Dude please fucking don't. I had the charging handle on the Meth-Tec sub2000 shear off in the middle of firing underloaded Winchester White Box 115 grain, and I considered that a best case scenario failure. The gun isn't meant to run +p, let alone Bubba's pissing hot loads, and is frankly not a serious firearm. There are plenty of actually affordable 9mm carbines out there that can handle higher pressure rounds that are comparable price, or perhaps a bit more, that you should use if you want to dick around. Unless you have the piece of shit in a lead sled, with you pulling the trigger with a string, from behind a bullet resistant barrier, then you really shouldn't be fucking around like that.