What should I expect as far as accuracy goes? I can do my part, so I am just trying to get an idea of what others are getting out of this caliber. What would be an average group with a supersonic group (what load), and what would be average for subsonic groups (what load). I am shooting a Wilson Combat 16" heavy barrel.
I shot one 5-shot group for size out of my 16" Rem 700 at 100 yds with the Hornady 110 gr whisper supersonic commerical load. I got about 1.5" extreme spread and 1.2" center to center. The 5th shot was a called flyer, and if you throw that shot out the group, the 4-shot group shrank to about .75" c2c. This was the first official group I shot out of this gun, and it was shot off a bipod and no rear rest (well, a wadded up bath towel, so some type of rear rest I guess). Considering the huge jump of the factory 110 gr load, I should be able to improve those groups with some handloads from, say, the 125 gr Nosler Ballistic Tip.
You'll probably never win a short range benchrest match with the 300 BLK, but it's not like MOA at 100 yds will be out of the question. Plenty accurate for deer or hogs out to 150yds+ with the right load and dope.