Hi, a few years ago I bought a number of the 12 ga Pure Gold here in Canada, and on a rainy day, opened a few to count and measure the pellets. Here's the info from my notes;
Pure Gold, paper case (12ga)
65mm (2 1/2")
Fibre wad
1295ft/sec. 6526psi
28gm (1oz) (28.6gm),
#6 shot (258 pellets, .103"-.109) "diamond shot"
ft/sec
28gm (1oz) (28.8gm),
#7 shot (311 pellets .096"-.102")
"Diamond shot"
1325 ft/sec
G1225TG28-7
-----------------
Super Game High Birds, plastic case (12ga)
65mm (2 1/2")
Plastic wad
30gm (1 1/16oz)(30.2gm),
#6 shot (293 pellets .101"-.106")
1350 ft/sec
Hope this helps!
