Personally I hate the LBX. Its on paper damage looks great. Outside of 50 meters though you miss a fair few pellets so the damage is artificial. Same holds true for SRM's but to a much lesser degree than the LBX.
The biggest weakness I find with the Atlas is its torso turn speed and manuverability. It is a giant target if you ever run into a open field battle without much option for escapes. For that reason I like to have a few longer range weapons that are still effective up close (large lasers/gauss rifle). I also run a 325 std engine for the added torso twist speed and better turning rate.
Here is a setup that is pretty sound for me:
Engine: 325STD
Heat Sinks: Single
Structure: Endo
LA: Large Laser
RA: Large Laser
LT: 2X SRM6's with Artemis (Artemis keeps the spread tighter and allows effective range to 280m) with 2 tons of ammo in CT
RT: Gauss rifle with a CASE (it does ocassionally blow up) with 2 tons of ammo
Large lasers are some of the best damage for crit slots out there and provide 18 pin point damage being on arms. Gauss is a range monster and 15 damage up close. SRM6's are great for killing CT's and hit well out to 280m with artemis. YOu drop the leg armor to 81 and rest of the weight is spent on heat sinks with a heat scale of 1.17 if alphaing.
If you are really hell bent on using both ballistic slots, UAC5's are tremendious damage with good range. You will have to deal with additional heat and jamming though. To fit it drop the arms to Medium lasers (I would do medium pulse lasers to deal with the lights). Run three tons of UAC5 ammo and ditch the CASE. Leg armor to 74 to fit it.
Pick up artemis either way if you are running SRM's or LRM's. It makes a noticeable difference. You could also change from SRM's to LRM's and run a TAG in the CT. One of my fits is a LRM20 and LRM15 in the LT with a Gauss and 2X MPL's. You will need DHS to run it effectively.
Edited by Derric Willhelm, 22 December 2012 - 07:37 AM.