I agree with previous comments...a moose call (cone) is not a necessity. I, too, have had a bull or two come to the sound of my chainsaw when I was cutting firewood (not on a hunt).
That said, I always have something with me to use to scrape and call...for a few years I used to cut the bottom out of an oil jug. However, I bought a Bull-Magnet decades ago and it is always with me. It helps project my calls much further out...I've called bulls to me that were at least a mile out. I also get better nasal tone with it when cow calling. I've even turned approaching bulls a couple times by changing the direction that I called.
The only down-side to a Bull-Magnet is that it's bulky to pack, but I don't care...it's been way worth it. The image below shows the wear of many years (and it's going out again in September)...
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Moose Calls, Moose Hunting Videos. The Original BULL MAGNET® by Alaska Remote Guide Service.
alaskaremote.com
Note. I have neither financial gain nor social connection with the above link.