They have brass heads and durable plastic cases that last for quite a few reloads. Winchester AA and Remington STS hulls are the two most common, highest-quality hulls for reloading available today. The Winchester AA hull (referred to as High Strength or “HS” by Winchester) is a three-piece Reifenhauser-type design.It consists of a brass head, an inner tapered base resembling a plastic cup and a straight length of extruded plastic tubing. Even having to stuff the base wad in, it must be exponentially quicker, and thus cheaper to make a reifenhauser hull.Winchester AAHS. Compression formed hulls are injected into a mold one at a time. reifenhauser hulls are created by extruding one long tube and cutting it to length, kinda like making a PVC pipe.There is uncertainty, disorientation and unanswered questions on many topics. The world and the plastics industry are facing major challenges. The AA-HS averages 2.7″ in overall length. It consists of a brass head, an inner tapered base resembling a plastic cup and a straight length of extruded plastic tubing. The Winchester AA hull (referred to as High Strength or “HS” by Winchester) is a three-piece Reifenhauser-type design. They offer a larger volume than tapered hulls and therefore need the wads with wider base diameters made for them. are all straight-walled hulls and use pretty much the same recipes. Federals, Fiocchis, PMCs, Cheddites, etc. Reifenhauser is a plastics molding process which created the first successful plastic hull in a straight-walled tube.Most, if not all, Euro hulls are of the Reifenhauser design (a straight hull with an inserted base-wad in the bottom). In current production (at least in the US) are the Remington hulls and the Federal Gold Medal hulls. The best hulls are one-piece hulls at least you know that they won't come apart.As I recall it is a high volume hull with straight walls.The Federal wads would be a better fit for the Activ hulls but if you have data for Winchester hulls give that recipe a go. However there are a few hybrids, the AAHS is kind of a parallel wall hull with a more or less compression formed base wad in it making is similar to both is many ways. There are basicly 2 types of hulls, one piece 'Compression formed', straight wall separate base wad hulls, 'Reifenhauser'.As a leading provider in the industry, the Reifenhäuser Group offers the right hightech solutions for the production of blown films, cast films, thermoforming sheets, nonwovens, monofilaments and WPC products.

The NEW Winchester AA® hull (refered to as “High Strength™” or “HS” by Winchester) is a three-piece Reifenhauser type design.

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