Unfortunately there are many misconceptions, and many variables with buckshot. Used within its limits, nothing can beat it. If a slug is just as effective... well you probably weren't a very good shotgun shooter to begin with. Buckshot is shot. It is best used with a shotgun with no sights, and is best used in situations with moving targets and or thick cover. Now I'm not advocating shooting sprinting deer, but in the best spots deer rarely stop. Same with thick cover. If you can't see the eyeballs, then you can't positively identify the target. But if you do find yourself in a swamp, or creek bottom with downed trees and brush in every direction, and a deer comes trotting along at a good pace, then buckshot is the best tool for the job. It is not the tool for sitting on the edge of a corn field. It's my opinion that most people do not hunt the heaviest of cover, so most do not understand.
Patterning buckshot is just like shot. You want multiple pellets in the vitals of your deer. I do not advocate head shots, but I do like the idea of the base of the neck, same as shooting turkey. With an adequate pattern you are sure to get some in the neck, some in the lungs, and a good chance of hitting something big enough to drop the animal on the spot. The traditional lung shot works too. I think where people run into trouble is from not patterning their gun, taking a long shot, and only getting a single pellet through the lungs. This wouldn't be good. Put 3-4 pellets in the lungs, and that deer won't be far at all, probably closer than a normal rifle shot.
Since this forum does claim to ban firearms inventions post 1865, I'm not sure I should talk about choke. I do see a lot of mention of jug chokes on this forum though. I'll simply say that choke can have a monumental difference in the tightness of your pattern. Assuming a cylinder bore, you are far more limited. Even with that, the old 1" per yard rule, just throw that out the window. Even in modern shotguns, a poor load could be twice that, and a good load can pattern WAY tighter. Looking at your picture, that's a spread about 12", and you say that is 17 yards. That is not a horrible pattern, but you can tighten that if you wish. There are a ton of variables in your load to mess with.
The shot quality is one easy area. Soft lead makes horrible buckshot. The basic swaged antimony buckshot is ok, but not the best. Some hard swaged shot, like from Ballistic products is pretty good. The very finest buckshot that you can get can only be made. Clip on wheel weights is an ideal alloy, something semi-hard, ideally with some arsenic in it. The key is to drop the shot straight out of the mold into a bucket of ice water. Cold tap water works nearly as well. Alternatively you can oven heat treat the shot later. Doing this significantly hardens the shot, without sacrificing weight, or making them brittle. For example, pure lead is about 5 BHN, swaged buckshot about 12 BHN, BPI super buck about 15 BHN, and heat treated cast shot can be 25 to over 30 BHN. The harder they are, the rounder they stay during firing. Round shot flies straighter.
Buffer is one area I don't see messed with too often in muzzleloaders. Something like cream of wheat should work better than modern plastic buffers with regards to fouling. The trick I've found is to pour your powder in, and ram your over powder wads down first. Then only start another wad, a thin overshot card works well, start it only 3" or so into the barrel. Then you can drop your shot in, making sure it stacks properly. At this point you can pour in buffer, while lightly tapping the barrel, until the shot is covered. You want the buffer in the gaps between the shot, not mixed in, and not underneath. Gentle taps on the side, not on the butt of the gun. Finally add overshot, and ram down fully.
Speaking of stacking, shot size can make a difference. Some stack better than others. I often find stacks of 2's work great. To find, simply divide your bore diameter by 2. I
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