So for whatever reason the majority of legendary weapon drops I have been getting in the game are 10mm pistols. I think I got my 10th Wounding 10mm pistol a few days ago fighting a legendary deathclaw. I dropped the weapon into my legendary collection box and for the hell of I decided to look through what I have accumulated thus far.

I noticed I do not have a Furious 10mm pistol. The only "Furious" weapons I have are melee weapons. Is "Furious" limited to only melee weapons?

Yes

http://fallout.wikia.com/wiki/Legendary_weapon_effects

Where did you gut this gun

The Wounding 10mm pistol?

Legendary item are randomly generated when a legendary enemy spawns. But there are specific legendary enemies in the game that drop a specific legendary item like the Behemoth Swan over at Sawn's Lake that drops the Furious Power Fist.

I know where I defeated the legendary alpha deathclaw that gave me the Wounding 10mm Pistol, but I don't remember the name of the location. It is on a rooftop where either a legendary alpha deathclaw or a normal matriarch deathclaw would climb on to the roof and attack you.

Getting a legendary 10mm pistol from a legendary deathclaw was a big disappointment since I have gotten many of these weapons from low level legendary ghouls.

At least you get weapons. I never get weapons only metal, leather or combat armor. My two characters already have their endgame armors and all I keep getting are arms and legs. I gotta irradiated combat rifle yesterday for the character that uses the two shot combat rifle I threw my hands up in the air. The one gun I have legendary is the only one I find? I'll take a cool 10mm pistol please haha. I get knuckles a lot though so there's that