Thank you for your question, code5oupe; it has already led to a modification of our plans for the next experiment (in spring), one which will make it much more interesting.
You wondered what implications our research has for the the wide-spread assertion
“only very tight chokes are suitable for trap work because only they enable "accurate" "target reading"”
Well, I’m going to assume that when you wrote “Target reading” you were thinking of “target break reading.” When we use that term, we have to distinguish between the two types, the ones we defined in that article:
“Strong Target-break-reading (Strong TBR): Guessing at the location of the shot-cloud based on a clay-target’s breaking pattern. Example: “Look at the way the shot drove those pieces down! You are still shooting over them!”
“Weak Target-break-reading (Weak TBR): Using the “quality” of the target’s break to determine if the bird was centered in the pattern or off to some side without reference to which side. Example: “You just barely clipped that one; give yourself a little more time to make the shot.”
We can discount any advantage either choke would have for Strong TBR. It doesn’t work at all, so neither will perform worse, nor better.
Weak TBR is a different process, but rather than just guess, let’s see if we have any data which might lead us to one or the other answer. It won’t be certain, of course, only experiment can give us data to base our answer on. But we can use what we think now to access the odds.
I think it’s reasonable to say that if there are more pellets in the inner 10-circle of the pattern you are more likely to get the shattering break we identify as “dead center” (when we really are dead center) than if there are fewer pellets in that central 10-inch circle.
You have to keep in mind that even with full chokes such as we used in our testing a perfect hit doesn’t always tell us “perfect hit.” In that rising POA video when the targets were straight-aways there were four apparent centered hits, but only two “looked like it.”
And remember the Challenge. There were three centered targets and 3/4 of the players got one of them right (Target #5) , but only about half scored on the other two. So there is quite a bit of uncertainly which may be the break, or the judgement, or both.
So let’s say, for the purposes of seeing where it leads, accept that more pellets in the central 10 inches give greater likelihood that shooters will be right when they think they are “centered.” The corollary is, or course, that this greater accuracy on centered hits will make it more likely that they will be able to tell them from non-centered hits.
And, sure enough, this Carlson Xtra-full choke tube in a Beretta Optima barrel put more #8 pellets in the center from 32 yards. Not as many as some might have thought, 15, but, on the average, more, and so it should work better for Weak TBR.
There’s one caution. Contained in the above phrase “on the average.” And it warns us not to try to separate single breaks as evidence of much, but rather, as a group and quite a bit of shooting.
On the field we don’t experience those relative pellet counts in smooth comparisons, but rather as an unpredictable mix:
The Xtra-full is usually better, but modified is equal (or better) some of the time. Looking at the X-full trace, notice how it is possible to put a lesser pattern on the bird even when your aim is perfect, and if you took the lesser break as evidence that you were a bit off, you might be led to a change which is unwarranted, or maybe worse.
So my guess is yes, if Weak TBR works, then full chokes are likely to improve its accuracy. And based on your suggestion, our Weak TBR Challenge will include both chokes.
It’s the uncertainly the shot-by-shot graph illustrates that lead us in our article to recommend that if Weak TBR is used, it should be applied to a group of shots, not just one.
“Weak TBR may help you monitor your own, or a student’s, performance in practice or in an event. Just keeping informal track of the quality of the breaks, even just using a couple of categories such as “Smoke” or “Not Smoke,” keeps your mind in the game and helps you keep your focus on the trapfield, not on tonight’s dinner or tomorrow at work. Dead-center hits, one after the other, tell you that you are doing fine. Weak hits, one after the other, tell you that you are a bit off and need to pay attention. Maybe you need to lock your eye on the bird even harder or adjust for the wind or something like that. A long history of weak hits may also tell you that your point-of-impact might improve with a bit of tuning, that light-modified really isn’t enough for singles, or that you simply need more practice; this is a tougher game than you realized.”
Neil