Also, I should elaborate a bit on what I think is horribly, depressingly wrong with the lochnagar's arming time reduction.
Sniping builds are strong. They can deal insane amounts of damage from a long way away. The arming time on the lumber and heavy flak makes a lot of sense: it means that a brawling team can get up close to a sniping Galleon's broadside and have its effectiveness reduced. That's good. It keeps sniping balanced and gives brawling builds a good chance. With the new lochnagar, there is virtually nothing that a brawling team can do. Stay out? Sure, they'll get pummelled by merc-lumber fire. Get up close? They'll get crushed by merc + loch flak/lumber. That simply isn't right.
Another bit that makes no sense is that charged merc, as of 1.3 testing, does higher DPS than the Gatling. Charged merc does 89.7 armour DPS before the reload (which was shortened, reducing another one of the gat's advantages). Heavy gat does 69. If you switch to any other ammo type, you'll miss a pile of shots, and the DPS will once again be lower than the merc.
Tl;dr: Sniping OP, Gat useless