I had a 21 that I shot the 200gr LSWCs in for IDPA. The LW barrel had tighter dimensions than the factory requiring properly sized cartridges to feed reliably. Using range brass, I'd get the occasional failure to return to battery. At that time I was using RCBS dies. I added a Lee Factory Crimp die and all the problems went away. Feeding was never a problem. I current shoot mostly .40. I load the Missouri Bullet 170 or 155 gr LSWC, using the LFCD without a single problem. After all, it's a Glock!
Savage