For about the same cost I would rather have 2,000 rds of M193 than 1,000 rds of BH for SHTF, because you can go through ammo real fast under stress. M193 groups well in my 1/9 Bushy, and I agree that you should choose based on what is accurate in your rifle.
I also keep one bandoleer each of IMI M855 and Federal 69 gr Match (these two are the most accurate in my Bushy) for extended range use with my SHTF stock and practice regularly with all three. When I first started I only kept 2 bandoleers of M193 for emergencies [rolleyes] Welcome aboard!
Oops, I started this before your last post. If BH 75's shoot well for you, that is the most effective of the two rounds has has a longer fragmentaion range. Many posts on this new choice for use in Afganistan, etc.