I recently bought a brand new Tikka T3x in 6.5 creedmoor, and I started to see pressure signs with factory ammo. I noticed a tight bolt lift and markings on the brass head. I've never had a rifle do this to me so I'm not sure if it is ammo or rifle related. I was shooting Hornady Superformance SST 129 grain. It's strange because I've used this ammo in other rifles and had 0 issues. Any help is appreciated as this has never happened to me.