6mm BR modifications, Something is confusing me.

[Changeling]

Hello to all.
I have been reading a lot about the 6BR cartridge case, and everything I read is great from the original 6BR through different modifications.
The Dasher Modification seems to hold more long distance records than all the others and I have some serious questions as to just why?
Some very dedicated BR guys on this forum have noted that the 6BRX is right up there in speed with the Dasher.

If so then why doesn't the 6BRX contain a better performance record or at least equal to the Dasher?
Does the 40 deg shoulder on the Dasher contribute that much of an advantage?

Finally, why doesn't Lapua just make a 6mm Dasher case with a longer neck? It seems the longer neck is a problem that most BR shooters would love to see fixed.
2nd, why not just make Dasher cases with the dimensions one wants from existing Lapua cases like there 22-250.

Something here just doesn't make sense!

I surely don't mean to offend anyone, these are just my questions/observations.

 

[Alex Wheeler]

The dasher holds more records because more use it than the BRX. Lapua doesn't make it because they already have the whole dasher market with their br brass. I don't see why the dasher needs a longer neck?

 

[MarkS]

Changeling,
First the key to all of his is the quality of the Lapua 6BR brass, THE best made, it and the 220 RUS (PPC brass). Not all Lapua is as good as them.

Like zfastmalibu said More Dasher out there. I have shot a 6BRX for 10years. I shot 3 IBS 600yds records one was small LG gruop in 2007' 0.749" smallest group fired in IBS at the time. One year later it was broken by a 6BRX 0.711". The BRX, and 6BR set alot of around that time. It is the Dasher time now. The Dasher and BRX are equal, it boils down to how good your barrel is. I had a very good one at the time, Keriger 8tw. I'm not doing to change from the BRX, but most likely go with the Dasher today.

I would guess the 6BR has set more 600yds record than any of them. Sam Hall was winning everything with a 6BR in 2007' to 2009', around 2010 stepped up to a Dasher, and started setting records with it.

I like the IMP's because you get more speed with out push pushing the 6BR past max.

When Lapua came out with the 6.5 x 47L, many jumped on a 6 x 47L. It could not run with the 6BR's. I know 5 top level shooter who cut the chambers off and went back to 6BR's. I did a 6XC and cut it of too, so I did not go for a 6X47L.

Mark Schronce

 

[Changeling]

Hi Mark. That was a great answer. Now I can understand things better. I was kinda going by what I saw posted in the 1 K and 600 yd results at different ranges. It did seem that more 6BRX's were being used in the 600 yd range, but in the 1 K range the Dasher was definitely more abundant than anything else. That is what was confusing me.

I don't know what the term IMP's refers to Mark.


To answer zfastmalibu's question I am under the impression that a longer neck would allow one to be able to adjust bullets in or out of the cartridge more to compensate for throat erosion and when using shorter bullets to have sufficient neck length for proper/consistent neck tension.

Thanks guys for responding to my questions.

 

[Erik Cortina]

I don't know what the term IMP's refers to Mark.

It means "Improved", such as the BRX and the Dasher.

 

[Changeling]

I don't know what the term IMP's refers to Mark.

It means "Improved", such as the BRX and the Dasher.

Thanks Eric. I hate abbreviations, so many can mean other things especially to new people.
I'm not new to "Improved cases", by any stretch of the imagination.

 

[johara1]

Mark, that was records then and have surpassed by the Dasher simply because it shoots better. Rodney set a 600 single group record that will be around a while, guys try the BRX at 1000 but i never saw any good results. It is harder to make cases for the Dasher compared the BRX but it's worth it. I never had a PPC. shoot as good as a Dasher at 100 yds. Equipment and components are getting better and so are the barrels and scopes…….. So whats good now will be wiped out by some thing better in the future……. Jim O'Hara

 

[MarkS]

Jim,
I has done very well at 1000yds with my BRX but no records. A few of us were shooting 6br and imps at Hawks Ridge from 2002 to 2006 and doing well. Any given BR imp can run with any other imp. My current BRX will shoot with any, I have had. I changed to 600 because you get to shoot more.

At one time big 30 cal ruled 1000yds. 6mm are running well these days

Mark Schronce

 

[johara1]

Mark, You have to win to shoot more at 1000 and if you shoot both guns you are tired at the end of the day. If you can't win your relays you are right, you don't shoot much…………. jim

 

[MarkS]

Jim,

in 2006 I shot the second smallest group of the day and did not make the shootoff. The smallest was fired in my relay. In 600 yds IBS you shoot 4 - 5 shot targerts per gun.

Mark Schronce

 

[johara1]

Mark, If you win all your relays in 1000 yds., you will shoot 4 targets per gun. That will be 20 shots for record in light and 40 shots for record in heavy, that is more than 600….. Expending a lot of rounds has nothing to do with accuracy,but as i pointed out you will shoot a 1/3 more at 1000yds. as compared to 4 target aggs. at 600. ….. Tom, it's the total concentration and dragging your your stuff back and forth 8 times…….. I use Kelbly triggers they go down to a 1/2 oz…… jim