Free: Contests & Raffles.
I’ve seen this! It just so happens that SAAMI 308 ogive will headspace on 270 shoulder in the chamber! A guy I know put a 308 through a Winchester M70 in 270. Good thing he was using soft jacketed bullets rather than copper. Believe it or not, no damage to the rifle. The case just turned into 308 super Improved. And...the bullet hit within 2 inches of his group.
It happens, glad you walked away from it. I sure would be curious as to the velocity of that shot.