Schoolboy
If you have that one box, then buy the first 2 mentioned, and skip the light mags for right now. ANd then when you get to the range if you spy someone with ammo of something different, go over and start a chat. Ask to buy 3 rounds just to see. You may get them free but I'd happily help my neighbor out to test other ammo any day. And worst case the 3 rounds shouldn't be much over 3 bucks anyway.

Its a pretty friendly world with shooters, at least the ones I know, and most will help. It'll save you some money.

Now once upon a time I thought there was someone coming up with a sample pack deal of 5 of each blabla bla..... don't recall anymore than that though.

Best, Jeff