I did the same with a Clever Mirage 1oz 1220 fps, RIO 1oz 1280fps, and Estate 1oz 1235fps. I did this mainly because the Clever shells shoot so soft, so I wanted to see why
The Clever has 427.8 gr #8 shot, wad was 42.4 gr, and it had 16.9 gr of a square cut powder. The RIO had 428.2 gr of #8 shot, wad was 40.2 gr, and the powder was 20.6 gr. The Estate had 433.4 gr of shot, wad was 37.2 gr, and the powder was 16.2 gr.
I expected the wad in the Clever to weigh the least, yet it was the heaviest. Look at how much larger the Estate shot is! All are suppose to be #8's. I should have measured it but didn't. The Clever are soft shooting, and well known among Sporting clays shooters. Trap, not so much. The wad design of the clever, and the combination of the powder make for a very soft shooting shell. Their T2 1280fps load is a pleasure to shoot too.