Could be, who knows. Could be a multitude of factors from bullet runout, too hot primer, inconsistent bullet depth, bad batch of brass, or even the gun is just not capable, and no offense, but sometimes its the shooter.

Problem is people try to start reloading the hard way and try to build competition grade ammo right out of the gate. It just doesn't happen. You will become frustrated and reloading won't be much fun. You have to start with the basics, and then start changing one component here and there and find out what really helps and what really don't. Start looking for some tips. Like squaring your dies. Might have to invest in a head and shoulders gauge, or a comparitor. I won't be without either.