Not sure exactly what you are referring to but, based on your initial post I'm guessing it's related to the "bullet creeping out of the case" (crimp jump). As you mentioned, crimp jump can tie up cylinder rotation if the bullet extends beyond the face of the cylinder and butts up against the barrel shank.
It's also possible that it might cause some accuracy issues depending on severity, powder type/charge, range to target to name a few.
It's typically not a dangerous condition if that's your question. I suppose that very short cases with light for caliber bullets in long cylinders might cause a squib of some sort (pretty unlikely).
Here's a picture of some factory .357 loads (Magtech IIRC) where the bullet moved forward under recoil. Had the same thing happen with Rem 38 Special +P 158gr HPs. Being a handloader, I reseated/recrimped the bullets in the pictue and recrimped the remaining unfired ammo.
I'm a little surprised that you had the problem with Grizzly ammo. Is your lightweight 629 a Titanium/Scadium M329 or a short barreled 629?
Paul