Hawkeye75,
I use all my pistols for IDPA competition. In a timed course of fire with reloads on the clock a slow reload can cost you big time. In the five IDPA national championships I have participated in I have found that if I have to add one second onto my reload time it can very easily drop me down 10 to 15 places for the stage.
In IDPA competition the 19rd mags that come from the factory are not legal because they are too long to fit in the "IDPA box". So although my factory long mags drop free I can't use them. Unfortunately none of the MecGar mags I have for my other guns will drop free from the Phantom, although they do indeed drop free from my other pistols.
As far as my gun is concerned I have found no way to really fix the problem. The external dimensions on the MecGar mags are just larger than the factory ones. The fatter mags just stick in the relatively narrower mag well.
If you would please do me a favor and test your factory mags then your MecGar to see if you have the same issue. I'm curious to see if mine is a fluke. However, there has been another guy on the CZ forum that has reported the same results as I.
I prefer 124gr ammo in all my CZ's. I have found a noticeable increase in accuracy over 115 gr. Some people have reported reliability issues with 147gr ammo due to the tighter chamber dimensions on the CZ but I personally haven't experienced that.
My carry load is Speer Gold Dot 124gr +P.