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6Dasher Long Neck from 6x47L?

Been giving thought as to whether or not it would/could be worth it to do a custom Long Neck Dasher in the name of protecting the throat a little for for high volume colony/varmint shooting (plus more forgiving to shoot wider range/length of bullets). For competition I'd simply stick with with 6BRA, but with regular Dasher I'm able to push the 87 Vmax 3500 fps, though I'm concerned about barrel life with the silly short neck. I think/believe a longer neck would help protect throat and extend barrel life...though I'm not sure how much. I liked the idea of the Norma/Shiraz long neck Dasher...just don't like Norma brass. So my thought...why not form long neck Dasher brass from Lapua 6x47 brass (and of course have a reamer made up accordingly)...maybe even leave the neck EXTRA long. Could even push the shoulder back .030 from the standard Dasher since extra capacity would be gained by the longer neck to ideally end up with similar overall capacity as the Dasher (I'd prefer not to end up in the "finicky" zone when capacity goes above the Dasher). Time consuming project, but after a day of forming and trimming large batch of brass, you'd have a lifetime of firings with Lapua brass...and hopefully improved barrel life with ability to handle wider range of bullets given the longer neck.
 
I think you'd end up pushing a powder slug down the bore (against/with the bullet).
This, adding recoil, muzzle pressure, and doing nothing 'good' for burn consistency.
It's counter to a significant function of Ackley improving, which is to contain more pressure in the chamber instead of somewhere down a bore.
You'll also be producing and dealing with a donut from hell.

Then, what evidence is there that a longer neck would actually protect a throat?
More powder passing through a throat isn't going to help.
 
I think you'd end up pushing a powder slug down the bore (against/with the bullet).
This, adding recoil, muzzle pressure, and doing nothing 'good' for burn consistency.
It's counter to a significant function of Ackley improving, which is to contain more pressure in the chamber instead of somewhere down a bore.
You'll also be producing and dealing with a donut from hell.

Then, what evidence is there that a longer neck would actually protect a throat?
More powder passing through a throat isn't going to help.
I was not aware a longer neck caused this (a powder slug to follow the bullet down the bore).Do you fee this is the result of having a longer neck, or is it when you have a longer neck with powder filling it up?

How long of a neck would be open for discussion, but at very least, a good/regular length neck akin the standard 6BR/BRA would seem advantageous.

As for evidence longer neck helps extend barrel life, there's no "evidence" with any of this stuff of course. But seems many/most find better barrel/throat life with longer necks versus shorter necks. I certainly don't think the ultra short neck of the Dasher helps the throat any...I personally sure wish it had a longer neck anyhow.
 
Sounds like the “long dasher” that was discussed here quite a bit some years ago.

What length barrel are you using to get 3500 fps with the 87 V Max?
Yeah, just a longer neck dasher. Or at least a Dasher with a more regular sized/length neck.

28" barrel with AA2700 gets me up to around 3,540fps before I start to feel a little tension when lifting the bolt and extracting. I'm still doing load development, but hope to find a node in higher 3400s.
EDIT/Correction: I get that velocity with AA2520, now 2700.
 
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I was not aware a longer neck caused this (a powder slug to follow the bullet down the bore).Do you fee this is the result of having a longer neck, or is it when you have a longer neck with powder filling it up?
I was assuming the same seated bullet bearing and a full case.
Maybe that wouldn't be the case.

Powder in a neck burns like powder at the top of column with narrow shoulders. Dead last.
That is, unless you employ front ignition.
 
I was assuming the same seated bullet bearing and a full case.
Maybe that wouldn't be the case.

Powder in a neck burns like powder at the top of column with narrow shoulders. Dead last.
That is, unless you employ front ignition.
Right. I simply hadn't given much thought to this. Thanks for your input.

In the end, I suppose I won't bother with such a project...but sure like the idea of a longer neck on the Dasher. But I guess that's where the BRDX or BRA comes in to play, with just a bit less velocity.
 
..

As for evidence longer neck helps extend barrel life, there's no "evidence" with any of this stuff of course. But seems many/most find better barrel/throat life with longer necks versus shorter necks...
I think there's a correlation between choosing/building such a chambering, and the way it's loaded. Guys that go for such probably won't wring the neck with hot loads, and thus get longer bbl life.
 
Would your long necked Dasher be much different from a 6GT? Don't have a picture of the 6GT to compare.
 
6gt or 6x47l. I can't see that being worth the trouble at all.

I can shoot my 6xc at Dasher velocities and it hammers. I am not sure why people think the only node that shoots well in a cartridge is the upper node. Take the larger case and use a faster powder and shoot it slower.
 
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i am not sure why you think a little longer neck is going to stop/slow throat wear.
IMHO throat wear is based on a couple of things, pressure, volume of gases and velocity of gas. 6mm neck on a base 308 case body is pretty assured of high velocity gas, unless you move the neck and throat a couple of inches you got high velocity, high temp and a good volume( not great volume).... but enough.
aint gonna work
going with a lighter bullet at a higher velocity, cures nothing
 
Would your long necked Dasher be much different from a 6GT? Don't have a picture of the 6GT to compare.
Yeah I know the 6GT...been wishing I had gone this route instead of the 6x47L I have for pushing the 105s. But even then, I'll bet
Yes it would. I would like to keep body dimensions of the Dasher and the XC is effectively a split between the Dasher and 6X47L. I'm not saying I wouldn't shoot/get and XC some day, in fact I sure wish I had done so over this 6x47L I have...but I hear, and believe, that going over the Dasher volume you enter the overbore zone that's not only harder on barrel life, but less accurate and more finicky to tune. I'm fairly sure the long range benchrest guys have found ("proven") this.

I think Shiraz had a good idea with the Norma Dasher design...a concept that failed because the brass only held up to a 4 or 5 stiff firings. I still suspect/believe that a longer neck will have better barrel life, but I don't "know" this for sure; at the very least, it would allow for the use of a wider range of bullets. But, it is worth the effort of "making" brass...proly not.
 
i am not sure why you think a little longer neck is going to stop/slow throat wear.
IMHO throat wear is based on a couple of things, pressure, volume of gases and velocity of gas. 6mm neck on a base 308 case body is pretty assured of high velocity gas, unless you move the neck and throat a couple of inches you got high velocity, high temp and a good volume( not great volume).... but enough.
aint gonna work
going with a lighter bullet at a higher velocity, cures nothing
You're probably right. With volume of gas being the biggest factor, by FAR, in my opinion. And then thre is also powder choice...competition "requires" the more consistent extruded/stick powders, but they burn barrels much faster than cooler burning ball powders. As for personal experience, my 6x47 does not shoot well if I exceed 3,030 with 105s, so it's lived life at very temperate pressures/velocities for such a large case, and yet after 500 yards using stick/extruded powders, the leade growth and firecracking is akin to what I typically see in my "varminting" 6BRs after about 3,000-4,000 rounds using ball powder (that's no exaggeration by the way). In fact, this week I fired 3 zeros in a row with my 6BR bench gun using 66gn match bullets on a barrel that has over 3,000 rounds using (ball powder).
 
Yeah I know the 6GT...been wishing I had gone this route instead of the 6x47L I have for pushing the 105s. But even then, I'll bet

Yes it would. I would like to keep body dimensions of the Dasher and the XC is effectively a split between the Dasher and 6X47L. I'm not saying I wouldn't shoot/get and XC some day, in fact I sure wish I had done so over this 6x47L I have...but I hear, and believe, that going over the Dasher volume you enter the overbore zone that's not only harder on barrel life, but less accurate and more finicky to tune. I'm fairly sure the long range benchrest guys have found ("proven") this.

I think Shiraz had a good idea with the Norma Dasher design...a concept that failed because the brass only held up to a 4 or 5 stiff firings. I still suspect/believe that a longer neck will have better barrel life, but I don't "know" this for sure; at the very least, it would allow for the use of a wider range of bullets. But, it is worth the effort of "making" brass...proly not.

Get you some AR COMP and try my load in your 6x 47l. Start at 34 grains. Shoot start at 33 grains!! You can use TS 15.5 also.

Just pretend it's a Dasher.

This is not speculation. I've tested it.
 

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