WW Xtra Lite 1oz load is about 7400psi.
Loving to play "Damascus and Twist Roulette" I will shoot any 12 gauge off the shelf that is 1oz or less at 1200 fps or less. When I reload I keep it under 8000psi.
I am not sure about todays loads, but modest Italian shells as described above were kept at lower pressures out of deference to the many old guns still in use.
Harry
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