Chinahand, Texas is almost all LEASE. There is some public land, but I don't know of any in the Laredo area. Bottomline, if you don't own, lease or have friend or family that owns land, then normally you don't hunt.
As for pistol hunting, I haven't been too many place that you can't take deer/hogs with the short barrel. As for being too hot for feral hogs, does it ever get cool? Tonight we are expecting the first freeze of the year, yesterday it was seventy degrees. By the end of the week we will be back in the low fiftiies. If you don't hunt when its hot, then you don't hunt.
Welcome to the Great State of Texas............................