I haven't experienced any issues at all with FS rounds, but I don't have a Hammer7 either. They've worked great out of all of my Tiberius guns and my SR1, no issues with burrs either. Out of several hundreds of them I've found one with a cracked fin but I didn't notice a change in how it performed after shooting it.
Bad batch maybe?
Originally Posted by chopper duke
I'd wipe, play-on and overshoot.