I am currently working up a load to duplicate the Aguila Mini Slug/Buckshot load. I am using a Maverick 88 12ga with an Op-Sol mini-clip I bought on Amazon. I took apart an Aguila slug and the components are powder, gas seal,and 7/8oz slug. I took a 3/4in pvc pipe and cut it to 1 3/4in to use as a guide to cut hulls.(I think I'm going to reduce length to 1 5/8 cause I'm having to use a 1/8in felt wad right now). I'm using pure lead with a Lee 7/8oz slug and Lee OO buckshot molds. I can load 6 OO buck which is equivalent to the 7/8 oz slug. The Aguila slug chronographed at 927 fps MV, I'm currently getting 950 MV using 12gr Red Dot. I'm going to reduce load to 11.5gr Red Dot and see what I get. Currently I'm using straight walled Euro hulls with a Ballistic Products GS-2 gas seal,1/8in felt wad, and clear plastic overshot card. (I plan on eliminating the 1/8 felt wad when I reduce length of hull to 1 5/8in) I'm roll crimping the hull with a Ballistic Products roll crimper and drill press with the BP Hull Vise. When using published load data for 7/8 oz loads I get around 1300 fps which produces more recoil than I'm looking for. Using the Op-Sol mini-clip I'm getting 100% cycling in the Mossberg 88. Pleas accept my info with caution. It is up to you to develop your own load. What works for me may not work for you!