6mm Dasher Brass

[AR Shooter]

Am thinking 6mm Dasher. Have been told can simply fire-form the brass from 6mmBR cases. Is this the way to go?
Thanks.

 

[JigStick]

You can, but you have to create a false shoulder in some way in order to blow it out. You could neck turn the cases down until they "Juuuuuust" fit in your chamber and fire form them.

Or you can create the false shoulder with a die and do it that way. At least this is my understanding.

 

[FatBoy]

At this point I think it's the only route. Until Norma comes through on Bullets.com's order fire forming Lapua seems to be the only game in town.

I'm sure it could be done using Remington brass or from some other parent case but I don't know anyone doing it.

 

[Kyle Schultz]

Am thinking 6mm Dasher. Have been told can simply fire-form the brass from 6mmBR cases. Is this the way to go?
Thanks.

Do a search on "Forming 6 Dasher" and you can spend the next week reading posts. This has been discussed as much as Hillary's e-mails and Obama's forged birth certificate.

 

[stork]

Depending on your neck diameter, you may have to turn necks before, but here's how I did it.

I had mine built with a 272 no turn neck for Lapua brass. I just loaded mine so they jammed the lands about .005 with a light 6br load & shot them at prairie dogs. Everyone came out perfect. Have to say it was the most fun I've ever had fireforming.
Al

 

[johnmyers]

There are members on this site who hydro form. Not a bad way to go

 

[wiuprof]

This is the procedure that I use. I run the virgin brass into a Sinclair die with a .257" expander mandrel. Then put the cases
into my 6 Dasher die to squeeze the neck back down to hold a 6 mm bullet. The false shoulder is visible in the photo.
I then load a "6 BR" load of AA-2230 with a flat base 80 grain bullet.

 

[noload]

Many ways to do it...A Hard jam with lots of neck tension on a standard BR load will work.

 

[moajoe]

Look into hydroforming. I believe there is a company that will take your 6mm BR brass and form it. Heard some guys at the last match discussing this.

 

[LRPV]

Losing brass while forming to a dasher is luck of the draw with either process. Close inspection will weed out the majority of cases that will fail, but some just don't show up or slip through. Just one example, one lot number of blue box 6BR, 300pcs, 3 boxes. 2 of the 3 produced 10 and 11 failed pieces respectively. The third box didn't have a single defect after inspection or a single rupture after hydro forming. It's luck of the draw. I've done it both ways and on average, there's no difference in loss rate.

 

[wiuprof]

I'm not sure what just happened, but I tried to add a photo and my post disappeared! Oh well.
Jason, I had an experience with hydro-forming that was not good. 15 cases out of 200 that split at the shoulder.
The sad part was that the 185 survivors all had rounded shoulders! In other words, they had to be fire-formed anyway.

I have an XP-100 pistol that was chambered with the same reamer as my match rifles. The barrel has a 14" twist, so I
cannot shoot heavies in it, but it's good with lightweight bullets.

 

[shoot4fun]

Losing brass while forming to a dasher is luck of the draw with either process. Close inspection will weed out the majority of cases that will fail, but some just don't show up or slip through. Just one example, one lot number of blue box 6BR, 300pcs, 3 boxes. 2 of the 3 produced 10 and 11 failed pieces respectively. The third box didn't have a single defect after inspection or a single rupture after hydro forming. It's luck of the draw. I've done it both ways and on average, there's no difference in loss rate.

I had the same issue with a particular lot of blue box 6BR brass but I was fire-forming instead of hydro-forming. I thought it was something I did wrong but DJ said he had some of the same issues with particular lots hydro-forming too. Sorry, don't remember the lot number.

 

[LRPV]

If I had something like an XP-100 chambered in a dasher and something fun to shoot at I'd fireformed all my dasher brass just like you do with a false shoulder. There are different methods to forming cases both ways that produce different results. Even when fire forming, the cases still need to be fired again (at least one time after initial fireformed) before I would consider them competition worthy. Same goes for hydro form. In the example I gave, I lost 21/200 in the first batch I hydro formed. The next box of 100 that were the same lot number, I didn't lose one. I've had basically the same attrition rates fire forming. I can hydro form, neck turn, basic prep cases during the winter when I can't shoot. I can fire them one time (with full dasher loads) and they are good to go. I shoot brass that was formed both ways and they both shoot good. Just depends on where/how you wanna spend your time. End result is equal as far as I can tell.

 

[timeout]

Cleaning the brass and chamber with brake clean prior to fire forming seems to limit the split shoulders for me. I prep my brass and then load with the bullets into the lands. I have not tried either hydro forming or false shoulders, so can't say about those methods. On fire forming 6 PPC brass from 220 Russian, some use a light coat of oil on the case. I would not recommend that with the Dasher.

 

[dedogs]

Cleaning the brass and chamber with brake clean prior to fire forming seems to limit the split shoulders for me. I prep my brass and then load with the bullets into the lands. I have not tried either hydro forming or false shoulders, so can't say about those methods. On fire forming 6 PPC brass from 220 Russian, some use a light coat of oil on the case. I would not recommend that with the Dasher.

Why not? dedogs

 

[Barlow]

I put a SMALL amount of case lube on the case bodies, and have not had any issues using the jam method or cow method. But it does take two bangs for them to fully form. Barlow

 

[timeout]

Why not? dedogs

Any oil has equaled more split necks for me. Many more. YMMV

 

[dedogs]

That's good to know as I am thinking of doing a 6 Dasher. Thanks, dedogs

 

[snowpro440]

Get a hold of P1 zombie killer he Hydro forms the brass for you , this will save your barrel life ...

 

[noload]

I would buy my own reamer, I would suggest getting a fire form bbl made with your dasher bbl.( use the same reamer) Very cheap and easy to ream if you use a wornout 6BR barrel.