That bullet is cut for a check , go ahead and use one, much easier to get accurate loads with it checked, especially at magnum velocities.
You can adjust your lube/sizer to fill one groove. I have a 450 and the adjustment screw is below the sizing die, in the linkage . My advice is to fill them all , except the very top crimping groove...don't fill that one. This bullet is designed with one lube groove and a little will go above the gas check, so you adjust the depth screw so that the top crimp groove doesn't go down far enough into the die to get filled. It's easy once you see it done.
When it comes to sizing, lubricating and gas checking, a lube/sizer, like the 450 or 4500 is a wonderful thing. One cycle of the handle and the bullet is sized , lubed and the gas check is crimped on. It's the only way to go ! I love mine. Save up and get one, worth every penny.
Last edited by gwpercle; February 8th, 2017 at 12:47 PM.