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Chambering the 338 Edge

 
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  #1  
Old 12-07-2011, 09:33 PM
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Location: Bettles Field, AK
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Chambering the 338 Edge

I'm building an Edge on a M70 action. It's soon to be barreled and chambered so now's the time to address this conundrum: Some of the hand loads, admittedly from individuals as applied towards their specific rifles, show COALs up to 4.00. These shooters are no -doubt purposely loading to these over-COALs to set their (ULD, VLD) bullet ogives a tested length that shoots best in their rifle (s). Kevin Wyatt of Wyatt's states that 3.85 is max length for the M70 using his MBE-8 magazine box. Is it possible to begin the rifling at a shorter length than normal (unknown what SAAMI chamber specs are for the Edge) so as to work from this--3.80--COAL? I'm thinking that there's enough powder capacity to begin testing at the usual lesser-than--maximum and work up to similar velocities with the same bullets as say a "normal" COAL?
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Old 12-07-2011, 11:57 PM
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Re: Chambering the 338 Edge

Quote:
Originally Posted by alcesgigas View Post
I'm building an Edge on a M70 action. It's soon to be barreled and chambered so now's the time to address this conundrum: Some of the hand loads, admittedly from individuals as applied towards their specific rifles, show COALs up to 4.00. These shooters are no -doubt purposely loading to these over-COALs to set their (ULD, VLD) bullet ogives a tested length that shoots best in their rifle (s). Kevin Wyatt of Wyatt's states that 3.85 is max length for the M70 using his MBE-8 magazine box. Is it possible to begin the rifling at a shorter length than normal (unknown what SAAMI chamber specs are for the Edge) so as to work from this--3.80--COAL? I'm thinking that there's enough powder capacity to begin testing at the usual lesser-than--maximum and work up to similar velocities with the same bullets as say a "normal" COAL?
When building a rifle for a specific bullet you run the risk of it not liking that bullet and you are
stuck.

I recomend chambering to SAMMI specs. and tuning the load to the rifle. I am one of those people that have no fear of free bore. In fact I like it because almost any bullet can be made to shoot
very well and pressure is not an issue so most of the time higher velocity is achieved because of it.

Accuracy is also not an issue with free bore as long as head space is minimum (.000 to .001)

I am in the process of testing a new cartrige and it has .100 thousandths of free bore and durring
break in it was shooting 5 shot groups .381 and after break in it had dropped to .171 5 shots @ 100
yards. These are fire form loads and and the cases are being expanded from 115 grains capacity
to 122.3 grains. (an increase of 7.3 grains) and these loads are magazine length( 3.810 COAL).

So my advice would be to chamber to a SAMMI standard and work up loads for the rifle.

J E CUSTOM
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Old 12-08-2011, 12:08 AM
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Re: Chambering the 338 Edge

Who has more experience with the 338 edge then Shawn at defensive edge and he seats his at 3.785 coal
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Old 12-08-2011, 01:15 PM
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Re: Chambering the 338 Edge

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Originally Posted by bassin93 View Post
Who has more experience with the 338 edge then Shawn at defensive edge and he seats his at 3.785 coal
Probably no one.

But he has reamer spec,s of his own and probably uses a particular barrel that works for him.

Slight differences in reamer dimensions make huge differences in performance on different
bullets.

Also he has his way of setting the rifle up that can vary from other smiths.

The seating depth depends on many things, so just to say seat your bullets @ 3.785 would be
miss information and could lead to problems if the rifle is not set up the way he does it.

This is no difference on any rifle.head space, throat depth. lead angle. bullet type, load type
and pressure required to achieve a targeted velocity, all come into play.

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Old 12-08-2011, 02:50 PM
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Re: Chambering the 338 Edge

Thank you both. So I should ask what the COAL is/as machined into the barrel (chamber size)? That makes sense.
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  #6  
Old 12-09-2011, 12:07 AM
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Location: Libby, MT
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Re: Chambering the 338 Edge

buy the reamer from PTG for the spec you want, they have several prints that they will send you and then you can make up your mind which reamer with the different throats you want for your coal.

Last edited by bassin93; 12-09-2011 at 01:14 AM.
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  #7  
Old 12-09-2011, 12:23 AM
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Re: Chambering the 338 Edge

There is nothing wrong with loading to magazine length so long as the bullets shoot. I have found with the new Bergers that I can not.
With this bullet I must have them into the lands when using Retumbo.

For the person with a .338 Edge that single loads, there are changes ahead that may make for some interesting times.

Look for some advances over the next six months that will provide for significant change.
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