That's a great deal you got there. I bought a case several years ago for my 2 1/2" chambered 20s. IIRC at the time when speaking with their Canadian distributor he said they were 6200 psi pressure. Gentle recoil even with a light gun. The boxes they are packaged in are so fragile and will probably fall apart right away.
edit. I just took a closer look at yours and they are a bit different than what I have. Mine are 24 gram rather than 28 gram loads so the pressures would be different.
I also use the 16 ga 2.5" gamebore. They are a bit sharper in the recoil and pressures.
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