Hodgdon's load data site shows a variety of loads. Quite a few of the guys at our range use it with great results. We like it more for one ounce stuff. The price is very competitive.
Perfect Pattern is best with 7/8 and 1 oz 12 gauge loads. For 1oz to 1-1/8oz High Gun is a better option.
Depends on the powder. Plenty of people run common ones Unique, Universal, Green Dot, etc. for 1-1/8 oz loads with no issues if the data is published for it. Just stick to a tested recipe from a reliable manual and you’ll be fine.