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Bullet seating depth?

 
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  #15  
Old 01-22-2013, 12:52 PM
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Join Date: Nov 2012
Location: Wyoming
Posts: 323
Re: Bullet seating depth?

Being newer to reloading, I hadn't actually ever heard the "1 Cal. depth" seating rule. Seems like a good starting point though. I usually end up about .010" off the lands, with my guns anyway...
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  #16  
Old 01-23-2013, 11:32 AM
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Join Date: Apr 2012
Posts: 3
Hornady LNL detpth gauge with comparator

Quote:
Originally Posted by Gene View Post
The manuals suggested OAL's are to keep it short enuf to feed thru most magazines.

To determline where the bullet ogive touches the lands, get a Hornady bullet comparator and read the instructions. The lighter bullets may need to be seated down so that they are not able to reach the lands. Try to keep minimum of about .01" of bullet in the neck.
There! this is the comment I have been waiting to see in this thread. All other discussion had proved fruitless for me until i got one of these babies.

And the Barnes bullet company insists that the ogive of it's projectiles be seated 50+ off the lands, and this simply can not be done on a replicable fashion without one of these gizmo's.
I find that my hunting guns prefer the ogive of the bullet to be 10-20 thou. off the land. In fact, the more powder I stuff into a case, the more i will back the bullet up.

this one tool has been the best investment in reloading stuff i have made for consistent shooting while switching up projectiles.

as for how deep to seat in the neck, if the entire neck surface of the case is not engaged with the bullet, i don't do it. Again, it has to do with consistency. statistically, there is very poor consistency with case/bullet friction with only 100th" of the bullet in the case mouth.
No, I am not a math prof nor an engineer, however a lot of shooting buds at the club are and i deem them worth listening too as these old boys can shoot circles around me.
good shooting folks!
jsd
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  #17  
Old 01-23-2013, 11:54 AM
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Join Date: Jun 2010
Posts: 165
Re: Bullet seating depth?

Got to the following site for a cheap effective way to determine the best OAL for your rifle:
Innovative Technologies - Reloading Equipment

Go to Reloading and Shooting Tech Tips and then to Best OAL.
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  #18  
Old 01-23-2013, 01:20 PM
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Join Date: Apr 2012
Posts: 3
Re: Bullet seating depth?

Quote:
Originally Posted by Reloader222 View Post
Got to the following site for a cheap effective way to determine the best OAL for your rifle:
Innovative Technologies - Reloading Equipment

Go to Reloading and Shooting Tech Tips and then to Best OAL.
THANK YOU!

I really appreciate tips on awesome and affordable reloading stuff.
the funny thing is that I would be lying if i said that i shot long range - but i have the most "accurate" out of the box Savage model 14 Euro Classic 308 I have ever seen - and it is from 'anal-yzing' all the variables

thanks again RL222 and have a great day!
jsd
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  #19  
Old 01-23-2013, 03:38 PM
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Join Date: Aug 2010
Location: Phoneix
Posts: 39
Re: Bullet seating depth?

Wow, I know I post among giants when a 3/4" group @ 100 yrds is ho hum and 5 into a quarter sized hole at 100 yrds is not really considered good enough. Seriously, I am impressed.

As for C.O.L I agree on what has been said here and that the Hornady or other chamber length gauge is an important tool for working up loads truly customized not only to the rifle but to the bullet being loaded in a particular rifle.

In "Getting the Best Precision and Accuracy from VLD bullets in Your Rifle" Berger recommends the following:

Load 24 rounds at the following COAL if you are a hunter (pulling a bullet out of the case with your rifling while in the field can be a hunt ending event which must be avoided) or a competition shooter who worries about pulling a bullet during a match:
  • .010 off the lands (jump) 6 rounds
  • .050 off the lands (jump) 6 rounds
  • .090 off the lands (jump) 6 rounds
  • .130 off the lands (jump) 6 rounds
This is the procedure I have been following using 5 rounds (they fit in a standard ammunition box better) with good success. I use this method for all bullets manufacturers, not just Bergers. Note that success for me is 1 MOA, so if 3/4 is just ho hum for you, you may need to work within the 0.04 increments. PM me if you would like a copy of the Berger article.

I disagree with the comment about not "wasting money" on a chronograph and "backing into" the numbers using a load book. IMHO this sounds like a technique subject to large error and penny wisdom when pounds matter. A chrony is about $200 from Dillon http://www.dillonprecision.com/#/content/p/9/pid/24728/catid/32/CED_Millenium_Chronograph and with $3000 rifles and $1500 scopes the norm for what is advertized on this site, $200 for a tool seems small change for someone really interested in long range accuracy. I find also fine it important to remember that BC is an estimate as well as an average over various velocities. Read the back of your Sierra loading manual for a good introduction to the problems/issues with BC. Only real live range tests with your gun and your loads matter.

Great discussion and happy shooting to all.
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  #20  
Old 01-23-2013, 05:01 PM
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Join Date: Sep 2012
Location: australia
Posts: 24
Re: Bullet seating depth?

Quote:
Originally Posted by MtPockets View Post
So, I finally got around to working up some coyote/wolf loads for my .270. I'm going to try the 110 Vmax and a 90 gr Sierra hollow point.
I started with the Vmax, but when I seated the bullet to the length specified in the Hornady book (3.165") it's not even CLOSE to the cannelure. I was always under the impression that you seated the bullet to (or even over) the cannelure. What gives?
I then switched to load the 90 Sierra's. Although there's no cannelure to go by, when seated to what the Sierra book calls for (3.200"), it's only into the case by .172". Is that correct?
Gday I use the 90gr sierra in my tikka t3 270 and at 3.200 oal it was getting rifling marks on projectile after using a oal gauge it was 2.275 at the orgive and my oal cartridge length was actualy3.183 on the lands.
So I seated them at 3.170 oal had them loaded with 60gr of ar2209/h4350 and they are deadly accurate.
Maybe different in your rifle so start a grain or two less this is not a max load but best to work up just to be safe.
winchester brass,fed 210 primers.
Also have used 110 vmax havnt spent much time with them last test was 54.5gr of 2209/h4350 this is mild load with 1/2 inch groups im sure they could be better with some work.
Cheers
Rumball.
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  #21  
Old 01-23-2013, 07:35 PM
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Join Date: Jan 2013
Posts: 6
Re: Bullet seating depth?

Bullets of the same caliber are different, as is the gun itself.
The olgave of the bullet is the largest part.
I always allow the bullet to seat where the olgave is resting in the lettie which is
just before the rifling.
The bullet is now positioned where it does not jump from the casing into the
rifling, you will see a great difference in accuracy.
I use a dummy round which I put a slight crimp just enough to hold the bullet
secure.
I then chamber the round very slowly pushing the bullet into the casing util the
the olgave makes contact with the rifling.
I slowly eject the dummy round and mark it, you now have a round that is
ideally seated.
The next thing you do is seat the bullet so very slightly further back into the casing
Don't forget the first mark you made, this is your reference point.
Give this a try you notice your accuracy has improved,
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