I've been searching for 12 pellet #1 buckshot load or a starting point with 1oz or 1 1/18 buffered lead loads. I have the BPI Advantages and Buckshot manual but there are only two loads with buffer neither will help. Is there a manual out there that has better information or data??

Consider pay load amount. Buffer if you want longer range loads. BB, 0 Buckshot, #2, #4 copper, #4 buck, 1 Buck, oo, pay load is pay load. I started loading buckshot in the early 80's for Predator hunting. Loaded for dove, quail, ducks, geese from the 60's.

Go to You Tube, type in Bubba Roundtree Outdoors, Wade is a wizzard on loading buck shot, buck and ball as they run deer with dogs in the lower part of the state of SC using buckshot only. He has some great loads on 2 3/4 oz buckshot, all sizes including T, F buck for predators.

For your 1 1/8 oz pay load, 19.6g of 700x in a Remington Club hull is excellent, 1200 fps.