Brass casing cracked. no response from customer service. - Sellier & Bellot 6.5 Creedmoor 156 Grain Soft Point Rifle Ammunition

Bought a box of this ammo. About 10 shots in my daughter said the rifle (Ruger American 6.5 cm) felt strange. I shot as well and felt a strange recoil in the rifle. Upon inspection, the brass case had ruptured when fired. Cracked from the rim half way down the case. I picked up our spent brass and several rounds had done this. Contacted customer service via email to show what the rounds had done and never received any communication back. I mainly wanted to report that this batch of ammo was bad. After inspecting the rifle it did not seem to have damage and was able to finish out the range day successfully with Winchester rounds. For what it’s worth, the range pros said it looked like the rounds had way too much pressure. Usually only seeing that with hand loaded ammo. Pass on this purchase. Don’t risk it.