8 # jug of Unique got me through the powder shortage few years ago. Went back to 20/28 for 20 G loads after . Recently running out of 20/28 pulled the Unique jug out for 3/4 oz shells.
I like it better than 20/28 for straight wall cases like Remington STS & Gun Clubs & 3/4 oz using the Claybuster 3/4 wad. It’s bulkier fills the hull and crimps well. Cheddite hull capacity similar to GC expect you will find the same. Might want to call Alliant & confirm. Their on line data has lots of published loads for Remington hulls none for Cheddites.
http://www.alliantpowder.com/reloade...eid=3&gauge=20
Compare 20/28 data with Unique same components 20/28 has lower pressure, either one produces “low” pressure.
William