6 Dasher with 115 DTAC

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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

Sorry, I wasn't clear. The Creed is what I shoot now. The Dasher is going to replace it, so the dasher is what I'll be leaning towards shortening down to 23" or 24". It definitely won't be longer than 26". Running a suppressor makes everything long. Lol. That's why I was so conservative on the velocity of the DTACs. I was also being optimistic with the Hybrid velocity. Just to play Devils advocate. And even at 2900 vs 3050, it has two tenths on that hybrid in the wind department.

 

[rifle48]

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

Donovan
with 28" 8 twist and the old 115 DTAC how many grains RL 16 would you start with?

 

[dmoran]

Donovan
with 28" 8 twist and the old 115 DTAC how many grains RL 16 would you start with?

Myself, from my own Dasher particulars (.160-FB), would start at 34.0 and work up in .3-tenth increments.
Good Luck
Donovan

 

[lbran]

So essentially, I need to stick with 105s. Haha.

The reason I bumped this is I'm building a similar setup. Tactical build, so 32" barrel isn't gonna happen. My 6.5 Creedmoor is 26" plus a can, and I'm thinking seriously about going to 23" for this build, maybe 24".

As far as the brass/chamber setup, seems like from what I've read the case capacity of the Norma is the same or a little less than Lapua brass, so other than the little bit of could gain by loading into the neck, I'm not sure how much of a benefit it would be. I had planned to stick to Lapua brass, mainly because there are so many different mixed reviews on the Norma stuff.

If the BC is what they claim though, and my quick ballistic calc data is correct, if I can push hybrids to 3050, which is optimistic, and the DTACs to 2900, the DTACs still give me an edge on wind by .2 mils at 1000...

in my experience don't go by bc and data, go by testing!!!!

 

[upSLIDEdown]

in my experience don't go by bc and data, go by testing!!!!

Hah, oh I agree. Just trying to get a good estimate on wind numbers to decide if it's worth it to try them. It appears it is as long as I can get them going 2900, which sounds doable.

 

[lbran]

Hah, oh I agree. Just trying to get a good estimate on wind numbers to decide if it's worth it to try them. It appears it is as long as I can get them going 2900, which sounds doable.

yeah, pretty sure that's doable!

 

[jsimonh]

Like to bring this back up. Did you build this rig and get it shooting? I'm in the process of the same thing and trying to decide if I can get the DTACs fast enough with a Dasher to make a difference between them and the 105 Hyrbids.

Still waiting on the Mausingfield but I did end up selling the DTAC's that I had in favor of the Berger 105 Hybrid. I'm going to be running a .2704 neck with a 104 freebore. I think my barrel at 26" will be a better fit for the 105 weight. And a realitively flat trajectory out to about 600 will be a benefit in the tac matches. I also like the fact that there are a lot of vendors that sell the Berger, not just one supplier.

 

[dmoran]

Still waiting on the Mausingfield but I did end up selling the DTAC's that I had in favor of the Berger 105 Hybrid. I'm going to be running a .2704 neck with a 104 freebore. I think my barrel at 26" will be a better fit for the 105 weight. And a realitively flat trajectory out to about 600 will be a benefit in the tac matches. I also like the fact that there are a lot of vendors that sell the Berger, not just one supplier.

Good choice, by my experience, for a .104-FB chamber. When ever I ran the 115 bullets in shorter throats/free-bores, I pressured out early and at lower velocities. My own preferred FB to compliment 115's is .176-FB. And based from my own experience with 115's from years past, I would never consider using them in any standard 6Dasher free-bore of less then .150".
Donovan

 

[swd]

Good choice, by my experience, for a .104-FB chamber. When ever I ran the 115 bullets in shorter throats/free-bores, I pressured out early and at lower velocities. My own preferred FB to compliment 115's is .176-FB in a standard 6Dasher. And based from my own experence with 115's from years past, I would never consider using them in any standard 6Dasher free-bore of less then .150".
Donovan

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

 

[dmoran]

^^^^ Good point, that should be considered as well for the new DTAC !.!.!

Actually, I like longer free-bores all the way around. Even with the 105 class bullets, I get less pressure and more velocity from longer free-bores. I currently use a .160-FB with 105-VLD's.

Thanks for the added input.
Donovan

 

[swd]

I have a .150" FB reamer and it was a great compromise between the old DTAC and the 105-107 bullets. Easy to use either. Now with new DTAC it's down in the doughnut area especially if your off the lands a ways. I have some of the new S brass and reamer coming and again at .150" it should work with both bullets in the long neck. For everything goes right I'll be testing in a week.

 

[Grimstod]

Thanks for all the info guys. I currently have 16lbs of Varget that I'd like to use. I noticed that nobody in this thread mentioned Varget. Do I need to look at getting something different or will Varget work? It seems Varget is very popular with the 105's

Way to fast a powder. You wont be able to reach 2950 with Varget. That is why every one is recommending slower powders like R15-17

 

[upSLIDEdown]

The reamer I'll be using is a 104FB. Sounds like I need to get my smith to make good use of a throater. Lol

I'll be running at least 105 hybrids, maybe even dtacs. Sounds like more freebore is better, regardless of which one I run.

 

[alf]

I've used nothing but .104" freebores in every Dasher I've owned with 105 hunting VLD's. 28" barrels give me 3060-3075, best accuracy in a couple of 22" barrels was at 2920.

Point your hunting VLD's and you'll be close to the Hybrid BC's. Varget is all I use as well.

 

[upSLIDEdown]

I've used nothing but .104" freebores in every Dasher I've owned with 105 hunting VLD's. 28" barrels give me 3060-3075, best accuracy in a couple of 22" barrels was at 2920.

Point your hunting VLD's and you'll be close to the Hybrid BC's. Varget is all I use as well.

I feel like that's what I've seen in the past, it's 104 is super popular. Seems like lately a lot of people are running a longer freebore with the heavies, and getting less pressure, and in turn more velocity.

 

[alf]

There's no free lunch.....you can't get more velocity w/o more pressure.

If you want to get more speed safely, step up to a 6x47 Lapua. It'll give you 100 fps over a Dasher, and feed smoother to boot.

My 22" 6x47 Lapua's accuracy load runs 105 VLD's at 3030.

 

[upSLIDEdown]

There's no free lunch.....you can't get more velocity w/o more pressure.

If you want to get more speed safely, step up to a 6x47 Lapua. It'll give you 100 fps over a Dasher, and feed smoother to boot.

My 22" 6x47 Lapua's accuracy load runs 105 VLD's at 3030.

I realize that. I'm trying to get a few more rounds from the barrel, hence the Dasher over the 47L.

 

[jsimonh]

Way to fast a powder. You wont be able to reach 2950 with Varget. That is why every one is recommending slower powders like R15-17

Really? I have yet to load so I don't know for sure but I've done a ton of reading and by far the top 2 powders mentioned was Varget and RL15. I'd like to get my hands on some RL16 to see what it'll do, but haven't found any local to me yet.

 

[savagedasher]

I realize that. I'm trying to get a few more rounds from the barrel, hence the Dasher over the 47L.

I shoot my dashers at 3070 how is a 6 x 47 faster . Larry

 

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I shoot my dashers at 3070 how is a 6 x 47 faster . Larry

I didn't say that, alf did.

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