without knowing how the user is attempting to chamber the particular round it could be the pistol or the user?
generally a through breakdown and cleaning , then a good lubrication and reassembly, then running several hundred FMJ through the gun to loosen it up and most problems seem to disappear.
OF course any semi auto can balk at a particular ammo, so its always suggested to try several self defense ammunitions and go with what works 120% of the time, to choose a particular ammunition simpy on brand name or color of box and not try it in the gun doesn't make a lot of sense.
MY particular 738 will run so fra on any of about 7-8 different self defense rounds and several reloads as well, including Gold Dot, Golden Sabre,Hornady FTX, Fiocchi XTP, and copper O projectiles.
it just depends on the particular gun and the shooter.