May I ask what bands you consider to be "metalcore"? Or better yet, which bands in particular are you aiming for?
Reason I ask is because that term has been used for the WIDEST variety of shite I've heard. Nowadays, most people mean the chug-chug with catchy hooks style "metalcore", while others mean the mid 90's Converge, or even the late 80's Black Flag... Or maybe, you mean KSE?
I have a mahogany Schecter C-1 Classic with an AM in it going through a Mesa 2c+, and it can nail a wide variety of aggressive shite. I play mostly hardcore (CBK, Have Heart, Set It Straight, Killing the Dream, Trap Them, etc) to the more technical "metalcore" (Shai Hulud, old Misery Signals, BTBAM).