I will not list a powder charge or bushing. But go to your manuals and select a light 1100-1200 fps 3/4 oz load that uses a relatively fast 28 ga powder. This means Unique or Universal. Believe it or not, there are some Green Dot loads out there - and that's my personal preference. Whatever.......
Use the selected 3/4 oz powder charge as a starting point. Or you can drop the charge about 1/2 grain. Load 5/8 oz #8.5s or #9s. Following shot drop place a couple kernels of puffed rice on top of the shot column. Alternatively, I've used 1/2 a packing peanut (for the less environmentally conscious). You may need to lower the crimp start and raise the crimp to get nice closure with minimal dishing.
A safe powder charge for 3/4 shot will be safe with 5/8 oz. But consistency is something else. I always use a chronograph to verify that loads are reasonably consistent.
The 5/8 oz 28 is a very nice load. I load 5/8 oz 20s as well.
Sam
