I've sent this in before but I'm just going to post it here. As someone who considers himself a gunning enthusiast and intimate with the numbers - this is how I look at Loch.
LochnagarPrimarily use: 
Arming time reductionSecondary uses: High risk burst damage, jitter reduction
Guns with arming time:
- Lumberjack
 - H.Flak
 - Hades
 - L.Flak
 - Mine Launcher
 - Flare
 
Notable mention: H.Carro (used for jitter reduction and burst damage)
Proposal:- Clip Size: -50% (previously -60%)
 - Rate of Fire: -50% (added)
 - AoE, Arming Time, Rotation Speed, Recoil, Damage, Self Damage: same as before
 
Rationale:- Clip Size change (50% instead of 60%) allows it to be much more viable on Hades and L.Flak, both of which have Arming Time.
 - Rate of Fire change (50% reduction) allows it to fill its niche as a burst ammo type. This fixes all the broken DPS values.
 
The end result - you get an ammo type that is viable on all the guns mentioned above, but still fun to play with on other guns.