That's the one 1.5 leade Seringeti. they come .340" and .377" I wanted the .340 and got the .377". Once I get it sorted out I think I will be okay. My rifle shoots the 155 Palma good with no problems but the long bullets are not going in straight enough with my regular seater. I've been told the competition seater die should solve my problem. When I'm seating the bullets I can feel the ones that are going in a little off center and the ones that go straight in.