"Triggered" due to a discord comment claiming RAC Bushwackers with XL are squishy. Keep on moving, keep on firing, don't face tank huge mechs if you can't land the first shots before he fires back at you. Don't forget that this mech has +10% ballistic range, so the base optimal range is 495 meters, you don't have to hug your target. About skills, get most armor nodes, heat gen, range and some mobility. Projectile velocity and operations could be handy, as well as radar deprivation and seismic sensors (ignore cooldown). I'll have to rebuild and use this mech this evening. P.S.: I'm kidding about being triggered. This mech maybe it's not really easy to use, but in the right hands it packs a good punch.
Alternative with LE250 and TC1, runs a bit slower and 1 less tonnes of ammo. Have 950 ammo with 1 node, didn't go for both. It becomes somewhat easier to use and take into endgame, as you can afford to lose a torso in said stages, where you might be the most armored mech left.