This particular reloading manual covers all kinds of buckshot reloading. It not hard to roll your own buckshot if you have a reloading press..
I do all the stages on the press as possible and then add the buckshot to the shot cup manually..Doesn't take long and you have a box of 25 # 4 buckshot for all predators...Remember # 4 buckshot does not come in 20 gauge in factory loads... However if you reload you can reload any size buckshot you want... Lead, Nickel plated etc...
http://www.ballisticproducts.com/Buckshot-Loading-Manual-3rd-ed/productinfo/00MBUCK/
