I'm looking at buying a Smith & Wesson 638 SC off the Equipment Exchange.

It's a 357 airlite / mountain lite with a 3" barrel.

What should I anticipate the double action trigger pull to be like?

DA trigger pull will be a lot less aggravating than the recoil.

Triggers on the J frames are typically not as good as their larger brothers.  The smaller mass of the parts generally requires a stronger hammer spring to get reliable ignition.  Nor do the J frames lend themselves to trigger jobs like the K, L, or N.  

Enjoy the gun for what it is, point and shoot defensive pistol and not a target grade revolver or everyday plinker.   And yes, the 357 airlite can be a gruesome shooting experience with full house loads.

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Quoted: I'm looking at buying a Smith & Wesson 638 SC off the Equipment Exchange. It's a 357 airlite / mountain lite with a 3" barrel. What should I anticipate the double action trigger pull to be like?

Expect a heavy trigger pull and a very snappy recoil.  

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Quoted: height=8 Quoted: I'm looking at buying a Smith & Wesson 638 SC off the Equipment Exchange. It's a 357 airlite / mountain lite with a 3" barrel. What should I anticipate the double action trigger pull to be like? Expect a heavy trigger pull and a very snappy recoil.

Trigger pull was much better than expected but recoil was a bit more than I expected!!   Ouch!!  

Shot 20 rounds of American Eagle 158gr soft points.  I started flinching so I decided to call it a day and will get some 38s to practice with.