Got some range time with the G-48. This was my last 20 rds at 10 yrds. Got a little sloppy with 4-5 rounds. Was trying to put all 20 in the center 4 squares.
Which dot and ammunition were you using? Sage Dynamics on YouTube has some really good info on dot zeroing, ammo selection, POA/POI considerations with cowitnessed iron sights etc. You may find it helpful/interesting.
Also, if anyone is a Veteran, .mil, LEO first responder GT Distributors has the absolute best prices on Glocks around.