Question on TSS #9 20 gauge

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I have been hunting with Fed. TSS #9 20gauge PTSSX259F9 yellow in color and I really like the performance of these. Now I am seeing the same load except the velocity is 1200 FPS versus 1100 FPS.
The shells are red in color and normally sell $2.-$3. Less. My question is what is the difference other than price an velocity.( Please disregard I was wrong I was looking at 12 gauge)

[Terry]

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If they're red in color I doubt they're 20 gauge. All 20 shells are yellow

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 Sorry I was wrong my mistake. I was looking at 12 gauge