6BRX or Dasher Specs for 600 Yards

[DJ111]

Trying to decide on which caliber to chose for 600 yard shooting league at a local range.

I will be starting from scratch so I will have to purchase new dies with either caliber choice.

I am looking for reamer ideas on either one as I will have PT&G build a reamer for me.

I am leaning towards a no turn or light clean up neck so what would be the diameter I should go with ? .271 ?

Free bore on the Dasher seems .104 works well with 105 vlds, what would it be for the 6BRX?

Any feedback would be great on helping me decide!
Thanks,
Dallas

 

[Bob3700]

It will be strictly opinions on this one but here is mine:

BRX - has the advantage of the same ballistic performance and accuracy using a standard 6 BR die set. No custom dies needed.

Reamer specs - a .272 is a standard no-turn neck and works very well. Freebore as recommended by Kiff for the BRX is .104" for 105-107 gr bullets. So you have similar neck and freebore dimensions with the changes behind the neck.

Take your pick, mine was the BRX.

Bob

 

[Bob3700]

Gunamonth,

I understand that the Wilson die is not hardened and you can run the Dasher reamer in no sweat.

What about that Reading die? Isn't that hardened and you can't take a 6 BR die and just run a reamer into that. I thought you had to purchase the custom Dasher die from Reddiing. Last time I checked with Sinclair, they wanted $130 for the S Type FL sizing die.

Bob

 

[AckleyImproved]

Mate

I shoot a dasher, and love it.

Redding body die, Redding Type S neck die, and either a Redding of Forster Ultra seater will get you through with bullet seating. I would recommend a 25cal tapered expander too for forming a false shoulder for case forming.

0.272" for no turn neck.

Here is the big thing though, freebore. I see a lot of reamers around the 0.110", but I am very near ordering one for myself, which I will get a reamer with 0.140". This will result in getting those VLD/boattails well away from doughnut area, as well as give you the option of trying,hopefully) a slower powder. With a 107 Sierra and a freebore of 0.140", you still end up with a lot of projectile in the case. Of course, this freebore is really designed for the heavy 100grain plus match projectiles.

I would like to hear what guys think of the 0.140" freebore with the dasher. For me, it sounds perfect, and I cant see why it isnt used more other than being aboe to use a greater range of projectiles with the reduced freebore!

Cheers
AI

 

[DJ111]

Guys,
Thanks for the info so far.

How well are the .271 necks working for you or would you stick to .272?

Such a hard choice!

Later,
Dallas

 

[MarkS]

Dallas,

I shot a 6BRX for 600yds. It hold the LG IBS record 0.749". It is a 0.271" no turn neck. The record will fall this year to 0.711" shot by A 6BRX. Mike Davis has chambered a new barrel for the same brx 0.272" neck and made me a F/L die.

Both rounds shoot great, it will not matter, they both work.

If I were starting from scratch, I would pick a Dasher, because of factory dies. Get a Wilson seater reamed and get a Redding "S" F/L die.

But if you are doing your own work, flip a coin, it will not matter.

Mark Schronce

 

[DJ111]

Guys,
Thanks for all your thoughts!

I talked to Dave at PT&G and I am going to go with the Dasher with .272 neck with .104 free bore.

Last question;
Could some one point me in the right direction for dies with part #'s.

And which die will I need for creating the false shoulder.

Thanks,
Dallas

 

[eggman]

Dallas, to form the false shoulder for the 6 BRX and 6 Dasher I use an K&M Expandiron in 25 cal.,25 caliber expanding mandrel) to expand the 6 BR case to 25 cal.then just run it into your bushing die that you are using. This will form the shoulder to hold your case to fireform. I am sure there are other way's to do it but I know this method works and you don't have to purchase much extra.

Rodney

 

[Baron]

Dallas,
Redding 6mm Dasher Full Length Sizing Bushing Die. Sinclair p/n RD77648. Once you expand up to .25 cal you might be better off using a standard Non Bushing/6mm BR Sizing Die to neck back down with. Bushings do not have much of a radius on them and may colapse the neck going from .25 cal to 6mm.
Baron

 

[alf]

I've made over 3500 6 Dashers using a bushing to neck them back down from 25 cal. and have never collapsed a shoulder yet.

Can't say it won't happen, but.......

Al