Attn PPC bullet makers

[PHaxell]

To all of you who make 6mm bullets on .790’s or .825’s.
When you buy a new set of dies does anyone have a method to determine where a pointed bullet may shoot best? You need to point them enough such that they eject and the other end of the spectrum are the fish lips. Those points may be some distance apart.
Other than making them and testing them at every .001” change in base to ogive length are there any tricks to help you get there faster? It could take me months or longer to test that.

Secondly, when you need to change jacket lot, do you guys find the new lot shoots the same base to ogive length or does it need adjustment?

And lastly, do you guys find that if make a corresponding change in core weight for a new jacket lot the new lot will shoot well? For example say you shoot a 68gn and your jacket is 23gn. For this you need a 45gn core. A new lot of jackets weigh 22.5gn. Can you simply make a 45.5gn core and have your new 68 shoot the old base to ogive length and they will shoot?

Many thanks in advance to all you legends for your thoughts. I appreciate it.
Peter

 

[jackieschmidt]

We have a fantastic thread started by Al Nyhus running that answers a lot of your questions.

Thread 'Time to make the donuts....'

Dec 9, 2024

Like the old Dunkin' Donuts commercial....time to make the bullets.

A colander full of washed cores, rinsed and ready to dry:

Then rolled on a big slurp up towel:

Spread out to dry on a beach towel. Tomorrow, they'll get stuffed into jackets.

Good shootin' -Al

• AlNyhus
• Replies: 1,219
• Forum: Competition Forum (All Calibers)

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The short answer is any time you change any part of the bullet making formula, you have to adjust something else to compensate.

I keep all of my cores at the same weight. I get them from Charlie Hood.
That means if a new lot of jackets are a tad heavier or lighter, I will have to change the core seating pressure ever so slightly to arrive at the exact seated core dimensions I want. I might have to go up .0005 up or down on lunch size, depending on the jacket difference.

As for the point up, through trial and error at the range, I determined which point up distance shoots best out of my Dies. That is the only real way to determine this aspect once you get the metplate small enough so the knock out pin works correctly.

In short, I always try to maintain the correct core seated dimensions, both length and diameter, and point up dimensions, both diameter and base to ogive..