bangstick really has nothing much to do with bigger is better
(and they are really not killed all that easily with a bangstick either, Florida mostly just doesn't want people shooting rifles and such over water, you know, especially at night)
"Some powerheads use the cartridge to propel a barbed spear point into the target.
These are generally used on a bangstick used for alligator hunting,
to secure a line to the alligator to prevent escape."
but some bow fish to do the same.. and then try to hit 'em with the contact bangstick
this article gives some good insights into the fun factor
http://bowhunting.net/2010/08/gator-season-is-upon-us/
mostly.. you hook 'em FIRST... then the fun begins... and it ain't that easy to kill em from less than "arm's length" with whatever you have in hand, any caliber..
this is not the same as what you see if watching film of a shark hit underwater with a gas expansion bangstick
from aforementioned link article -
"Once you have your gator under control
and you have hit him just behind the eyes with the bang stick the next step is getting his mouth taped shut. Here is where you might need to take another deep breath. You have to reach down and
grab him and hold his mouth shut while your trusting buddy tapes him up. Several wraps with electrical tape will ensure his mouth stays shut. The tremendous closing/biting power of a gator is rated at 2500 lbs per square inch of bite pressure. The majority of jaw muscles in a gator are used for closing however so holding his mouth shut can be done by hand.
Now that you have his mouth taped shut severing his spine is the next step. We usually
use a 1” wide wood chisel and a good hammer. Where the head and neck meet is where you want to place the chisel and give it a few good whacks with the hammer.
Just make sure you break the spinal cord, this will slow his movement down but not all of it. He is still going to move some like a snake or a turtle would but done properly you’ll have him right where you want him in the boat.
sort of gives all new meaning to the phrase "under control" don't it ?
(don't forget the 'duct tape')
None of which is what people discussing "best caliber for gator" (handgun, rifle, or shotgun, or bangstick) probably really have in mind.
(but if you can legal do it like that TV show, pull in the hooked gator, stick that rifle muzzle a few inches away from that brain spot, and pop him in just the right spot with a 22 rimfire, then you can forego the wood chisel and hammer... the trick is the hit... and this ain't horseshoes)
PS
I used to fish the gator holes in Lake Iamonia and lake Miccosukee, some times at night
also have had 'em slip off banks and under my canoe when they didn't hear me coming
if you startle 'em, which you can do in a canoe or kayak, they will do that, but it ain't a 'kayak attack', it's just a tad unnerving
especially one as long as a 17 foot canoe, and yeah, they really do get that big, because when you are that close to 'em in a 17 foot canoe, it's real easy to judge their size
leave the dawg at home, and put your fish in a livewell, not on a stringer... and/or get a bigger boat 'cause a bigger caliber gun ain't going to be all that helpful
but I never had the need to shoot one either