Long Range Hunting Online Magazine


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

Reloading Techniques For Reloading


Reply

Seating depth and pressure

 
LinkBack Thread Tools Display Modes
  #8  
Old 10-05-2007, 12:05 AM
Bronze Member
 
Join Date: Dec 2006
Posts: 47
crittergitter
Check the headspace of fired and unfired brass with a shoulder gauge or Precision mike.
If the case head has enough room "to get a run at the bolt face" it will leave an ejector mark on the brass -rather like the way the cases are made. I have seen this firing new Weatherby brass in a factory .30-378 chamber that had + .006 " clearance on the belt before firing.

Clean your chamber with rubbing achool on a mop before firing. Wipe the cases down also and put greese on the back of your lugs.
Now tell us what happened.
Glenn
Reply With Quote
  #9  
Old 10-06-2007, 02:25 AM
Bronze Member
 
Join Date: Apr 2007
Location: Cumberland Plateau
Posts: 65
Wow, lots of suggestions to reply to! I seriously doubt that the cases or chamber had any friction reducing contaminates on them. I've been paranoid about that after seeing smeared case heads and disintegrated primers result from someone moly coating their chamber (not me). Nevertheless, that is the most likely variable that I would have overlooked. There was a thorough cleaning before and after each group that was followed by an oil patch and a dry patch. I generally swab the chamber with alcohol before hitting the range, but I may not have fully stripped the chamber of oil this time. I'll give extra attention to that step next time out.

Cases are new, and I am bumping the shoulder with the die because factory inconsistency within the lot is enough to prevent a case from chambering without excessive force every now and then. I sized the second set of cases on a different day, so I suspect that it is possible that I might have had the die set too deep with the first round, although I don't think so. I cannot measure any difference in the headspace on a newly resized case and a fireformed case, and I have not adjusted the depth of the die. I did remove it from the press and reinstall it.

I'll post again after my next outing. If I have a positive experience, I'll assume that there was some cleaning error or other fluke variable that I overlooked. Thanks for the advise.
__________________
MB
Reply With Quote
  #10  
Old 10-10-2007, 09:48 PM
Bronze Member
 
Join Date: Apr 2007
Location: Cumberland Plateau
Posts: 65
Update on load development for the 338/ 300 RUM. I have worked up to 105 grains of US 869 and have barely noticeable (in the old days I'd still be working up) pressure signs. The 300 SMK is cruising at 2957 fps and fired a 3 shot, .6" group at 100 yards on a squeaky clean bbl. The second 2 shots punched the same hole unmeasurably close. ES is + or - 20 fps. I think I'll stick with this load for a while.
__________________
MB
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Seating depth and pressure
Thread Thread Starter Forum Replies Last Post
Seating depth vs Pressure desertbull Reloading 11 05-24-2011 01:37 PM
which seating depth cabinfever Reloading 6 02-16-2011 11:19 AM
25-06 V-Max seating depth wallypedal Reloading 4 03-27-2007 09:22 AM
Chamber Leade, Seating Depth, Powder Capacity, Pressure Chester Evans Reloading 5 07-02-2005 07:11 PM
6.5-284 Seating Depth okshooter Rifles, Bullets, Barrels and Ballistics 3 02-28-2004 11:06 PM

Current Poll
Do you wear hearing protection while hunting?

All times are GMT -5. The time now is 12:25 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC