115 DTAC speeds from 6BRDX

[Eric Leonard]

I like the big .588 BC but not sure if it would go fast enough from the BRDX to actually be better than the faster 105-107 class bullets,,

anybody tested or use the DTAC in the BRDX or Dasher and know how much speed that is safely attainable from a 28 inch 6 BRDX

 

[DukeDuke]

somewhere along the 2900-3000fps line

 

[Bob3700]

For a smaller BR based case, the 115 gr bullets cannot be run fast enough to gain an advantage over the 105-107 gr class of bullets.

It just takes a larger case to run the 115s fast enough to realize their advantage.

You might be able to get the 115s up to 2900-3000 fps in an improved BR case, but I would ask what the case life is at those pressures. Short would be the answer.

If you really want to run that bullet to its potential, you need a case like the 243 SLR or a 6mm CM. There is where you will have all the planets line up for you. High speed, excellent accuracy, and long case life.

Just my .02.

Bob

 

[cmillard]

If you can get those kind of speeds, why not give it a try. even if you could only get 2800 fps or so, it would be worth it.

 

[kyreloader]

I like the big .588 BC but not sure if it would go fast enough from the BRDX to actually be better than the faster 105-107 class bullets,,

anybody tested or use the DTAC in the BRDX or Dasher and know how much speed that is safely attainable from a 28 inch 6 BRDX

If I remember correctly from Bryan Litz's book, the BC of the 115g DTACs and the 105g Berger Hybrids are almost identical. Hence, the added velocity of the 105g Hybrids make it a better choice if shooting a bullet for BC only.

 

[Eric Leonard]

lookin at JBM,,the DTAC at 2800 and 105 VLD at 3000 run very close in the wind and on drops so I guess it will come down to accuracy,

gettin ready to try them out

 

[dmoran]

There were several of us who used 115-DTAC's in 600/1000-BR from 6Dasher's. Primary reason why we haven't in a while is simply availability.

From 6Dasher's, I find to be critical with them is the need of long throats, and suggest +.150" free-bores to be an almost "must have" to obtain upper velocity levels with out pressure issue.

From my 6Dasher barrels with +.150-FB, 2930 to 2970-fps is where I typically had best accuracy. When I would push them at 3000 to 3025 I would see another node, but was harder on brass. RL17 and H4350 did give more speed at less pressure, but RL15 at +/-2950-fps is where I ran them most days.

While the 243 SLR and 6CM that Bob suggest may sling them well enough for High Power realms, in 600/1000 Benchrest those calibers have not proven out well at all (yet any how) and the 6mmBR family rule over them aggressively.

My 2-Cents
Donovan Moran

 

[Bob3700]

Dmoran is correct in that I am not a benchrest shooter so my perspective is from a 600 and 1K sling shooter.

I know that the Dashers and BRXs are THE calibers to shoot in benchrest. They own the majority of the records that have been set at those ranges. I have a BRX and it is the ONLY gun that I would shoot at a 600 yd HP match. Superb accuracy, no recoil and a joy to shoot a lot of Xs with all day long.

That said. The BR cases in HP sling and Fclass don't set records once the wind starts to blow. What cartridges win match in and match out, weather not being considered? A BR class of cartridge will require a shooter that knows how to read the wind. You can shoot 7s and 8s real easy at 1K once the wind begins to pick-up, that is especially true with a BR based cartridge.

If you are shooting the 115 DTAC it is because you are looking for an advantage in the wind, not on a calm day. The 243 SLR and 6mm CM are not the record holders when the wind is on vacation, but when it is blowing and gusting, they will be the calibers that will allow the 115 gr bullets to shine.

A golfer has many clubs in his/her bag for different situations, I don't know that shooting is any different.

Just my thoughts.

Bob

 

[dmoran]

Bob -

I hear what your saying and respect it....... and here is more for ya !.!.!

I haven't shot F-Class since 2009 due to a physical reason of not being able to lay prone in comfort. It sucks because I really enjoyed 1000yd F-Class.
With that said, when I was shooting F-Class with a 6Dasher (after 2005) many of the matches I was using 115-DTAC's with long throated barrels (a .176-FB and a .204-FB). My primary reason was for the ballistic advantage for the wind.
From those long throated Dasher's, I could push the 115 & 117-DTAC's (and 115-VLD's) over +3000 with ease and obtained respectable accuracy that I felt was acceptable for the 5"-Xing and 10"-10-ring F-Class target, and had some of the ballistic advantage similar to what you described in your reply.

If someone wants the upper velocity levels from a 6Dasher for 115-DTAC bullets, consider a "long" throat (hint = .200-FB or more) with plans of RL17, H4350, N550 and the like for powders. You maybe amazed at what they'll do and are capable of....

Agree with you Bob, a golfer has many clubs in there bag..... I have a few barrels sitting in my Dasher barrel rack, from which 1 or 2 are dedicated for "long" bullets at upper velocities. But they are getting dusty....

Donovan

 

[tclaunch]

lookin at JBM,,the DTAC at 2800 and 105 VLD at 3000 run very close in the wind and on drops so I guess it will come down to accuracy,

gettin ready to try them out

The Sierras seat differently than the VLD`s and to add another option the Berger 108 is another that will shoot off the lands and has a better BC than the 105 VLD, but almost always runs slower, that being said they can shoot stellar in the 6 bore.

 

[Jason Boersma]

If you can find them and make them work that's great but remember the most important thing is accuracy, shoot what is the most accurate out of your gun even if it doesn't have the highest bc. I know everyone knows that but I think a lot of people forget it.

 

[Rtheurer]

I have not looked in a while but when is the last time anyone has seen a run of 115 DTAC's? Kind of hard to shoot a bullet that is not around.. Unless you happen to have a stash of them.

 

[DukeDuke]

http://www.davidtubb.com/tubb-accuracy-reloading/dtac115-bare

 

[Bob3700]

Russ,

It seems that Tubb doesn't always have them in stock. Guess Sierra only runs them once a year so I just have to stock up when they have em.

Usually buy 2000 or so and that holds me for a couple of years.

Bob

 

[Rtheurer]

Bob

Sure looks like that is the case. Been quite awhile since I have seen any in stock. I don't use anything Tubb has for sale so Its not a big deal for me.
I had the same issue with JLK bullets when I shot those.. Had to switch one year going into the National Championships because there was none to be had. Oh the pit falls we have at times..

Thanks guys for the updated info.

Russ T

 

[Liven The Dream]

Right Now you can buy them ! Note the New ones are pointed even better BC

I run them out od my 6 Rem. case 1000 yard rifle with a 32" barrel.
AV Vol. 3040 you need 2940 to get them to work at 1000.
Most people running a 6XC never see the advantage of this bullet .

I will add barrel life is not outstanding , but it does shoot.

Just 2 more cents