Underboat, limped pot, line check.

I get on SB. 3 opponents including BB. Unraised pot.

Board

Pot=4BB

Stacks around 100BB each.
I lead for 12BB, button raises to 30BB and I push.

Standard? Overbet g00t?

Insta push for me. I would figure the villain came in with A 7s and sees the trips as his ticket out.

He's ready to stack off. Pooooshh!!!

My only concern is that a push doesn't give him a chance to put in more money with really weak hands. Although that depends on the stake, etc.

We're certainly felting this. All-in is one way to go, but I don't think it's the only reasonable line here. There also is value in mixing this up.

Call, check/raise a/i?

I like the push, a turn diamond might make him not put his stack in with whatever he has (I'm guessing A7 or some overpair, which he is going to call a flop push with if he's put this much money in already).

Edit: I don't think I like the overbet lead, though. Most times you'll just pick up the 4BBs. I prefer to lead for pot and hope some jackass wants to draw to a flush and stack off vs your "7x".

This is one of the rare times I'd minraise.

You almost certainly have him completely crushed here. A straight push might make him back off of his 7x (since who knows what he has on the button).

A minraise gives him what, better than 3:1 on just a call? Good. I want him hitting his flush if he just calls, and most aggressive players not on a flush with a hand will push this and get stacked just the same.

Although $50NL is a bit tighter than $25NL, I still often kick myself in the butt after I catch someone with strong second best and let them go off the hook by merciful moderate v-bets or something.

Results:
He thought a bit and called. J7s no good, turn and river no help.