I have a 9inch 300AAC BLK SBR that I generally run with a suppressor. My question is not about the affect it has on the POI, I am aware that with/without it there will be some change. However, in the past, to calculate Maximum Point Blank Range, I would need velocity, BC and a calculator.

For the 200gr SubSonic load for example, I know its velocity out of a 9 inch and its BC. If I want to zero my MPBR with the suppressor, I feel like it changes the inputs? The velocity change should be minimal right?

Is it really that the MPBR is the same regardless, but the POI will be affected if I zero with or without the suppressor?