[Guatariccan]

I'm waiting on my Gen 4 20 to arrive and was just curious as to what y'all deem weak ammo? I have 500 rds. of Underwood 180 gr FMJ and as those chug along at 1300fps, I was curious as to what your thoughts were on something like the Georgia arms canned heat at 1100 fps? I bought this gun just for the hell of it and don't really plan on getting too much ammo for it, but if I do I want something that will boom. I know it sounds weird but I don't shoot anything but 357 mag out of my 686 SSR, cause hey what's the point of having a magnum if I shoot 38s out of it, right? Thanks for your opinions.