All I can say Is wow, just wow, to those of you who suggest multiple rapid Mag dumps do no harm to a BBL.
Think of it this way, it's kinda like hearing loss, you can go to the range without ear pro or a rock concert or 2 and think, "wow, I hear just as good as I ever did, loud noises must not do any damage". But you would also be wrong. It's the cumulative effect.
It's a simple fact that as you heat up a BBl, the hotter it gets, the BBl wears more with each shot.
Now with that being said, there is a difference between doing it with a rifle that is expected to shoot 3 MOA (about what the Military expects from an M4 type weapon) at 100 and one that you want to shoot 1/2 MOA at the same distance. If the OP's coyote carbine is his hunting rifle and he wants to keep optimum accuracy for the long term, I would suggest he refrain from 30 rnd Mag Dumps just to "see how it will group". An AR BBL can hold 3 MOA for many thousands and even 10's of thousands of rounds. OTOH I've seen BBLs with visible damage to the throat and BBL with round counts in the hundreds. Your typical Varmint rig (which is what the op's gun is) owner will not be happy with 3 inch groups, even though that would be plenty accurate enough to "qualify" with.
Tell ya what OP, I've got one set up that will never wear a scope and never be shot for groups at 200 yards, you can dump a mag through that one.
Ricky