In .177, the Vulcan 3 do shoot slugs, but not as good as my maverick at the same distance, i usually say the Vulcan 3 can hang with the Maverick, and it do, but it is at the hells of the Maverick, and i am sure opening up over the 80 - 86 M the Vulcan 3 will drop like a hammer.
Mind you i have not spent as much time dialing on the Vulcan 3 as i have the Maverick,,,, not even close, actually in comparison it would be a insult to the Vulcan 3 as in that regard i have barely touched the V3, i have spent that many hours on the Mavericks knobs.
BUT ! in other larger calibers where you can get a longer barrel the Vulcan 3 seem even better.
Krale do not send me things like that unless i have posted a substantial wad of bille in their direction

But really so far i have not dropped big money in their shop, maybe that is the problem.
PS: i see someone now sell the 10 gr JSB KO MK3 slugs, i am thinking trying those in my Vulcan 3, maybe dial for those, and be lucky 10.3 and 13.4gr pellets will be happy at the same setting.