Subsonic 175s over Red Dot for 10.5" pistol gas?

[jasonusvi]

I plan to shoot my Noveske 10.5" 1x8 300 Fireball with pistol gas system for the first time this weekend. My goal is to keep the variety and cost of components down and so want to use 175s that I use in my 308 and powder I can use in my 45acp.

I have seen a few loads starting with 175 over 6 of red dot. Anyone have experience with this particular load or a similarly compatible load?

Had this barrel made LMT MRP compatible so can swap it with my other barrels in a few minutes time. Standard 556 bolt and mags made it an easy decision. Not to mention cheap brass vs. pretty much anything else out there.

Thanks