The issue is the top of the bottle.
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There are two ridge points on the top.
Clappers that you’re using close around the bottom ridge to give the leverage to push the crown cap around the top ridge.
(Bench presses don’t need that)
So if the second ridge is very close to the first. It simply doesn’t have enough distance to pull the cap on.
I’d be willing to bet that many of your SN bottles you can pry open with your fingers.
Some clappers can flip the part that over to work with the shorter distance between the two ridges.
If you insist on using SN bottles, and your clapper isn’t adjustable. You can get around it by putting your full body weight directly down onto the bottle resting on a solid surface or floor.
But this increases chance that the bottle will break if you’re not pressing straight down.
And every bottle you need to try pressing up against the crown with your thumb. If the cap pops off then you need to try again with a new cap. If you can’t push it off with your fingers, you’re golden.
But… after broken bottles, lost beer, wasted failed caps. I just recycle any bottle with a narrow space between ridges.
If you really want short bottles, there are some brands out there with short bottles and clapper friendly tops. Just double check that they aren’t twist offs.