Thats good for a flat base but not really going to work for a boattail
As I have the die to make a flat base too, perhaps I can use this method in which the jacket stretches and replicate it with the same pressure in the core seat operation of the boat tail bullet.
George, how do you tell when you have seated the boattail core hard enough? When you have "stretched" the jacket enough. It seems measurable with a flatbase. But when is enough "enough" on a boattail?
George, when you say “stretch mark” is that any line showing around the outside of the jacket? I usually seat the core until I see a faint thin line, a little bleed by, and a slight taper .243.05 at boat tail and .243.10 at the lead line. What can I use to spin the core seated bullet to check run out?
Thank you George. As usual, you give excellent advice. This string has more practical advice and knowledge than any other I have followed. And i believe i have read all the bullet making threads.
^^^^truth^^^^^
Randy or George, can you explain the preforming process? I am taking a guess here, but is the core seat die(obviously no core) used with a special punch? Lubed?
Any discolored line showing that the jacket is stretching. they will turn a bright gold color as the jacjet starts to separate. you can use a bullet spinner or just rig up female centers and an indicator..
Al I like cutting down both sides and peeling it off like a banana to examine the core ...Randy's jacket stretch guideline is one of the biggest nuggets of gold in this thread. I encourage anyone making their own bullets to also use cutaways as you get familiar with your core seating pressure. This is a raggedy-azzed Dremel job but the info is there as to how the core fits the jacket. You'll be surprised at the internal appearance of the pleats, too.
