Thread: Baffle strike?

My mates Howa 308 is tack driver but after taking it out fishing and shooting some goats off a bluff it's spraying all over the place.

I noticed some light impact on the inside bore of the end baffle of his Sonic suppressor, and it has kinda spiral rifling shaped marks like a projectile has hit.
Impact points are on opposite sides of the bore

Suppressor overbarrel and is tightly bushed at the rear, he's never taken it off either
He's been shooting mainly Winchester FMJ

Would firing a 7mm08 in the 308 do this? It's unlikely he has but may be possible