One other thing to keep in mind about the .410 is that the hulls are not all the same length, even in the same brand in some cases, like Winchester. Its not an issue if you sort them first and set your press up accordingly.
On the MEC 600 press, be sure to have the snap on gadget that holds the hull firm to the press in the prime station. Life w/o it is no fun. Polishing the inside of the drop tube is a very wise thing to do for less shot bridging.
FWIW, Federal & Remington both at one time made specific .410 primers. They were 'softer' or had less brisance. Before the new AAHS .410 hull, I got the best life from Remington hulls, the older Riefenhauser(sp?)ribbed hull, but it was easier to get a full .5 oz. load into the Federal hulls. I hated the original AA wads because they took up too much room and were not flared, Winchester finally began flaring them some years later. The unflared ones would come right back out of the case w/the drop tube and dump shot everywhere w/regularity. The flared one are easier to load & they tend to stay in the hull better. I like the older PC orange wads best for the .410.
