NO, the problem is that your barrel twist is for a lighter bullets.

As your bullet weights get heaver, you need more barrel twist to stabilize the bullet correctly instead.
So as you found out, with the 110gr bullet, the 1/12 will shine, but when you start to push 150gr and up bullets, then you are into 1/8-1/7 barrel twist rates territory instead.


As for when suppressed, the suppressor creates more barrel bore back pressure, which sends more gas through the barrel gas system to cycle the subsonic loads correctly.

So on that note, if you want to shoot heaver bullet, then talk to the builder about a barrel exchanging your 1/12 barrel for a faster twist barrel instead. Also, since you will not be suppressing the rig, then make sure that the builder gas ports the barrel correctly for the intended rounds you will be shooting as well.

Note on gas port sizes, too small of a gas port size for the load being fired, and the rifle will short stroke (not enough gas pressure to drive the B/C back correctly).  To large of the gas port for the load being fired, and the rifle will shot stroke as well (bolt trying to unlock too soon, with the residual pressure in the bore too high to pressure bind the spent case to the chamber wall, and the energy of the bolt trying to pull the spent case off the chamber walls cause too much of a B/C energy lose instead).