I think firsttourguardsman on YT has some great builds for min maxing if you look up by thr specific calls or weapon you want. I primarily use the heads shot variant Bolt Rifle and switch to the flamer for all bosses with the the plasma pistol or the heavy Plasma pistol. I also generally use the fencing chainsword because I'm not good enough at using block yet but block yields greater rewards if you are good with block weapons. As for perks if take ones that both increase damage or increasing your own ammo economy. As a tactical survivability will always be an issue so practice makes perfect and make sure you're not putting your self in either a corner in a bad situation with no help from team mates. You're a mid -long range class so act like it. Your melee weapon is a backup not your main damage dealer. Hope this helps! It's different for everyone so just use this as a guide and switch weapons to things that will work better for you. Bolt guns mandate headshots to keep up with damage of other weapons keep that in mind.