As I suspected.... so - you might want to consider what bullet you want to shoot, and at what seating depth. Make up that "dummy" round and take it to your fav. smith and have him lengthen the leade for it.

Alternatively, you could also roll-your-own and set the seating die to give you the desired length. I'm sure handloading will be way better than buying factory loads, but you will figure out what works best for you.

Just a suggestion.