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Yes 1 1/8 of shot is just weight no matter the shot size.
Cutting open a factory shell will give you some information on the wad used and shot weight. But that is about it. Powder in factory shells is a blend that is not sold to the public. It may look like something we load with like Green Dot, or WST but it is mixed by the batch (think bulk railroad car) and weighed out by burn rate. So anything you find as far as powder in a factory shell will not apply to anything you can buy.
If you are starting out and want some light 12ga 1145fps loads for clay shooting the Remington STS hulls are easy loading and can be used several times. The WWB you have are not optimal to reload as they definitely have a steel head and likely have a paper base wad.
You will find Hodgdon Clays (not Universal Clays, or International Clays) is very versatile and works with a variety of primer, wad, and shot weight combinations. Again get the Lyman manual, and a powder scale. I would also look for a local reloader buddy to help you get started.
This is one of my favorite 12 ga. Remington STS Clays loads:
Lead Shot 1 1/8 oz. Clays Powder Win. 209 Primer WAA12 Wad 17.3 Powder Charge Wt. 9,700 PSI 1145 FPS
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