Not taking enough ammo. is more of a problem than taking too much ammo. I'd say you're close to having enough for a good two day, maybe a two and a half day of shooting! Make sure you take your gun cleaning supplys, and switch out guns frequently to let them cool, and also, make sure you store your extra ammo. in a cooler, or at least not in the direct sun light! Make sure ya take some sort of sun shade, large umbrella is what I use, it just makes it more fun to sit in the shade with a cold drink, a clean/cool gun and lots of targets and more ammo!!
Have fun!!