The simple answer to your question is yes you can but it's not recommended. I had been planning to do exactly the same thing, Tikka T3x lite in .308, cut to 18" and thread it to run a can. People say they do it all the time, but in searching for this answer I have found that many times they...
Great thread for me as I will be hunting next year with my 11 year old son for the first time. I’m going to try with all my might to enjoy the process and not just the outcome.
Tikka stainless T3X. They just flat shoot. I have literally never heard someone say they had a Tikka that wouldn’t shoot. My T3x with a proof barrel is a 1/2” gun all day.