Originally Posted by
chetmarks
No, no typo. I bought it from a forum member and it didn't have a factory barrel. It had a GM 1:28 twist 45 cal barrel on it. I knew that before I bought it of course.
That explains why it doesn't like a PRB. Your barrel was made for modern ammo. It's like shooting a PRB in an inline. It sort of works with light loads at short distances, but fails with hunting loads.