The opening of #11 caps that are pinched are not uniform and may or may not get hung up in a capper.
Sometimes their lip will fold over when the attempt is made to slip them onto the nipple.
It's probably best to try the #10's and if they fit too snug then the nipples can be dressed down a tad so that they will fit just right.
They can be dressed by hand by carefully honing them with fine sand paper or a another polishing media.
Then consider buying new nipples afterward if you're not happy with the results.
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