While not 'currently available', Alliant 20/28 is widely considered the most popular choice for powder. Many of us foresaw the supply issues, purportedly associated with the war in Ukraine, and stocked up.
Winchester 572 can be substituted, in approximately the same amount. I'm pretty satisfied with 14.5grs of 20/28. Winchester 572 is a bit dirty, especially when compared to 20/28.
I have 28s in 2.5" and 2.75", so I load only 2.5". My wad of choice, and I've tried lots of them, is the old Fiocchi RO-28, for 3/4oz, now sold by BPI simply as RO-28.
You'll need to trim your hulls a bit when Roll crimping. Tested pressure are, on average, around 500psi less when roll crimped.
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