THE ACCURATERELOADING.COM FORUMS


Moderators: Mark
Go
New
Find
Notify
Tools
Reply
  
Sticky bolt
 Login/Join
 
One of Us
posted
Gentlemen,

Is there a specific pressure threshold where as you begin to witness brass failure and a sticky bolt scenario? 80 KSI, 90 KSI?
Just curious.

EZ
 
Posts: 3256 | Location: Texas | Registered: 06 January 2009Reply With Quote
One of Us
posted Hide Post
I'm just curious too. Why in heavens name would you want to know this? Do you intend to load up until that point? Most of my guns shoot their best towards the top end of maximum load, but you are generally going to have to exceed maximum recommended loads to experience such pressure problems. Don't do it on purpose. It does no good to your gun and might do some damage to you.
Moosie
 
Posts: 29 | Location: South Texas | Registered: 03 June 2009Reply With Quote
One of Us
posted Hide Post
For the most part, just curious. I am mechanical engineer. I could pull out a few old text books and determine at what pressure brass will flow but thought someone must know off the cuff.
Typically there is a 2X safety factor when calculating pressure extremes and safety margins at SAAMI appears to limit loading to a little above 63 KSI. so I surmise most "modern bolt guns" will destruct about 130 KSI. There are so many variables in that comment though.
I am sure the brass flows far below that level.
I have been loading about 40 some odd years so I am pretty familiar with what you can do and cannot and by the way; these reloading guides are a reference and are becoming more conservative over the years to compensate for chamber and barrel variations, not to mention lawyers(LOL). I would highly suggest following their guidelines.
There was a sample of a "overload" for years at a local gun range (on the wall) where it was said that some one shot a 308 round in a 25-06 chamber. Talk about pressure extremes! Swaging that 308 bullet down to 257 and out the barrel. The stock (case rupture and gas expulsion) and was blown apart but the action and barrel was intact.
I would have hated to be hold that gun!!!! Not sure how the cartridge was chambered to begin with??
If you load on your own, all are well advised to get a chronograph. So much of the data out there is off considerably (velocity). Nice to be able to realy observe what you are doing.
BTW; I suspect brass (typically) flows a little over 70 KSI pending the actual alloy properties.

EZ
 
Posts: 3256 | Location: Texas | Registered: 06 January 2009Reply With Quote
  Powered by Social Strata  
 


Copyright December 1997-2023 Accuratereloading.com


Visit our on-line store for AR Memorabilia