6 Dasher with 115 DTAC

[jsimonh]

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!

 

[Phil]

PM Birdog, he and his friends shot a lot of the 115`s in Dashers.


Jim, johara will be able to steer you in the right direction, as well as dmoran, and MANY others here that are excellent shooters.

This place is an excellent resource for 6 Dasher info.....


Phil.

 

[dmoran]

For me with 115's in my Dasher barrels I ran +2950-fps from RL15, and +3000 from RL17, in +28" barrels.
The new IMR-4451 powder should also give strong velocities for the 115's in a Dasher.
And I believe David Tubbs is working on another 115 class bullet that may be out soon as well.
Good Luck
Donovan

 

[jsimonh]

Thanks guys, Tubbs new bullet is a good part of the reason I'd like to work with the 115 weight.

 

[birdog]

Yes. I shoot more 115's in the Dasher than any other weight. An 8 twist will work with the DTAC but I prefer the 7.5 twist and have made hits on an 18 in plate at one mile.
One day when conditions were perfect I was shooting at 1580 at my prarie dog and ground hog.
I had 20 shells and made 2 hits on Chuckie and 2 hits on Chico. 4 / 20 at 1580 yards.
And you can get 2900 fps plus with the Dasher with RL-15.

 

[alf]

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 run pointed 105 Hybrids, and use a BC of .585" for inputs, which all but equals a 115 Dtac, but you can run them 100+ fps faster.

Tested actual drops to 1400+......

 

[ASbobcat]

I run pointed 105 Hybrids, and use a BC of .585" for inputs, which all but equals a 115 Dtac, but you can run them 100+ fps faster.

Tested actual drops to 1400+......

Wish pointing dies weren't so expensive. There has to be DIY solution.

 

[ASbobcat]

For me with 115's in my Dasher barrels I ran +2950-fps from RL15, and +3000 from RL17, in +28" barrels.
The new IMR-4451 powder should also give strong velocities for the 115's in a Dasher.
And I believe David Tubbs is working on another 115 class bullet that may be out soon as well.
Good Luck
Donovan

+1 on RL-17

 

[johara1]

Just wait till RL- 16 comes out……. jim

 

[rifle48]

Yes. I shoot more 115's in the Dasher than any other weight. An 8 twist will work with the DTAC but I prefer the 7.5 twist and have made hits on an 18 in plate at one mile.
One day when conditions were perfect I was shooting at 1580 at my prarie dog and ground hog.
I had 20 shells and made 2 hits on Chuckie and 2 hits on Chico. 4 / 20 at 1580 yards.
And you can get 2900 fps plus with the Dasher with RL-15.

Birddog jump or jam & how many grains RL15

 

[jsimonh]

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

 

[birdog]

Birddog jump or jam & how many grains RL15

Slight Jump
33.3 gr RL-15

 

[swd]

Slight Jump
33.3 gr RL-15

How much free bore does your chamber have?

 

[birdog]

How much free bore does your chamber have?

My smith has a throater. Non of the bearing surface is below the shoulder\neck junction.
Only the boat tail is below the shoulder/neck junction.

 

[swd]

My smith has a throater. Non of the bearing surface is below the shoulder\neck junction.
Only the boat tail is below the shoulder/neck junction.

Lots

 

[upSLIDEdown]

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.

 

[dmoran]

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.

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

 

[ShootDots]

To get the most velocity potential from the 115-DTAC 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

Now this ^^^^^^ is a well thought out plan to gain the most possible advantage using a Dasher with a 115 gr projectile! Great job Donovan!

 

[upSLIDEdown]

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

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...

 

[dmoran]

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...

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