Bullet jump,seating depth & powder charge ???


Firearm & Gun Forum - FireArmsTalk.com > Gear & Accessories > Ammunition & Reloading > Bullet jump,seating depth & powder charge ???

Reply
 
LinkBack Thread Tools Display Modes
Old 01-11-2010, 11:54 PM   #1
Feedback Score: 0 reviews
 
Join Date: Jul 2008
Location: NJ
Posts: 15
Default Bullet jump,seating depth & powder charge ???

In my quest for suitable round for my AR, I am diving into the uncharted waters of the infamous OAL/seating depth guage.

But which comes first?
Do you experiment with various powder charges then various OAL depths using a seating guage...or
Do I adjust the seating depth first, maybe .15 to start then experiment with powder loads.

I am using a Hornady seating depth/OAL guage & a Hornady comparator if that eases your minds. I will measuring at the ogive.



__________________
ah141nj is offline  
 
Reply With Quote

Join FirearmsTalk.com Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join FirearmsTalk.com Today! - Click Here


Old 01-12-2010, 12:23 AM   #2
Feedback Score: 0 reviews
 
Join Date: Oct 2007
Location: Stafford, Virginia,The state of insanity.
Posts: 14,043
Liked 34 Times on 29 Posts

Default

first I find my bullet for my 223 I setteled on a 50gr V-max for ar it will be different.

I then find 2 or 3 powders I like, varget, Re10x, Benchmark, AA XMR2015 are some of the ones I have used.

Then I load a ladder of 5 each at .5gr intervals then I take the most accurate out of that lot then I go up and down by .2 gr increments. Once I find the most accurate load there then I start messing with the OAL. To start I will measure and just go .040" off the lands. Then once all other variables are taken care of I start on the OAL. the OAL is the last step in the process for me.



__________________
cpttango30 is offline  
 
Reply With Quote
Old 01-12-2010, 12:50 AM   #3
Feedback Score: 0 reviews
 
Join Date: Sep 2008
Posts: 190
Liked 15 Times on 12 Posts
Likes Given: 1

Default

+1 on what cpttango30 said,don't throw different variations in the mix all at once. There is a combination that each gun likes,sometime you get lucky but most times you have to narrow it down one component and one adjustment at a time.

__________________
res45 is offline  
 
Reply With Quote
Old 01-12-2010, 02:29 AM   #4
Feedback Score: 0 reviews
 
Join Date: Jul 2008
Location: NJ
Posts: 15
Default

Quote:
Originally Posted by cpttango30 View Post
first I find my bullet for my 223 I setteled on a 50gr V-max for ar it will be different.

Then I load a ladder of 5 each at .5gr intervals then I take the most accurate out of that lot then I go up and down by .2 gr increments. Once I find the most accurate load there then I start messing with the OAL. To start I will measure and just go .040" off the lands. Then once all other variables are taken care of I start on the OAL. the OAL is the last step in the process for me.
The 50 gr Vmax is what I was trying out. Used H335, H322 & BLC2 with starting points at 10% lower than max in .3 increments till max.
Had the best results with H322 from 22.7 to 24.2 grs. I know its a wide margine, most of it was probably my fault. Actually, I think 23.9 was my best.

I am now looking to "fine tune" using seating depth powder adjustment.

.040 of the lands? isnt that a lot? my lands measurement was 2.010
less .040 would be 1.97 at the ogive & 2.35 in OAL...way to long for a
magazine

Does 2.010 sound about right?
__________________
ah141nj is offline  
 
Reply With Quote
Old 01-12-2010, 01:41 PM   #5
Feedback Score: 0 reviews
 
Join Date: Oct 2007
Location: Stafford, Virginia,The state of insanity.
Posts: 14,043
Liked 34 Times on 29 Posts

Default

My bad it is .020" off the lands I start with.

I had to check my load listings.

I forget what mine measured and i am at work. If I get a chance tonight I will bundle up and head out to the relaoding room and check some stuff.

Remember my gun is also a bolt action remmy 700 so YMMV.

__________________
cpttango30 is offline  
 
Reply With Quote
Old 01-14-2010, 03:54 AM   #6
Feedback Score: 0 reviews
 
Highpower's Avatar
 
Join Date: Oct 2009
Location: Upper Mississippi Valley
Posts: 1,547
Liked 355 Times on 200 Posts
Likes Given: 292

Default

Quote:
Originally Posted by ah141nj View Post
.040 of the lands? isnt that a lot? my lands measurement was 2.010
less .040 would be 1.97 at the ogive & 2.35 in OAL...way to long for a
magazine
Depends on the bullet. I use Tango's method as well. But when I am loading Sierra 80 gr MatchKings for my AR, .020" off the lands translates to an OAL of 2.555" in MY rifle. But those bullets aren't designed to be fed from the magazine. Sometimes you just have to go with whatever it takes to get the rounds to fit in the magazine (ie. 77gr) and not worry about the jump to the lands. Example: 300 yd rapid fire strings in Highpower rifle competition.
__________________
Highpower is offline  
 
Reply With Quote
Old 01-14-2010, 01:04 PM   #7
Moderator
FTF_MODERATOR.png
Feedback Score: 1 reviews
 
robocop10mm's Avatar
 
Join Date: Jul 2007
Location: Austin,Texas, by God!!
Posts: 10,107
Liked 2773 Times on 1449 Posts
Likes Given: 242

Default

Loading for an AR is very different than loading for a bolt gun. You will not likely get very close to the rifling AND have a load that will fit in the magazine. Most AR's have a fairly long throat. I would load just short enough to reliably feed from the mag. For the best accuracy you will have to load the ammo into the gun one at a time.

__________________

In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball


Last edited by robocop10mm; 01-14-2010 at 08:10 PM.
robocop10mm is offline  
 
Reply With Quote
Old 01-14-2010, 05:42 PM   #8
Feedback Score: 0 reviews
 
Highpower's Avatar
 
Join Date: Oct 2009
Location: Upper Mississippi Valley
Posts: 1,547
Liked 355 Times on 200 Posts
Likes Given: 292

Default

+1
I've never seen it stated better than that.

Your sure do talk purdy Robo.

Communication is not one of my better skills.



__________________
Highpower is offline  
 
Reply With Quote
Reply

Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
double charge in bozooka? m72law NFA/Class 3 & FFL Discussion 17 12-11-2012 11:24 AM
THIS will change when I'm in charge! Dillinger The Club House 42 12-19-2008 02:11 PM
If I could be in charge for one day........ SGT-MILLER Politics, Religion and Controversy 15 11-24-2008 01:54 AM
Depth Question killerclowns Ammunition & Reloading 2 08-08-2007 10:59 PM