Yep, over pressure.

When was the last time you really cleaned the gun good? Excess carbon can create that mess in addition to a hot loaded 270.

Likely your bolt face is screwed up and needs fixed too.

Some strange things happen with factory ammo. I had a 257 Roberts that had a 6.5 bullet in it from Hornady. A Winchester 264 WM factory load that looked like a factory 7mm crimp had been shoved down on it shoulder looked almost Weatherby like except for those 4 places it wasn't crunched so much. Remington 270 with a 7mm bullet in it. 22 Hornet with a crease in the neck and another in the same box with a crease in the shoulder and body. a factory primer in backwards

Good examples to inspect your ammo.

Something like a wrong size bullet might or might not chamber but would dang sure increase pressure if you did and fired it.

Agree with the others though high pressure for what ever reason.

Agree, it’s a box of core lokt, with Winchester casings. Some are mismatched but the box was opened for the first time today.

Agree, it’s a box of core lokt, with Winchester casings. Some are mismatched but the box was opened for the first time today.

Are you sure they are Winchester cases and not just saying "270 Winchester" on them to indicate the caliber? A Remington factory load should have a "RP" stamped on the case.

Yep some of those are Winchester cases for sure. If that box of ammo was still factory sealed when you opened it then I am speechless. I have no idea how that happens and have never even heard of such a thing.

That sounds like reloads in a Remington box to me

T would be calling the manufacture if truely first time box opened

Update: Son got the gun back from Savage. They only had to install a new ejector.

What does a sealed box mean?

Sealed by what?

All the Remington rifle ammo I have seen can be opened at both ends.

No surprise there.

Update: Son got the gun back from Savage. They only had to install a new ejector. They fired it and checked it over good. It had to be a bad round as was suggested, Son is selling it anyway. Savage 111 270 winchester and 9.5 boxes of shells for $400.

In the meantime he bought a Tikka Roughtech 7mm Mag and loves it.

I don’t think that ammo came directly from the Remington factory. Remington makes their own brass. An over pressure round locked your rifle up. You can’t blame the failed ejector on Savage. I would suspect a hand load worked up in Winchester brass, subsequently loaded in Remington brass with less internal capacity to be the catalyst of the over pressure. For discussion sake, moving forward I would be leery of any box of ammunition containing mixed head stamps that you did not load yourself. This points to the reason I don’t shoot anybody’s reloads other than my own. Factory ammunition is not manufactured with mixed head stamps. Glad nobody got hurt and that the rifle had been repaired.