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I've picked up some Hornady 53 grain XTPs and 55 grain Vmax and have started rolling my own ammo. Both are very accurate out of the M&P and I'm not overly worried about over penetrating with either round. The Vmax is my first choice for the load for obvious reasons.

So I took the dive into the evil black rifle pool this weekend with an M&P 15 (early daddy's day present from my wife). I've never owned a rifle, let alone one that is evil, so what would be some good HD rounds to keep on hand for this?