your right about that, i too have raised domestic Hogs.
big weight difference, even when there Lenght and Heights are the same.
when they are Visualy identical... The wild ones weight 30-40% less.. or 2/3 as you said.
the HUGE Domestic Hogs, that weight 450lbs..
when you see a Huge Wild One, That looks to be the size of those domestic guys, will weight 250 - 300.
if you look at my picture at the very top of this posts... that was a Monster Boar.. and he weighed 170lbs once he was Gutted.
and the other big boar, a few columns down from the top 1.. he was 150 or 160 dressed out i belive.

I guess i have never heard of people weighing animals before they are gutted but i guess it is done quite often.
i always have them gutted way before i get anywhere near a Scale..
i usually Gut them on the spot, even if there under a Deer Feeder.

People say they are hard to kill and trap, and you have to be careful with your scent..
and Move the location of your traps..
and they say when you kill them inside the trap the other will smell it and wont go in.

I have always gutted deer and hogs right out in the open, even under the feeder.
sometimes i might drag them 15 feet away from the feeder.
and ALWAYS the guts are all gone by the next morning and there is deer and hogs eating under the same feeder the next morning.

of course Coyotes and Cats come eat the Guts... but Actually 90% of the time.
i think the Guts completly dissapear by Buzzards and other Hogs way before a Coyote or Cat gets to them.