Home Forums Classifieds Blogs Today's Posts Search Social Groups



  
SIGN-UP
Notices

Glock Talk
Welcome To The Glock Talk Forums.

 
  
Reply
 
Thread Tools Display Modes
Old 12-28-2012, 21:17   #1
Vatwo
Junior Member
 
Join Date: Nov 2012
Posts: 12
Help on crimp and CoL please

Just started loading 9mm for use in the indoor GSSF league shooting paper targets at 25 yds max. I am new to reloading and am struggling with the crimp amount on the Hornday LnL press. Is it ok if the bullet can be turned some in the case after crimping? Seems if I try to crimp any tighter I start to crush the case. Also, how consistant should the Case Overall Length be? Seems mine are varying as much as 10 thousands. Is this normal?

Thanks in advance,
Gary
Vatwo is offline   Reply With Quote
Old 12-28-2012, 21:28   #2
buckshotshorty
Senior Member
 
buckshotshorty's Avatar
 
Join Date: Sep 2007
Location: Central Florida
Posts: 1,179
The bullet should not be able to turn inside the case. If it's that loose, it could possibly set back upon loading into the chamber. That would greatly increase pressure.
Are you full length sizing your cases? That alone should eliminate any movement of the bullet by making a tight fit. The only other thing I can think of is you may be flaring the case mouth too much.

The 10 thousands variation sometimes occurs. I think that all depends on the uniformity of the bullets and you really can't control that.
__________________
.

Too light for heavy work, too heavy for light work!
pb

Last edited by buckshotshorty; 12-28-2012 at 21:31..
buckshotshorty is offline   Reply With Quote
Old 12-28-2012, 22:17   #3
fredj338
Senior Member
 
fredj338's Avatar
 
Join Date: Dec 2004
Location: so.cal.
Posts: 22,133
Blog Entries: 3
Make sure the szing die is screwed all the way down to the sheel plate. CHeck your expander dia, make sure it is not more than 0.354", smaller is better. Overcrimping can cause less neck tension, as you bow the case away from the bullet. Check your brass, some brass is thinner than others & w/ 0.355" bullet, you won't get proper neck tension, regardless of how much crimp you apply. Crimp just finishes the handload, it does NOT hold the bullet in place.
__________________
"Given adequate penetration, a larger diameter bullet will have an edge in wounding effectiveness. It will damage a blood vessel the smaller projectile barely misses. The larger permanent cavity may lead to faster blood loss. Although such an edge clearly exists, its significance cannot be quantified".
fredj338 is offline   Reply With Quote
Old 12-29-2012, 08:41   #4
PCJim
Senior Member
 
Join Date: Aug 2008
Location: FL
Posts: 2,948
Gary, you are experiencing a common misconception new reloaders have with the term "crimping" and the reloading of straight-wall cases for autoloaders. Crimping generally refers to imparting a very light turn of the case mouth into a cannelure (groove) in the bullet. When dealing with straight-wall autoloading cases (9mm, 40S&W/10mm, 45acp to mention a few), you do not want to crimp the case mouth into the bullet. You only want to remove the flare / bell that you formed on the case mouth so that you could begin to seat the bullet. If you attempt to squeeze the case mouth beyond removing the flare / bell, you will begin to squeeze the bullet and, as stated above, actually reduce the case purchase (grip) on the bullet.

If you want to check your die adjustments using a caliper, measure the thickness of your case wall at the mouth and double it, then add the diameter of the bullet. This should be the outside measurement of the case at the mouth after seating a bullet.

Further, you can check for adequate tension on the bullet by performing a benchtop test. Measure the COL of your finished round, press the nose of the bullet against a hard, firm surface such as your benchtop with adequate pressure, then remeasure the COL. It should not change.
PCJim is offline   Reply With Quote
Old 12-29-2012, 09:22   #5
Zombie Steve
Decap Pin Killa
 
Zombie Steve's Avatar
 
Join Date: May 2007
Location: Old Colorado City
Posts: 19,935
Welcome to GT and GT Reloading.

Good advice here so far.

Easy check - size a case, then try to start a bullet in there. If it goes in, your problem is the sizer. You shouldn't be able to get a bullet in a resized case with your hands. Next, look at flare - you just need to open up the mouth a teeny bit so that you can start a bullet into the case. Don't overdo it. Taper crimp is just removing that teeny flare after the seating die has pushed in the bullet. This is easy to overdo as well. Use just enough so you can drop the cartridge in your chamber (take the barrel out of your gun first) and it sits flush or slightly below the barrel hood. It should fall out easily.

Good luck!
Zombie Steve is offline   Reply With Quote
Old 12-29-2012, 20:50   #6
Vatwo
Junior Member
 
Join Date: Nov 2012
Posts: 12
Thanks for the great advice and explanations. I was totally off base on the seating and crimping. I read the words of experience, readjusted some dies and all is working great. I shot my first reloads at the range today.

Thanks for the advice all, it really helped out.

Gary
Vatwo is offline   Reply With Quote

 
  
Reply

Thread Tools
Display Modes

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 -6. The time now is 17:26.




Homepage
FAQ
Forums
Calendar
Advertise
Gallery
GT Wiki
GT Blogs
Social Groups
Classifieds


Users Currently Online: 951
291 Members
660 Guests

Most users ever online: 2,672
Aug 11, 2014 at 2:31