Ideally you want aggressive ballistics and smart drift control. Rodeo. Field scout. Crowd control. switching between those barrels depending on the map. from what I've noticed controlling the hammer's side to side recoil is much harder than vertical. Rodeo is the one that helps with side to side control along with overall stability. That gun is powerful enough it kills anyone with 3 headshots or four body shots. That's also a very hard roll to get. I've spent about a hundred and fifty motes on two Hammers and still don't have a perfect one. if you have at least 60 motes I would say reroll. If you are down to 20 keep what you have. It's been my experience that it may take you quite a while to get something good. The last Hammer I just got a few hours ago has aggressive ballistics, persistence, field scout, crowd control and I'm not rerolling it even though I really like having rodeo for PvP. I just don't have the motes to try it right now. I figure I have three and one of them is pretty good for pvp. The other two I shoot aliens with