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Gee, that would be great
The problem is that the data could well be inaccurate tomorrow as the makers change components. And the U.S. makers decline to share the infro.
But ed will ask again in a few weeks






SAAMI rules
Load weight variations can range from +4% to -7% in game loads and +3% to -5% in target loads; about +/- 1/8 oz. of variation allowed per shell.

Pellet counts per ounce can vary by +/- 10% for both game and target loads.

Load velocity can vary by +/- 90 fps for both game and target loads.

Load pressure - only specifies maximum average pressure for 2 3/4" and 3” shotgun shells will be 11,500 PSI +/- 900 psi, with some maximum extreme variability not to exceed an uber-max of 12,500 psi +/-900 psi
It MIGHT be assumed that loads in general do not vary more than 900 psi, and for low pressure loads likely less