Had the same issues with a Savage 12 F/V, 6.5 CM. Solved the issues by using CCI #41 primers.They did update the shroud, Bergara sent me a new one that looks identical to the original
but is made of steel.
My rifle is a older B14 made in 17 on its second barrel with over 4K rounds through it. Now
the main issue with the rifle (older ones at least) was that the firing pin hole in the bolt
was large and if it pierced a primer the gas would push the firing pin into the back
of the bolt shroud and break it.
My particular rifle would crater CCI450 primers so I had the bolt bushed and now it is
good.
Please expand on "BOLT BUSHED"
Larry