Maybe you will.

For me free style means use whatever you have towards your advantage.
This summer was shooting a match where we had 9 classics and popper.
Simple stage, on one side of the wall/barricade 5 targets and 5 on the rights side. I was able to have 19 rounds loaded to my mag(126mm) and it took me on average 2 sec faster then those with small cap mags where they had to change it between.
Said all that, I still like the idea of fixed mags to a certain nr for a match so everyone has same chances, however I must agree with Sean, that this is not possible.