This weekend I am taking my fifth formal carbine class. In the first two classes I took (Gunsite 223,556) I bought PMC ammo. I bought it for the first class because that is what my local dealer happened to have and I just bought the ammo package with the class the second time and that was what they gave me. I experienced several malfunctions with that PMC ammo. In one case I had a failure to fire, I attempted to clear the malfunction and had the bullet come out of the case and fill my action with unburnt powder. After that, my rifle was a PITA until I cleaned it at lunch time break. PMC was no where near the cheapest ammo out there.
When it came time to take my next class I decided to make a bold decision. It was a decision based on what I consider to be extensive personal experience. It was a decision that would not be popular with the instructors or with the on-line armchair commandos. The decision was to use Wolf ammo in these classes from now on. Why ? First of all, unlike that PMC, I had never had a single malfunction with Wolf ammo in what is now 15,000 rounds of .223. Yes, dispite all the BS posted on the internet, I decided to base my decision on real world, personal experience. Second, it was almost half the cost of any other ammo I could get. Third, I am a handloader, but at these classes I don't pick up my brass: since I don't want Wolf cases anyway, it is no loss. Fourth, Wolf provided all the performance I needed for a carbine class: total reliability and more than enough accuracy for combat type drills (these classes are not benchrest matches).
I showed up at that first class and immediately got a lecture from the instructors. I chose to ignore their advice. At the end of four days I had experienced zero malfunctions, shot the highest score in the class by a wide margin on the final skills test, and won the man on man shoot off. I was able to hit a pepper popper six out of 10 times at 400 yards from prone using an Aimpoint during the class.
The last class I took didn't go as good as that one did. I had allowed my skills to deteriorate drastically though lack of practice and training. My score was middle of the road at best and at 200 yards I don't think I put a round in the "A" zone throughout the whole class. But, I again, had zero malfunctions and this time I didn't clean the rifle for the duration of the class.
Tomorrow, I will be on the line using Wolf and KNOW that I will get a good quality training experience.
I am not good with money. I spend it as fast as I get it. I have no problem buying guns, ammo, NFA stuff, tax stamps, training or whatever: cost is almost always not an issue. But, that being said, I see no reason to spend twice as much for ammo when the cheaper ammo does everything I need to perform at my best for the task at hand.
That being said, I wouldn't take any class with any ammo that I hadn't personally tested through my gun as extensively as possible. You definitely don't want to get to any formal class with equipment that doesn't work. You will have wasted your time and money as well as the time of the instuctors and the rest of the class. You owe it to yourself and the class to make sure your gear will run. Now, shit happens, people experience problems in classes: that is one of the cool things about clases, they wring out your gear. But, you shouldn't have problems as basic as ammo not working in your gun: that should be sorted out long before the class. And, you can't do that by just buying something based on internet advice: you need to buy and test to make sure you are good to go.