From everything I've heard, Segal can, indeed, shoot. From what I gather, it's the uncommon combination of physical coordination, mental determination to practice, and an honest love of shooting as a pastime.
I've also heard Segal has a massive ego and carries a large chip on his shoulder. This part, from what I've been told, comes from his having been a white boy running an Aikido dojo in the heart of downtown Japan somewhere.
He is, from what I've heard, strongly pro-gun and pro-self defense, but keeps it under wraps, so to speak, so as not to hurt his chances of landing another movie.
I also read a story about that idiot movie he made up in Alaska. Seems he's highly claustrophobic. To the point of not being able to put on a traditional Eskimo jacket- which is pulled over one's head like a sweatshirt. Segal had to have his coats tailored with hidden zippers so he could put it on normally.
I hear Bruce Willis, Shwarzennegger, Stallone and others are also very pro-gun, but again, don't make a huge deal of it since the guys who pay to have the movies made are predominantly liberal wimps.
Which brings the hypocrisy of anti-gun moguls making money off sometimes-anti-gun actors shooting guns.... Go fig.
Shwarzennegger once mentioned in a magazine article that he likes to plink and shoot, though he's not big on hunting. He also like to take "live" versions of "prop" guns to the range and shoot live ammo, to get a better feel of how they're supposed to work, look and feel on set.
And my last tidbit on actors and guns; Wesley Snipes is a little guy! It's obvious once you know what to look for... I finally noticed it in "Demolition Man", when he ran into the old fart in white, the "mayor" of that city. You see a closeup of Snipes ("Simon Phoenix") trying to pull the trigger on a pistol, but his "mental conditioning" is preventing it.
Look close- that's a 3916LS "LadySmith". A dinky compact S&W 9mm... I had one, the non-LadySmith version... I can almost hide it completely by palming it with both hands.
In Snipes' hands, it looks like a Commander-size pistol would in my hands.
That's why you see him "Padded" in so many movies... Passenger 57 he always wore a leather bomber-type jacket. In Demo Man he had that ludicrous "armor" made of old 3-wheeler tires... In Blade he had all that "bulletproof vest" nonsense...
Okay, I digressed a bit.