While in this cleaning and sorting phase, I found a good amount of FA Match brass. Tumbled and sized, I happened to measure the base in front of the extractor groove. It measured .4685 to .469 With so much brass measuring .464-465 it's great to have some that wont bulge at the base in some of my more generous chambers.
While in this cleaning and sorting phase, I found a good amount of FA Match brass. Tumbled and sized, I happened to measure the base in front of the extractor groove. It measured .4685 to .469 With so much brass measuring .464-465 it's great to have some that wont bulge at the base in some of my more generous chambers.
I have 30/06 dies that are mistakes. All of the other 30/06 dies I own will size the .4685" and .469" cases. I do not have chambers that will allow case head expansion. I can load ammo with enough powder to increase the case head diameter and I can use bullets that are too heavy.
I also have small base dies. If fire a case that causes the case head to expand from .464" to .469" I am doing something very wrong.
When I said bulge at the base,I mean in front of the web. Many chambers will leave a bulge there as brass .464 at the solid portion, tapers of course. Starting with larger brass at the web, means less bulge showing.
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Posts: 2135 | Location: Where God breathes life into the Amber Waves of Grain and owns the cattle on a thousand hills. | Registered: 20 August 2002
There will be a pressure ring on all brass at the point where the thickness of the brass in front of the web becomes thin enough that it will expand under pressure to match the diameter of the chamber. Obviously, if the case head at the web is larger, then the difference in the case head diameter and that of the case at the pressure ring will be smaller.
As pressure increases the pressure ring is formed further rearward on the brass since the higher pressure is able to deform thicker brass.
At fairly low pressures the pressure ring may not be particularly noticeable since it will be further forward and more gradual.
Posts: 13263 | Location: Henly, TX, USA | Registered: 04 April 2001
I should have had you explain what I meant the first time Stonecreek.
And I would not have gotten involved had you not mentioned FA NATIONAL MATCH, it would have been more interesting to me had you mentioned FA57 NATIONAL MATCH.
