300blk 208 amax supersonic?

[Coletta]

I was debating the trial of a supersonic 208 amax out of a 300blk. Looks like getting it to 2000 fps would reach 800 yds before going transonic. I have not found any load info anywhere for this, but I have found a company that advertises 2150 fps (with 208 amax)from a suppressed sbr platform, which would stay supersonic to around 900yds. Let me know if you have tried it. Powder, rifle type, results,...?
I am using a 16" boltgun

 

[BoilerUP]

300BLK has an awfully small case capacity to move a 208gr bullet at 2150fps, especially from a SBR...hell it seems most 20" 308s need a stiff charge of RL17 touch 2500fps.

 

[Coletta]

I agree with the low case capacity and sbr comment, which is why I am trying to gather more info. Check out Freedommunitions.com website (I am sure i broke a rule or something by naming a non-sponsor). They are either full of shit, or sprinkling unicorn dust in their powder.