SIG MCX PISTOL

[TJC357]

Here's a SIG MCX in 300Blk.Out, this is my first AR style pistol and my first 300Blk.Out cal. This has a 9 3/4" Bbl. SIG BRACE w/ 1-5 Twist topped off with TROY IND. Battle Sights and a Trijcon MRO w/ Larue Quick Mount. What brand and bullet weight would anyone suggest for me to use, I don't have a suppressor yet that is in the works, is there any brand of ammo I should stay away from. I'm getting everything together to start reloading for it. I'm hoping to take it out over Labor Day and run some rounds down it, here's a pic or two. Thanks for looking.