Any of y’all have any experience shooting subsonic ammo in the 200 grain range at pigs? Is it effective or does it lack energy to kill? Thanks

It will kill, just need to keep your shots fairly close and don't expect them to drop dead in their tracks from a heart/lung shot.

Keep shots under 100 yards and aim for the medulla oblongata.

Placement. Hit em in the brain or the spine where the neck joins the head. Know your range to target and drop with what round you are using. Subs have a wicked arc even over short range.