I've a bud that shoots them in both 12 & 16ga. [break open guns] at sporty clays w/good success. I get the once fired hulls, reload them perhaps twice and toss them. They are Cheddite hulls w/steel washed heads undistinguished from the Clever Mirage T 1 headed target hulls internally in 12ga. and I've zero issues w/reloading them or their ejecting or extracting afterwards in 12ga. semi-autos. I don't have but break open guns in 16ga., but have experienced no issues there either . I use a MEC 600 Jr. much of the time or VersaMEC as a time killer, so the hulls are getting resized by a ring, not a collet. The MEC collet sizers are adjustable, though many people don't seem to know that, so their reloaded ammo is sometimes not fully sized back down to the original SAAMI spec.
