Mirage hasn't been much of an issue, but I really keep the cover on it to provide "bump" protection more than mirage issues as I seem to routinely tap the end of it when moving. The 10 rounds in under 5 minutes caused very little mirage.....one hell of a lots less than my Hybrid on a 338 WM after 4 rounds!. I was told by a very knowledgeable Gemtech rep who is a friend of mine (I live where gemtech is made) that when the can hits 800 degrees F it will fail and reliably so at that temp. As you can see 20 rounds gave him right at 220 degrees, so there is plenty of room there. I have seen ZERO POI shift at it heats up in any of my guns. I run the second can on a 223 rem model 7, 243 ruger 77 mk 1, and 30-06 win mod 70 and don't have issues on them at all.
I think you will be happy with it in the PRS mode. The only drawback I see is the life of a aluminum can will be shorter, but then again you can get a couple of trackers for the price of one of the others.