system
Given the following post, respond as if you're commenting on Reddit:
human
[40K] Are there any Space Marine chapters that specialize in ranged combat?

Most Space Marine units/traditions lean toward either close combat, with the heroes and leaders having swords or other melee weapons, or fast attack, with the signature units having bikes, jump packs or some other fast vehicle. Or occasionally in fluff some kind of intel or unconventional warfare specialty.

I know a big part of being a Space Marine in the first place is that you don't *have* to shoot all the time because you can survive up close, but humor me. Surely there's at least *one* Space Marine chapter somewhere that focuses on guns first. Where the most awesome and unique unit carries a sniper rifle or beam weapon instead of a special sword or lightning claws.

Tried looking this up on 40K game boards, but any simple answers were drowned in gameplay concerns like points/dollar ratio and "just play Guard/Tau instead" comments. So I come to you.
gpt
The Imperial Fists are siege masters, adept at fortifying and destroying said fortifications. They make extensive use of heavy ordinance, such as Whirlwind battle tanks and Vindicators, and typically rely heavily on their Devistator squads. 

The Salamanders are heavily focused on mid ranged combat, making extensive use of flamers and melta weapons. They don't make particular use of assault units in compensation, but prefer to just incinerate their enemies from a distance.

The Iron Hands love expressing their superiority through firepower. Again, while they do HAVE Assault Squads, they would much rather just annihilate the foe through ordinance, such as Lascannon and Plasma Cannons.