Favorite 6MM Build

[Forum Boss]

Shiraz,

I shoot the 6BRDX which has a slightly longer neck than Dasher. I can hit the 3030 FPS node with 105s no problem, and I like having the extra neck -- easier to play with seating depth and chase lands if needed.

That said. The answer is a STRETCH DASHER -- Just like a Dasher but make the neck longer.

1. Existing Dasher shooters can just trim the brass
2. BRDX Shooters can push the Shoulder back.
3. Guys getting started with a mid-range cartridge can shoot it full-length (with longer neck), and use the extra length to chase the lands, or load longer (and perhaps shoot the 115s).

 

[Rtheurer]

Great Idea!!!! Love it.

 

[BradY]

Make sure you send some down under!

 

[Keith Glasscock]

Yes! Dasher brass that is long necked.

Shiraz, Sorry I missed the match today. I would have given you the brass on the spot.

 

[expiper]

good idea,,,then we can "double" dasher it and get just a lil more case capacity,,,!!!..Roger

 

[Phil]

A neck thickness of .015 would be awesome,that way all reamers can take advantage,although most would have to neck turn.

Also a minimum of 1.555 case length......


Just dreaming....... :

 

[Savage99]

For 200 yd. target shooting slow fire from 3 or 4 positions I found the 30-06 that everyone else used to kick harder than I wanted.

I ordered a new M70 Varmint (26" heavy bbl.) in 1957 chambered for the .243 and I did very well with it using reduced loads.

Thus I ordered a new 40X in 6mm Rem. Intl. which is a 250 Sav. with it's shoulder pushed back and a long neck. I loaded the 75 gr Sierra over a light load of 3031. That was a winning combination.

What it took to win was superior aiming and not rifle accuracy.

I only mention it as historical fact. Today I might choose the easiest to get small 6mm which may be the 6mmBR?

Here is my 40X with a test scope on it. Those matches are shot with irons.

 

[Shiraz]

Shiraz,

That said. The answer is a STRETCH DASHER -- Just like a Dasher but make the neck longer.

Paul - its a good idea. We have Dave Kiff's Dasher reamers in stock and will review the reamer print to see how long the neck is on the reamer, versus fire-formed brass. I suspect not as long as what you are thinking.

 

[Erik Cortina]

Shiraz,

That said. The answer is a STRETCH DASHER -- Just like a Dasher but make the neck longer.

Paul - its a good idea. We have Dave Kiff's Dasher reamers in stock and will review the reamer print to see how long the neck is on the reamer, versus fire-formed brass. I suspect not as long as what you are thinking.

Shiraz, you would have to start with longer brass to achieve a longer neck. I think that's what the Boss was trying to say. If you are going to have brass made, just spec it with a longer neck and create a new cartridge.

 

[Shiraz]

Shiraz, you would have to start with longer brass to achieve a longer neck. I think that's what the Boss was trying to say. If you are going to have brass made, just spec it with a longer neck and create a new cartridge.

Yes, of course, but what I want to check is does Kiff's Dasher reamer already cut a longer neck. If it does then you simply need longer necked brass like Paul is saying. Otherwise its a whole new cartridge ("DashX" - I really like the sound of that!), with specific new reamers required. Either case, his idea's a good one.

One more thought along those lines - for all the existing Dasher users wanting to use the new longer necked brass they can have their gunsmiths simply use a neck reamer and make the neck deeper within the existing chamber. Then use a throating reamer to extend out for the bullet to be used. This would eliminate having to trim the longer brass, and turn their Dasher into the DASHX. I am loving this idea as I type this!

 

[Rustystud]

It has been my experience with both the dasher and BRX when you fire form the cases shrink about .010" to .015' Rarely has a Dasher or BRX been a trimming issue cartridge.

I recommend fire forming either o these cartridges ve h20 forming as Lapua brass is not ductile enough and you need the heat to keep the brass from splitting at the web.

Nat Lambeth

 

[m500]

There is a possibility that Lapua may have trouble making brass with a 40 degree shoulder. Things become more complicated once you go steeper than 30. If they can't make dasher brass, then consider making long necked brx brass. Something like 1.700 long. Then we could headspace it on the neck-shoulder junction and blow it out like an ackley without jamming or false shoulders. You don't have to make brass for a specific case. They can be sold as basic brass. They could also carry a 6mm grizzly headstamp.

 

[Steve Blair]

There is a possibility that Lapua may have trouble making brass with a 40 degree shoulder. Things become more complicated once you go steeper than 30. If they can't make dasher brass, then consider making long necked brx brass. Something like 1.700 long. Then we could headspace it on the neck-shoulder junction and blow it out like an ackley without jamming or false shoulders. You don't have to make brass for a specific case. They can be sold as basic brass. They could also carry a 6mm grizzly headstamp.

[br]
WSM brass is 35°, 6.5-284 and .284 Win are 35°, and then there's this. [br]
http://www.midwayusa.com/product/128050/nosler-custom-reloading-brass-280-remington-ackley-improved-40-degree-shoulder-box-of-50

 

[m500]

Yes, I am aware of those. In this instance however, I'm thinking more shooters could be better served with long necked brx brass, because it could also be used in existing dasher chambers with only a very slight shoulder bump and trim. The cases would not shorten as much if headspaced on the shoulder. It could also be used as a dash-x (as Shiraz mentioned) or for the brbs ( Shehane). I think this will be great no matter what Shiraz decides. Either way, there is no reason not to make the necks longer.

 

[Steve Blair]

Either way, there is no reason not to make the necks longer.

[br]
Agreed.

 

[expiper]

or,,,Lapua culd make the 6mm BR brass ,.100 longer,,,then it would hav a long neck and also culd be dasherized ,,,,this idea went around about 10 yrs ago and Lapua refused to do it,,,Roger

 

[dkhunt14]

If you made the neck longer like the 6 Br you would have barrels last a lot longer. I see some guys shooting 10 sighters and then they shoot there 10 records in 12 to 15 seconds. I have seen Dasher barrels go in 300 to 500 rounds and seen some go to 1500. That short neck can be hard on throats. My gunsmith which shoots nothing but Dashers had Kiff grind a long neck Dasher to make out of a 243 case and figured a lot of work to shorten them. Matt

 

[nosualc]

Personally, I think the difference between a Dasher and BRX is academic. If factory brass were available for either one, it would tip the scales in that direction 100%, and the other would fade to obscurity.

I'm a BRX guy, had success with it, but would switch in a heartbeat (once my BRX barrels were all gone) to Dasher if good factory brass (e.g. Lapua) were available.

-nosualc

 

[DennisH]

Personally, I think the difference between a Dasher and BRX is academic. If factory brass were available for either one, it would tip the scales in that direction 100%, and the other would fade to obscurity.

I'm a BRX guy, had success with it, but would switch in a heartbeat (once my BRX barrels were all gone) to Dasher if good factory brass (e.g. Lapua) were available.

-nosualc

I agree with the above.

 

[dkhunt14]

If you shoot the BRX and the Dasher In 1000 yard benchrest you would see the difference. From what I have seen everybody that tried the BRX went back to the Dasher. The Brx shot good but not as good as the Dasher in conditions. Matt