Good choice, not as loud as other calibers (unsuppressed) as well.
Although I'd hate to shoot near on anything indoors without ear protection (home defense in this context), .300 would be far closer to a handgun. Hearing damage wise. I'd think anyhow.
Where .223/5.56, & up calibers could likely permanently damage hearing after just a single round fired. Just IMO.
300BLK will mess up your hearing just the same in supersonic, might be a little less with subsonic