What kind of 5.56 ammo are you guys using to train with? (Carbine Courses)

[Razorhunter]

What do you guys prefer to use?
I just cannot afford to shoot as many rounds as so many of you on this forum do, and when I buy ammo, I usually just try to stock up on something other than 55gr lightweight practice/plinking ammo.
I wondered if most of you guys who shoot hundreds/thousands of rounds each week/month, are using 55gr M193, OR are you guys shooting something else?
Does anyone here shoot 75/77gr stuff by the thousands? Is there even a 75/77gr round out there, which is less than $1 each, and somewhat more affordable, that it could be used to train with?
I've always wondered what I should buy to train with, if I were to take another carbine course? Last course I took, (and the only course I've ever taken), I used some ammo that was given to me.
Just wondering what would be the best ammo to use for a training course?
Do you guys usually just shoot the CHEAPEST, QUALITY ammo you can find (most likely XM193???)
Thanks guys.

[Sidewinder6]

Running Remmington .223 in 55gr for range and classes. Running 68gr if I care about groups or accuracy. Ive been getting mine from Georgia Arms. They are fairly painless to work with.

[Cold Zero]

I use for training Win' White box, Q3131 55 gr. FMJ. It works fine for me. I loaded up on it when it was still way cheap.

[Robb Jensen]

I've used M855, XM193, AE223, & Guatamalan.

[jh1]

I've used M855, XM193, AE223, & Guatamalan.

Who do u buy ammo from?

[RWK]

I'm in the "cheapest, quality" crowd. That being PRVI Partizan M193.

[DocGKR]

Whatever we get for free...usually 55 gr Win or Fed FMJ or the 64 gr Win JSP on the state contract.

[PRGGodfather]

Federal XM193A from San Diego Police Equipment

900 round case in stripper clips

[Robb Jensen]

Who do u buy ammo from?

The vast majority of the ammo I use I buy from my employer.

[markm]

Reloads all the way. I've never ran factory ammo in a class.