Curious? Would shot size make a difference? I wonder if the same number of hits with say 7.5 have more energy to fracture the target compared with say a #9 shot?
I guess if they're throwing bios, we need to go one choke tighter and use our good eye.![]()
If the shot doesn't crack the target then more rotational spin won't make it break any better, once the crack is started then centrifugal force created by rotation will cause the target to come apart. I think these bio targets are too soft and that's why they will get holed but not cracked, especially by smaller shot. I would only use 7.5 shot for the best chance of getting a crack started in these.
For those interested, there is a 2010 book written by Dr. A C Jones. Took him 7 years of extensive testing and compiling data related to shotguns to produce the book. One interesting observation related to rotational spin, is that because of spin you cannot tell where you hit the target. You may have hit it at the rear edge of its flight but because of its spin, it may actually appear that pieces came off the front. Jones used high speed photography to determine where a hit was actually made and compared this to observations made by experienced shooters. Conclusion, the "experts" telling you the target was hit at the back or front is simply a guess and the human observations were wrong as many times as they were right.
Here are some clays shot at 35 yards Winchester super targets 8s 1 1/8. Multiple strikes on most of them with the most being 8 hits and only a slight crack. Some pellets hit so hard the lead splashed. Targets where hung on a fence IC choke. Of the 5 targets shot only one was broken. Without rotation it is very difficult to break a target.