This sounds like a particular issue with that ammo to me. I havent had any visually obvious shortening from twice that many re-chamberings with HST or gold dots in a few 9mm flavors.
Heres the protocol I recently adopted:
I have a box of 147hst(my carry load) on my dryfire table. After roughly 6 re-chamberings, I take that round and put it in the box face up. I take a new round from the box and load it into the mag. Now that new round will be chambered when I re-load the gun. Once I have 15 face up rounds, ill load them up and take them to the range.