I personally hate shotguns, my tactic, and i know some people would have me hanged for this, is keeping reserved and sniping. If im going try hard its normally something like a mida and a yasmin, mida is effective in most cases. Yasmin has nice aim assist and is a good overall sniper. I would recommend something like it, thousand yard, or weylorans. Sometimes ill use the hawksaw, given that the meta is kinda leaning towards the multitool right now. That leads to trades a lot, which i dont like. So yea, I would say play reservedly and dont put yourself out in the open. Always make sure you have cover nearby.