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Forum Index > Rifles general discussion > Remington 700 COAL Excessive?

Remington 700 COAL Excessive?

22 Aug 2015
@ 04:26 am (GMT)

Todd Free

I have checked the COAL of my rifle using the peg and rod method 5 times and averaged it using a 150gr Nosler BT .308 bullet.

3.48" Max COAL

For the load I was intending to use calls for a COAL of 3.25" Thats about 5.9mm of bullet jump.


Replies

22 Aug 2015
@ 07:26 am (GMT)

jason

Re: Remington 700 COAL Excessive?
If the load your intending to use is from a reloading manual. There coal is suppose to fit into any rifle safely.
You can take a ogive to lands or coal measurment of your rifle if you like, and is a good idea. But I'm pretty sure being a .308 you will end up seating for concentricity anyway. Which is on this website. It's basicly seating until the bottom of the projectile is flush with the bottom of the neck. As the .308 has a long throat.
A big jump doesn't mean it won't be accurate. But if it's seated only just in the neck you run the risk of the rounds not being very concentric which isn't good for accuracy.

As always work up slowly and ask if your not sure. Hope that helps
22 Aug 2015
@ 07:32 am (GMT)

Todd Free

Re: Remington 700 COAL Excessive?
The load is from a manual. I will just seat for concentricity and see how it goes.

Cheers.
22 Aug 2015
@ 07:34 am (GMT)

jason

Re: Remington 700 COAL Excessive?
Oh. Check mag length too. You want about 40 thou room for smooth feeding.
22 Aug 2015
@ 07:35 am (GMT)

Todd Free

Re: Remington 700 COAL Excessive?
Lots of room in the magazine.
22 Aug 2015
@ 07:38 am (GMT)

jason

Re: Remington 700 COAL Excessive?
Yeah. Those manual loads are Sami spec. Sami stands for something I forget. But means safely fit in any rifle. But what you are doing is making a custom load, as you can because you have found your lands.
22 Aug 2015
@ 07:40 am (GMT)

jason

Re: Remington 700 COAL Excessive?
Quote:
Lots of room in the magazine.


I thought there would be but can't hurt to mention it.

22 Aug 2015
@ 12:34 pm (GMT)

Mike Neeson

Re: Remington 700 COAL Excessive?
Hi Todd, I not so recently replaced my barrel and the smith cut a tight SAAMI spec chamber with a short throat - bloody awful. It was very finnicky. I had him cut the throat out longer for me and it's starting to shoot well now. The 308 really does benefit from a long jump.
22 Aug 2015
@ 11:13 pm (GMT)

Todd Free

Re: Remington 700 COAL Excessive?
Were you able to determine an optimal jump?
23 Aug 2015
@ 01:06 am (GMT)

Thomas Kitchen

Re: Remington 700 COAL Excessive?
hi guys this subject comes up regularly regarding 308win.

you don't need to worry about coal and jump have a read of this forum. http://www.ballisticstudies.com/Resources/Discussion+Forums/x_forum/18/thread/6562.html

depending on mag length you either seat 1mm shorter or bottom of projectile/boat tail to bottom of case neck
25 Aug 2015
@ 01:17 am (GMT)

Mike Neeson

Re: Remington 700 COAL Excessive?
The "bottom of the projectile to the bottom of the case neck" may be problematic if using light, short projectiles. You are just aiming to have as much of the bearing surface of the bullet supported in the neck without pushing the ogive into the neck.
 

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