After limiting myself to 223, 308 and 6.5CM in my rifles for many years, I'm at a crossroads for my next rifle. I already have .223 in 11.5", 14.5" and 16" ARs as well as a 308 LMT with 18" barrel and a 6.5CM 24" bolt gun. I'm trying to decide between these three calibers for no particular reason:

1. 9" 300BLK
2. 11.5" 7.62x39
3. 13" 308

The 300BLK, of course, brings subsonics to the table. However, although I have a 30 cal suppressor, my local range(s) always have other shooters that are unsuppressed. The 7.62x39 is cheapest to shoot of the three and 308 is the only one of the three that I already have ammo for. The idea of a 308 SBR is also tempting for some strange reason. Any of these three could be used for home defense, hog hunting, range days, etc. I don't have a specific use-case for them, but just thought I'd ask for some opinions and possibly have a discussion.