all on it's own went from closed/battery position, to "open"?

What does the fired casing look like?

Have you had anyone inspect the rifle?

Have you talked to Savage about it?

If it's "brand new", and not just new to you, I would send it back to Savage and have them check it out, and check headspace while they had it.

What ammo maker, load, lot number of ammo, and have you spoken to the ammo maker?