The star phantoms from the Badab war seem to fit the bill for you
http://wh40k.lexicanum.com/wiki/Star_Phantoms#.USZJrFca6_I
"The Star Phantoms broadly conform to the standards laid down in the Codex Astartes, but have displayed a marked preference for first strike tactics, exemplified by drop pod assaults. The Chapter also seemed to prefer long-ranged bombardment using heavy weaponry over the chaos of melee combat, though it is capable of the latter when it is tactically expedient to do so. For the battle-brothers of the Chapter no one mode of combat holds more glory than the other; all that matters is that their enemy is disposed of.
Instead of having two Devastator Squads per Battle Company as per Codex norm, the Star Phantoms instead have three. These warriors have gained a reputation for being indiscriminate in their use of the firepower at their disposal, inflicting massive collateral damage, to the point where the Lord Solar Macharius himself is said to have stated that the Chapter was "Unsuitable for tactical close support of other Imperial Units".[2h]
The Chapter's armoury maintains an abundance of Plasma and Melta-based weaponry, and indeed it is a mark of honour among the Chapter's leaders to go into battle using a combi-plasma or combi-melta wrought by the Chapter's Techmarines."