The Spanish Mackerel you see in the vid is Scomberomorus commerson http://www.fishbase.org/summary/Speciessummary.php?id=121 not the same as our little Scomberomorous maculatus http://indian-river.fl.us/fishing/fish/mackspan.html Although similar hunting styles may work for both fish.
Now I know where you got the idea that you need a 130cm gun to take them Brian. I have good success with mackerels, always with solid mid body shots, a 110-115cm gun does just fine.
I agree with the above. You could do alot with a smaller gun. I use a riffe x3s or something I forget what they're called. From bluewater to shoredives.
Now I have taken my seasniper 130 enclosed track on a fee shore dives and hated life. 130 is just way to long when you could get somewhat near the fish in our waters in SoFL.