Call me what you want, 1 shot test 400 in the glute a couple years back was so painful i never took it again, the next day i felt like tyson spent 2 hours punching me in the @ss with lead gloves, bad news....horrible..
Also, i agree, switching sites i way important, i do shoulders, glutes, tris and quads in a rotation. Years back when i was scared to shoot anywhere but glute, i did some winny and shot the same glute 2x in one week, my glute swelled like a soft ball was in it, couldn't walk for a day or two.....not good, it's amazing the stupid things we put ourselves through..