Not trying to be a smartarse here, but my experience with the 300BLK and subs was about the same using 208gr A max and 220 SMK.
Because you have to get so close to the animals (due to the rainbow trajectory) I would generally head shoot them or when these shots didn't present themselves I'd go for both shoulders.
Personally I wouldn't let that one experience put you off.
Using subs for me was more about my hearing and the dogs comfort. If you are expecting supersonic results you will need to spend some $$ and use the Lehighs.
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