If it is for AR and it is for hunting then good luck finding all your brass in the grass. The cost of the replacement brass alone would make re-loading uneconomical, unless of course you’re sitting on several hundred or more once fired cases. Assuming also that you have a 1:8” twist rifle or else you are going to struggle to shoot these bullets.
If however it is for a bolt gun and as per comments above your mag allows you to maximise the COAL, then the 77gr TMK is a fantastic little hunting bullet despite what Sierra say about its intended use. They perform very similar to the A-MAX, super accurate, frangible but not too explosive. Not long after they came out I spotted for one of our guys using them in a 1:7” twist Savage varmint rifle, on goats and fallow. They were as effective as my .243 shooting Sierra 85gr HPBTs at the same kind of range.
Since then I’ve wanted to build a fast twist .223 varmint rifle...
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