A lot of guys at our club reload them many times. I have only seen once where someone had a separation problem and I believe that was because he was using AA style wads instead of a federal clone. The federal top guns are a straight walled case and you have to use a straight walled wad like federal or you will get too much powder burn up the side of the case making the case walls week causing the problem of separation.
Good catch. Estates with the plastic base wad were manufactured by Cheddite. After Federal bought the Estate brand several years ago, the base wad was changed to the cardboard (actually wound paper) version.
I haven't seen an old Cheddite made Estate for some time but we shouldn't assume data is interchangable between the two.