Bullet making jacket stretch

The jackets stretches at core seating only then base to point lenth should all be the same length my two cents worth
 
zippy06 said:
Thought we were typing about overall stretch start to finish?
Lead line. I was told to make sure a very small amount of bleed by. And to make sure it's even. That way you know the lead is concentric in jacket. And the jacket self centered. 10X loupe.
Now I hear no bleed by. How can you see if it is self centering???
I have gotten bullets before I made my own. Could not get these to shoot. 6-8" group. I started looking at them with a loupe and measuring everything. Found a little lead poking out the hole. Not everyone. Just a few. So either the punch was too small or jacket did not self center. 1000 bad bullets.
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What can be done if the bleed-by is not uniform around the entire circumference?
 
You need a good number of punches for core seating 2or3 ten thousand on either side of the nominal size ie. .211 2-3 or.210 8or6 punches
 
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This has been an interesting experience having two dies from the same maker side by side - they are very different! I believe that the boat tail portion of my original die is significantly shorter than the new die (significant being .010 measured under a specimen microscope, but it is absolutely visibly longer than the original die. Not as accurate as a laser scan, but you can clearly see the difference with a set of calipers opened to .035 original core seat die and .045 new core seat die - these are .060 boat tail c.s. bullets).
The same lot and lube on the jackets and same cores with equivalent core seat pressures and same punch size.
Original dies only stretched .001 where the new die stretched .006. Coleman fuel cleaned cores - old dies shrunk .002 and the new die stretched .005.
Both bullets spin less than .00005 (that is correct - my friend has a .00002 bullet spinner and the needle just barely moves on either one).
This does NOT mean that they shoot well, but it doesn't hurt. Plenty of bullets spin .0002 and shoot lights out, and flat base .0004-5 from what I understand.
Does the amount of stretch/boat tail length matter in the end? I have made up a lot of each to test side by side at 200yds and plan to let them prove themselves out - I have a feeling I won't be able to see the difference, but if I can one of these dies will be up for sale either way!
Thanks for your time in reading all this and giving input. I really started to think I was missing something in my preparation of the jackets, cores, etc... but this new die set lets me speak the same language as everyone else now. These dies truly are like snowflakes - no two the same.
 
savet06 said:
This has been an interesting experience having two dies from the same maker side by side - they are very different! I believe that the boat tail portion of my original die is significantly shorter than the new die (significant being .010 measured under a specimen microscope, but it is absolutely visibly longer than the original die. Not as accurate as a laser scan, but you can clearly see the difference with a set of calipers opened to .035 original core seat die and .045 new core seat die - these are .060 boat tail c.s. bullets).
The same lot and lube on the jackets and same cores with equivalent core seat pressures and same punch size.
Original dies only stretched .001 where the new die stretched .006. Coleman fuel cleaned cores - old dies shrunk .002 and the new die stretched .005.
Both bullets spin less than .00005 (that is correct - my friend has a .00002 bullet spinner and the needle just barely moves on either one).
This does NOT mean that they shoot well, but it doesn't hurt. Plenty of bullets spin .0002 and shoot lights out, and flat base .0004-5 from what I understand.
Does the amount of stretch/boat tail length matter in the end? I have made up a lot of each to test side by side at 200yds and plan to let them prove themselves out - I have a feeling I won't be able to see the difference, but if I can one of these dies will be up for sale either way!
Thanks for your time in reading all this and giving input. I really started to think I was missing something in my preparation of the jackets, cores, etc... but this new die set lets me speak the same language as everyone else now. These dies truly are like snowflakes - no two the same.
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What's the ogive? And what is the measurement at the BT? Thank.
 
I recently acquired a used set of .224 dies made by Simonson.

Although they are not carbide and probably quite worn, the bullets produced have excellent accuracy.
The only negative point is that the tip is larger, and 7 ogive I believe, as they were probably manufactured with short-range shooting in mind.
 
zippy06 said:
What's the ogive? And what is the measurement at the BT? Thank.
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These are 7-10.5 and the final bullet measures .2431 on the new dies and as small as 2428 on the old dies. At core seating the old dies are .2431 at the most pressure I can put on them and the new dies will show similarly, but can be made 2432.
 
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