I've been using the components Jim talks about for years but within the last 2 years I've switched from Clays to Clay Dot due to it being a little cheaper.
If you look at the Alliant web site for a 1oz load, you'll notice that load using Clay Dot, produces 5,850psi. Checking the Hodgdon's web site, the same load produces 7.700psi. A difference of almost 1,000psi. This data is for the Gold Medal Plastic hull but I would think substituting a Top Gun or Estate hull would be similar.
Since Alliant says Clay Dot is similar to Clay's, I e-mailed Alliant to make sure their data was correct per the psi. According to their reply, the data is correct.
I usually stay at 17.5 grains of Clay Dot in the Estate hull whether or not I use 1oz or 7/8oz of shot however in the winter I stay with 1oz due to incomplete burning and some off sounding loads when using 7/8 oz in real cold weather
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