I recently purchased a Glock 20SF, which now is my number one favorite gun. To have some brass for immediate reloading I bought 50 rounds of the factory Remington 180g ammo. (I've since ordered a batch of Starline brass.) I have reloaded the Remington brass at least five times and can see no visible signs of weakness or cracks or "smilies." I've been conservative thus far and most of my loads are less than about 1150 fps according to the manuals. Does anyone have a point at which they retire brass, or should I just inspect carefully at each reload and continue to use the brass until cracks appear?