Long Range Hunting Online Magazine

Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Berger Bullets


Case Base Expansion as High Pressure Sign

LinkBack Thread Tools Display Modes
Unread 06-13-2005, 07:14 PM
Junior Member
Join Date: Feb 2004
Location: Georgia
Posts: 23
Case Base Expansion as High Pressure Sign

Where do you measure a case base(25-06) - just as it begins to rebate? Is this a good indicator of pressure ? How much should it expand after firing - I have been told .005 indicates high pressure. Working up a load with 115 gr. Triple-Shocks and am at 1.5 grains over max - case base measures same before and after firing.
Reply With Quote

Unread 06-13-2005, 07:57 PM
Writers Guild
Join Date: Jul 2001
Posts: 1,459
Re: Case Base Expansion as High Pressure Sign

Measure within 1/8" of the extractor groove. The big thing is be consistent. How much is a very dangerous question because of all the variables in a chamber.

Best thing is to shoot factory ammo with the same brand of brass you are using. Better is to sample a few and compare.

Measure what the expansion is. Compare to your load. This only works for new virgin brass. Measuring expansion on once or multi fired brass will give the wrong results.

Also, compare to muzzle velocity. If more then 100fps above listed max vel, back off. Then there is primer flattening, etc, etc.

Reply With Quote


Thread Tools
Display Modes

Similar Threads for: Case Base Expansion as High Pressure Sign
Thread Thread Starter Forum Replies Last Post
Primer pockets expanding. Pressure sign? bweber Reloading 21 07-15-2013 06:18 PM
The first sign of excessive pressure is... buckbrush Reloading 45 07-08-2013 09:32 AM
Low pressure sign??? 300RUM Bushcraft Reloading 14 11-29-2010 11:36 AM
High Pressure Flush System/High Speed Chambering Class Rustystud Gunsmithing 11 12-22-2009 11:26 AM
pressure sign discusssion jmden Rifles, Bullets, Barrels & Ballistics 1 07-01-2004 01:36 AM

All times are GMT -5. The time now is 12:47 PM.

All content ©2010-2015 Long Range Hunting, LLC