Oh my bad. I wasn't sure if that was a .308 or 6.5 because you said you shot 6.5 this weekend.
If that is a .308 you should head to the 10 yard pistol range. Bullet drop should be manageable at that distance...
I've been looking at doing something similar. I had a shorty 300 blackout years ago and have the itch again. I'm pretty set on building it myself around the 8.5 inch centurion barrel.
https://centurionarms.com/cold-hammer-forged/8-5-300blk/
I have a 14 inch on a budget aero 308 build I did a year or so ago. The best part was being able to slide the rail on and off when I was tuning the adjustable gas block.
Other than that it's just another rail.