I have a 3.5" 2 oz load at 1250 that I made from Hal's first 3" recipe. I added cushion and sped it up, foolishly thinking that was necessary to make it really effective. Its not.

Now Hal has a 3" recipe that is better than my 3.5"; same amount of shot and even more velocity from a 3" hull.

I have often argued for the advantage of the 3.5" hull in the lead days, and still would, but with tss the shell length makes no difference. I still use my 3.5" recipe in the 12 gauge simply because I have a bunch of components for that load and I suspect they will outlast me.

All the labor of man is for his mouth, and yet the appetite is not filled.