The range of shotgun isn't the problem, honestly its pretty ridiculous that the bullets just disappear at a certain distance (especially the slug on the chaperone, but that is another post entirely). The only thing that will fix shotguns is to remove OHK body shot at any range. It is ridiculous that a shotgun can consistently OHK a sword (sword has armor buff) when the sword is a heavy weapon melee attack. Shotguns deserve a little range, it is a GUN. but the one shot at any range is ridiculous. I think a body shot in the effective range should nearly kill you but always require an extra shot or melee (the same way the chaperone requires two body shots) The makes rate of fire relevant, which currently based on everyone in Iron Banner using the conspiracy theory D it clearly isn't relevant at the moment.
TL;DR Shotgun shouldn't have range nerved (again), they should have damage reduce in PVP so they no longer OHK.
Edit: I am reffering to body shots in this entire post, I am against OHK for non precision body shots in PVP.
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Which is exactly why they're making a dozen other changes. Very good.