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Old 01-14-2007, 04:20 PM   #1
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New reloader w/ C.O.A.L. ?

Someone tell me I'm making this new hobby too hard. I'm putting together my first reloaded cartridges. I have LC Match .308 brass, Hornady FMJ-BT 150 gr bullets, 43 grains of H4895, and Winchester LR primers. I think I'm OK there, but when I crimp the brass in the crimping groove on the bullet, my COAL is only 2.702" My Sierra manual gives the length at 2.775" How bad is this? I understand seating depth affects chamber pressure, but is this unworkable?
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Old 01-14-2007, 04:44 PM   #2
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Most bullet makers set the cannelure...the place you crimp the projectile...at different lengths from the bullet tips. You are not doing anything wrong besides using a Sierra Manual with Hornady projectiles. If you are getting past max charges with a different bullet/primer combo and the ambient temperature is nearing 100 degrees and you achieved your load with a different manual then you might be in trouble. I have found in over ten years of reloading that the manuals are lawyer proof and even safe for a pre-WW2 era Mosin-Nagant and modern components. I'm not saying deviate from the manuals...what I am saying is that you are OK
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Old 01-14-2007, 04:47 PM   #3
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Thank you for the quick reply. I guess I needed a little reassurance before pulling the trigger on these first rounds. The Hornady's are just what Scheel" Sporting Goods had on hand. I plan on using Sierra bullets, but they aren't here yet. Thanks again.
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Old 01-14-2007, 09:46 PM   #4
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The cannelure is probably not in the best place, and on many bullets, it's not consistantly located. There's nothing that says you have to use it.

Ty
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Old 01-15-2007, 04:40 AM   #5
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Lurch762,

I don't crimp any of my .308 or .30-06 ammo used in autoloaders. As long as you've got sufficient neck tension, you are fine. The 2.775" COAL listed in the Sierra manual is just the COAL that they used, and is not written in stone. I would nix the crimp and load them as long as you can where they both chamber and fit your magazine.

Don
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Old 01-15-2007, 06:03 AM   #6
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Am I correct in saying that COAL is more a factor in accuracy than in chamber pressure? When I search this subject on different boards or even my manuals, accuracy seems to be all that is considered, not chamber pressure. I feel better. Thanks for the responses.
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Old 01-15-2007, 10:08 AM   #7
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Quote:
Am I correct in saying that COAL is more a factor in accuracy than in chamber pressure?
I would say, Yes, although I think you will find slightly lower chamber pressure when your COAL is longer, as long as you are not touching the leade with your bullet's ogive.

Don
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Old 01-15-2007, 04:05 PM   #8
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Lurch762:

Take a old piece of brass and slot the neck several places to allow a bullet to go in and also to be pulled out (with some force). See picture below!!! Place the bullet you are loading into the brass a carefuly chamber it. Next, carefuly remove the brass with the bullet seated into it now and measure the COAL of it. This should be your MAX COAL for that bullet in that particular rifle! Reduce that dimension by 1000th to 2000th and you should be in the ball park.

Good read on match prep. http://www.hevanet.com/temple/MatchPrep.html

A good comparator is essential in determining this.

See here: http://www.sinclairintl.com/cgi-bin/...TCO&type=store

But the old brass trick work also!!!

Good luck!!

Terry
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Old 01-15-2007, 07:42 PM   #9
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I'l give that try. I like this new flexibility in length that I'm learning.
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