I ran Remington factory 115 grain fmj's out of my TruBor
when it was new (three years ago) - worked fine if the
gun was very clean and well lubricated. When the gun
got dirty it would choke once in a while.
I could have lightened the recoil spring, I imagine, and
stayed with it = but I found a source of major ammo and
have been shooting major since. For practice I loaded the
rounds to PF 150 and they worked fine, now I use 160 PF
ammo for practice, and they also work perfectly.
I was very happy with my Brazos TruBor, by the way.
Don't forget to get some tuned mags - just NEED two
140's and one 170 - more are better but you just need
the three of them to start.
Good luck with it.
Thank You very much for the info,greatly appreciated