Help with RST 2 1/2 low pressure loads for 12 gauge

[J.B. Books]

Instead of a Universal Charge Bar I have a "Shuttle Bar" made by the same company. It has an adjustable shot cavity but uses standard MEC powder bushings. I picked it up in the "used" bin at Kittery Trading Post many years ago for $12, I had not heard of them until I found it. It has been very handy for reloading Bismuth shot for my waterfowl loads. They still make them. It does seem to leak a little powder as many here mentioned about the UCB.

http://www.multiscalecharge.com/products_shuttlebar.php