Yes, pistol mag pouches work great. I used them to carry my VSR-10 magazines and they worked like a charm.
The specific rig I used was a
MOLLE thigh platform with a
dual pistol magazine pouch mounted in the center. In my case I actually used two of them side by side, but since you only have two magazines that would be unnecessary.
This was an ideal rig for me because it allowed me access to the pouches while prone (a position you should get acquainted with if you want to be an effective sniper, just ask Rich) where a traditional vest would make the task very awkward.