Blown primer. New rifle. Only 1 round fired.

[Robobiss]

Since we are all spitballing here and OP is definitely going to send it back, I’ll throw in a scenario just for fun.

What are the chances that it is chambered correctly in 280AI like a lot including OP seem to think, but they accidentally chambered a .277 barrel in 280AI instead of a .284? What else would cause crazy pressure like that aside from some seriously effed ammunition?

Anyone?

 

[Jason Snyder]

What else would cause crazy pressure like that aside from some seriously effed ammunition?

Excess headspace.

 

[Robobiss]

Excess headspace.

Come on now, let’s not be too realistic. I really thought I was onto something