Before you try your T8 on your 270, I'd check with the manufacturer or Jackson's Rifles first.
I had a T8 model for a 223, and IIRC the manufacturer reported that a .243/6mm bullet would *just* fit though the baffle stack. If you have a similar T8, then the .270/6.8mm bullet might be a bit too wide -with disastrous consequences.
If your T8 model is for a .308/7.62mm bullet then you'll have no problems, but it's best to check before pulling the trigger.