Missouri Bullet Company list a 245 grain hi tek bullet with .309 diameter "for subsonic work" with a BNH=20. At 1050 fps do you want that hardness? Seems like 12 to 15 would be better for hogs at subsonic speeds. What is their rationale here??

.300 Blackout - Hi-Tek
.309 Diameter
245 Grain RNFP
Brinell 20
For Subsonic Work
Note: Approximately 238 grains @20 BHN
Hi-Tek 2-Extreme Coating
Price per box of 250
Price: $40.00

I'm guessing right offhand that they went that hard since it will be shot out of at least a 16" barrel and want to minimize chances of leading. But that does seem kind of hard for a bullet that's supposed to be shot less than 1100 fps to me too.

Since they are coated I wouldn't worry too much about how hard they are. When pushing through a tough hog you will want the harder bullet so it doesn't decide too quickly and not penetrate.

If you are not sure write or call MBC and ask them. The owner is always willing to help.

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SWCA #3437

Hardness selection isn't related to velocity, it's more dependent on pressure. But it doesn't matter a ton, especially not with a coated bullet.