As an example , I have formed a single 243 win case out of a 284 win case using the above method....
How the heck did you manage to get the case web reduced in diameter that much while keeping the rim intact with just one die?
One thing to keep in mind when forming cases in this manner is that your new cases are going to be quite thick due to the fact that you have been shoving back the shoulder area and case body
That part is the one think I find most impossible; when I move the shoulder back the case body beneath the shoulder folds like an accordion.
F. Guffey
With all due respect Mr. Guffey , if that is what happens when you move shoulders back then you my friend are doing it wrong and have been for quite some time..
And then there is the case head, most case heads are solid with a small hole in the center.
F. Guffey
I would think it safe to say I have moved the shoulder back..
? I,m lost on that one.
Semantics.
Shoulder 'doesn't move' = shoulder re-formed out of what once was case wall, while former shoulder becomes new neck.
Base-to-shoulder datum is changed according to specs of cartridge shape desired.
Thanks for that explanation patch. I had not thought of using a seating die. I had been planning to use a series of standard factory dies though. I'm sure not going to buy any special forming dies to do it. I may buy some sort of neck reamer.Tomato: fruit, or vegetable?![]()
You will need a die with bushings like this one. Looks to be a 308 to 6BR case forming.
I copied this photo from this web forum, maybe whom ever made it will reply.
You might search this site for "forming dies" or "shoulder set back die" to find the information you need.
Good luck
I,m lost on that one.
And I would say you did not move the shoulder, I would say you reduce the length of the case from the new shoulder to the case head but again I would insist you did not move the shoulder. I would insist part of your case body became part of the new shoulder and part of the old shoulder became part of the neck.
You would be surprised at what you can form without having "Form dies" by simply starting with the newly chosen caliber seating die and leaving it high up in the press so as when the ram is near the top of the stroke that is the point at which a small amount of sizing begins..
The first picture shows a set of shoulder set back dies made by pbike257 (a member on this forum) and they work very well. If you do a search on this site there is a video he made demonstrating how they work. Unfortunately he has not been heard from in quite awhile. I don't know who made the dies in the second picture. dedogsYou will need a die with bushings like this one. Looks to be a 308 to 6BR case forming.
I copied this photo from this web forum, maybe whom ever made it will reply.
You might search this site for "forming dies" or "shoulder set back die" to find the information you need.
Good luck