I did see the notion of higher speed ammo (high brass, right?)...I was running an offbrand 1265 #4 failing, then went Winchester 1325 #7, and that still only got me to 10 in a row...leaving me open to a lot of zombies. I'll run stronger for HD, but want to practice with lighter. Regardless, I need to know it'll fire, and I don't have that with Keltec, or any other bullpup, now, for that matter.