For USPSA PCC stuff?
For what kind of mag?
Glock? the coda will hold a 40+ round Glock mag very well. I tried one but didn't care for it, with how deep it is, you have longer to draw the mag out of. Some standard size pistol mag holders are not deep enough to securely hold a 30 round or longer mag. These pouches from
Comp Tac are deeper than normal and hold very well.
I use different mag pouch for my speed reload mag (classifiers) vs general use mag pouches. For speed reloads I liked a 17rd mag with Taylor Freelance +10 as a handle mounted at 12 o'clock on my belt in a Guga Ribas
Guga Ribas pouch with bullets out at a similar angle to the coda pictured
hereAt about 9 and 10 o'clock are two comp tac pouches for general use. In a field course I would have 40 in the gun and a single 33rd on my belt at 9 o'clock.