The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Thread Tools Search this Thread
Old May 13, 2002, 08:54 PM   #1
Senior Member
Join Date: December 15, 2001
Location: New Hampshire
Posts: 417
What is gascheck?

I've seen the term around, and I was wondering what it is. What is the purpose of it?
My PGP key
mdlowry is offline  
Old May 13, 2002, 09:43 PM   #2
Senior Member
Join Date: March 16, 1999
Location: So. CA Mountains
Posts: 540
Think of it as a very short jacket. Covers the base of a cast bullet, extends maybe 1/10" up the sides.
Some folks fondly believe they prevent hot gases from cutting up the sides/base of a lead bullet. Sometimes they work, too.
There are damn few situations so screwed up that adding government to them will not make 'em worse...
The best homeland security is an armed & informed citizenery!
Molon Labe!
swifter... is offline  
Old May 14, 2002, 09:24 AM   #3
Member In Memoriam
Join Date: November 29, 1999
Location: west of a small town, CO
Posts: 4,346
Too, the cast bullet must be designed to accept a gas check. The bullet base is slightly less in diameter than the rest of the bullet. You can't realistically stick a gas check on a bullet with a full-caliber base (although I'm sure someone will prove me wrong - lots of "home-gardening" with reloaders).

Coupla kinds: Hornady's got one (I've never used it) that is similar in use/different in stickin' in on (?), but different than Lyman's which gets crimped onto the bullet base during the sizing operation.
labgrade is offline  
Old May 14, 2002, 10:19 AM   #4
Steve Smith
Senior Member
Join Date: December 9, 1999
Posts: 4,131
The Hornady is a press fit onto the bottom of a GC bullet. When yourun the bullet through the sizer, you put the bullet in position, and press the GC onto the bullet base a little. Then you run the ram and it presses the GC onto the base. If you're pushing lead really fast you'll usually need them.
Favor the X.

Steve Smith
NRA Life Member
Steve Smith is offline  
Old May 14, 2002, 04:56 PM   #5
Senior Member
Join Date: December 10, 1998
Location: NY
Posts: 680
All very good responses:

A gas check is, in effect, an increase in bullet base hardness to prevent the bullet base area from deforming and overcoming the film strength of the bullet lube with the heavier loads.

It also can be thought of as a "wrench" to engage the barrel rifling and prevent stripping in the bore with heavy loads.

Contender is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 10:14 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2017 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent:
Contact Us
Page generated in 0.08871 seconds with 9 queries