Quote Originally Posted by Harter View Post
It's tricky. It's the same as the deal with the Barnes X and GMX etc . You kind of have to start with the fastest powder that will give a full or near full case for a bullet weight in-between and sort out the bearing length .......as I understand what I've read about it. So in the case of the 180/113 in a 308/06' where it's one of the bore ride spritzers , you use something like 4350 start looking for a 165 as a maximum load and work from there . If you have something more like the 309291 or 299 that requires deeper seating you'll want to start with data for a 130-145 and the bottom 1 or 2 powders.

The zinc has lower friction than copper but doesn't move , as in engraving, as easily as lead or copper.

Using the light weight data can over pressure because of case space and initial movement and the dimension data might not reach pressure at all .

When in doubt with 30 cal and up fill it up to the bottom of the neck with 4831 and see what happens. It was designed and used for both the Orclon (sp) and later bottle necked 20 mm cannon .
That makes sense to me. What you saying is exactly where my mind was taking me with it.


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