Bought it because I was converting 308 brass to 300 savage brass, and I was doing some volume trimming. I had a redding trimmer, and it was too fussy about locking the shells in, and was a severe aggravation to deal with. No one had 300 savage brass in stock, and I had plenty of 308 brass, and I also bought a power adapter from another source, and this was no doubt well worth the money I spent, not to mention the money I saved by not buying the costly 300 savage brass to start with from a supplier.