6 Dasher with 115 DTAC

[savagedasher]

I didn't say that, alf did.

3070 though. That's screaming. IIRC you're running H4350 right? 105 hybrid?

Yes H4350 with a30" barrel Larry

 

[upSLIDEdown]

Yes H4350 with a30" barrel Larry

Right on. I'll be running a shorter barrel, in the 24-26" range most likely. And I want to try dtacs. We'll see what happens I guess.

 

[savagedasher]

Right on. I'll be running a shorter barrel, in the 24-26" range most likely. And I want to try dtacs. We'll see what happens I guess.

4350 could be too slow . With 4350 you get 95 percent of bullet speed in 17" of the barrel
Varget And others it is done in 10" .
Best of luck Larry

 

[upSLIDEdown]

4350 could be too slow . With 4350 you get 95 percent of bullet speed in 17" of the barrel
Varget And others it is done in 10" .
Best of luck Larry

Yeah I shoot 4350 in my 6.5 Creed currently with great results. I may be PMing you in the future to pick your brain a bit regarding fast 105 loads in my dasher, especially if I can't get the 115s moving fast enough.

 

[savagedasher]

Yeah I shoot 4350 in my 6.5 Creed currently with great results. I may be PMing you in the future to pick your brain a bit regarding fast 105 loads in my dasher, especially if I can get the 115s moving fast enough.

Any time Larry

 

[ASbobcat]

Have to say, feel your selling the DTAC's short when your subtracting 150-fps for only 10-grains in bullet weight, in comparison to Hybrids.
From my experience 2900-fps is a cake walk for 115's from a 6Dasher. Was shooting them +2950-fps with RL15 many moons ago when they first came out (2005). And +3000 from RL17 when it first came out (2009), but settled at 2980-fps for best accuracy for the half of a season I used them with RL17.
Took them to 1-mile in 2006 with 32.8-gr of RL15 that took 77-MOA of elevation on a 55-F morning at 1310' if you want to run some reverse ballistics.

I to read the mixed reviews of the Shiraz/Norma brass. Almost all the negative and skeptic seem to come from people who haven't tried them, or so is what notice and stands out to me. They worked good for me right out of the gate with no hick-ups or wrecked cases that showed great potential to longevity, accuracy, and velocity potential. But did decide to finish the season on Lapua's and will decide which for my future use at a later date, but I will likely use both brands for a while. The advantages of the long neck is intriguing.

Good luck with your short barreled Creedmoor. Most everyone I know that has one likes it !.!.!
Donovan

Donovan,

As far as the "negative skeptics", "Any reasonable man learns from his own mistakes, but a truly wise man learns from others mistakes"-(unknown WWII German general). Especially when the "mistakes" cost $1.10 a pop, and many who have tried them have suggested known issues. Even proponents like you are still undecided whether it's better than Lapua.

Please let us know when you decide.

Thanks,

Bob

 

[ASbobcat]

To get the most velocity potential from the new 115-DTAC (closed tip) from a 6Dasher, I myself would setup with the new Shiraz/Norma 6Dasher brass, taking advantage of the longer neck, to then seat the new DTAC forward in the longer neck. Then have a reamer throated to that longer bullet placement which will gain capacity under the bullet over Lapua made 6Dasher's.

Then I would plan on slower burning powders and would go at RL16, IMR4451, or RL17, which all 3 will be complimented by the capacity gains of the new 6Dasher brass, with ability to drive the heavier/longer bullets faster then ever possible in Lapua made 6Dasher's.

For a barrel, I would use a 7.5-twist or faster barrel to gain a little BC over an 8-twist, and plan on finishing at 32" or even 33", to gain some speed from the extra length. And choose a barrel mfg that offers narrow/skinny lands so that it is a fast barrel (probably a Brux).

My 2-Cents
Donovan

If you aren't going to use the whole neck, why not just shoot a 6BRX from Lapua brass? You would end up with a LOT more capacity, as the new Shiraz/Dasher brass does not appear to have any meaningful difference in capacity versus a standard 6BR. If, as you claim, there are capacity gains in the new Norma brass, why are you trying to squeeze more powder into the neck? I thought the whole point of the new brass was to restore the long neck.

One of us is confused.

Bob

 

[jaygorski]

And the brand new DTAC's have about .025" more bearing surface than the old ones.

Make that .009". New on left, old on right. Avg 0.5808, 0.5892

 

[Grimstod]

Some things about powder burn speed.

Heavier bullet = slower powder needed
Greater overbore ratio = slower powder needed
The inverse is also true.

 

[savagedasher]

Some things about powde burn speed.

Heavier bullet = slower powder needed
Greater overbore ratio = slower powder needed
The inverse is also true.

Shorter the barrel faster the burn also.Larry

 

[JDMock]

Hey guys, I'm building a 6 dasher for tactical competitions and was wondering about bullet choice. Barrel is going to be finished at 26". I'd like to run the DTAC for the better BC but I'm wondering if the little dasher case will even have a chance to push a 115 to 2900ish in a 26" tube. I'm just looking for thoughts, opinions, and first hand experience. Thanks!

I had a chance to try David Tubb's new 115 gr. RBT in my Dasher and was well pleased with the results. James Mock

 

[birdog]

Looks like it works. My new DTAC's have arrived. Hope to try them soon

 

[letronshootit]

I had a chance to try David Tubb's new 115 gr. RBT in my Dasher and was well pleased with the results. James Mock
View attachment 988696

JD, I had similar results with my first load work up yesterday in my 7.5 twist Bartlein Dasher and the new 115 DTACs. I used 32gr varget and it was good for groups mid 1s to mid 2s at 100yds early am before wind and mirage came into play. I used naked over coated bullets since 105 hybrids are used in this gun or at least were. I needed heavier bullet in 6mm family for wind at 1k

 

[dmoran]

If you aren't going to use the whole neck, why not just shoot a 6BRX from Lapua brass? You would end up with a LOT more capacity, as the new Shiraz/Dasher brass does not appear to have any meaningful difference in capacity versus a standard 6BR. If, as you claim, there are capacity gains in the new Norma brass, why are you trying to squeeze more powder into the neck? I thought the whole point of the new brass was to restore the long neck.

One of us is confused.

Bob

If you aren't going to use the whole neck, why not just shoot a 6BRX from Lapua brass?
Better re-read what I posted. I wrote "taking advantage of the longer neck", hence meaning using it and gaining capacity (behind the bullet) by doing so.

as the new Shiraz/Dasher brass does not appear to have any meaningful difference in capacity versus a standard 6BR
Looks to me like your confused and should investigate the capacities more in-depth. The Dasher's hold roughly 3-grains more then a standard 6BR case.

One of us is confused.
Your lack of hands on experience with the Shiraz/Norma 6Dasher brass is what I see as your confusions.

Seems to me your already convinced that Lapua made 6Dasher's are the better option, which you have clearly stated. So why not just go with that for yourself, and stop taking inputs out of context and badgering the Shiraz/Norma brass, users, and inputs.

 

[ASbobcat]

If you aren't going to use the whole neck, why not just shoot a 6BRX from Lapua brass?
Better re-read what I posted. I wrote "taking advantage of the longer neck", hence meaning using it and gaining capacity (behind the bullet) by doing so.

as the new Shiraz/Dasher brass does not appear to have any meaningful difference in capacity versus a standard 6BR
Looks to me like your confused and should investigate the capacities more in-depth. The Dasher's hold roughly 3-grains more then a standard 6BR case.

One of us is confused.
Your lack of hands on experience with the Shiraz/Norma 6Dasher brass is what I see as your confusions.

Seems to me your already convinced that Lapua made 6Dasher's are the better option, which you have clearly stated. So why not just go with that for yourself, and stop taking inputs out of context and badgering the Shiraz/Norma brass, users, and inputs.

Your postings are self conflicting nonsense and I will continue to bring your inconsistencies to the attention of our fellow members as a service to them so that they may make up their own minds.
They will decide which one of us is confused.
I specifically suggested, that it appeared from the input of other members, the Shiraz/Norma Dasher case has about the same capacity as a standard Lapua 6BR. And I also acknowledged that a Dasher made from Lapua brass has about 3 grains more capacity than either. You are the one who can't read, who is biased and who continues to misrepresent my statements!

I will continue to ask questions, because your comments only bring up more questions.
"If you smell something, say something."--John Stewart (The Daily Show)
"And the truth shall set you free."

 

[dmoran]

Your postings......

Wow..... got to say, knock yourself out with all that !.!.!

But to offer you some insight, took a picture to aid you with your capacity confusion:

Left = a new, never fired, 6BR case
Middle = a new, never fired, Shiraz/Norma 6Dasher (trimmed from 1.598 to 1.560")
Right = a fire-formed to 6Dasher from Lapua 6BR



With mine, the Shiraz/Norma 6Dasher's start out new around .9-tenths (2.5%) less then fire-formed Lapua's, but after they also are fire-formed in my barrels/chambers, they are with in 1% capacity of the Lapua's. Both of which hold roughly 8% or 3-grains more then a 6BR case.

 

[dmoran]

Left = 1.598" length S/N case, with a old 115-DTAC seated to 2.518" OAL
Right = 1.550" length Lapua case, with a old 115-DTAC seated to 2.470" OAL



Pictured to show how "taking advantage" of the .048" longer neck to the S/N 6Dasher would offer "more capacity under the bullet" when seating a 115-DTAC the additional .048" (2.518" - 2.470" OAL), hence how to take advantage of the improved neck length of S/N 6Dasher brass, for longer & heavier bullets.

 

[swd]

Those non pointed DTAC's have been waiting around a while.

 

[ASbobcat]

Left = 1.598" length S/N case, with a old 115-DTAC seated to 2.518" OAL
Right = 1.550" length Lapua case, with a old 115-DTAC seated to 2.470" OAL

View attachment 988747

Pictured to show how "taking advantage" of the .048" longer neck to the S/N 6Dasher would offer "more capacity under the bullet" when seating a old 115-DTAC the additional .048" (2.518" - 2.470" OAL), hence how to take advantage of the improved neck length of S/N 6Dasher brass, for longer & heavier bullets.

Donovan,

Thank you for your excellent presentation.
I wish this information had been posted earlier, as it clears up a lot of questions that I had and I'm sure some of our fellow members will appreciate.
I know that the pictures and well organized information took a lot of time and effort to put together.

I believe the Shiraz/Dasher is a great concept and I look forward to reading your future posts as you continue to sort out loads, durability, etc.

Best regards,

Bob