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DMORAN--more on Rebated DTAC

birdog

DASHER DOME
Gold $$ Contributor
Donovan,
I mounted my NF 8-32 in Barrett rings Thursday and went to the range with some New RB DTAC's and 105 Berger Hybrids. I bore sighted the NF and my first shot was about an inch from my 1/2 inch bullseye. My zeroing was done with some old style DTAC's I had left over. Next two shots cut each other so I was ready for the new RB'ed DTACS's.
I did not touch the elevation or windage knobs during the entire test. All three of these bullets shot to the same POI.
Next, I took the new RB DTAC and shot three shots, All three cut each other at 8 O'clock on orange bull.

Next I shot three 105 Hybrids and same deal. First two went through same hole, third shot elongated the hole slightly.

Next I had a new, first time to the DOME shooter, Greg Salazar. He had never fired a bench gun. I gave him the Jewell trigger class and let him shoot a group. His first shot was slightly low, probably nervous and expecting the 17 pound Dasher to kick. He settled down and his next 3 shots cut each other art 8 O'clock on the orange bull. He is ruined. I warned him not to come. Hold on to your wallet Greg!



Next, I wanted to compare the RB'ed DTAC to the 105 Hybrid. I shot a 3 shot group with each bullet at 800 yards. I shot round-robin (alternating) so as not to favor either bullet with barrel heat or wind.
The DTAC shot about a half inch less spread. The DTAC also had two of the three shots touching.
To the Hybrid 105's credit, it's group was at least a foot higher on the target.
Small orange dots are one inch. I used the large two inch dot as aim point.

Low left is the 3 shot DTAC group.
High right is the 3 shot Hybrid group




Sorry. It was 28 degrees and I did not get my chrono out.
My fingers were numb.
 
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So it looks like the new 115 DTAC was plenty stable in the 8 twist. I know when I shot the old DTAC in my 243 7.5 twist Brux they were amazingly accurate. I had then shooting inside and inch for three-shot at 500 yards.
***edited out my pre-holiday stupidity*** Thanks dmoran!
 
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Birddog -

Another much appreciated report..... Thank you
It will be great to know the velocity separation between them when ever you do chronograph (when its warmer...lol). Then we can compute the BC and have a look at ballistic separation.

Happy Shooting
Donovan
 
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So it looks like the 110 DTAC was plenty stable in the 8 twist. I know when I shot the old DTAC in my 243 7.5 twist Brux they were amazingly accurate. I had then shooting inside and inch for three-shot at 500 yards.

Think you may be confusing the new 110-SMK with the new 115-RB-DTAC.
Birddog was shooting the new 115-RB-DTAC and 105 Hybrids.
Story isn't out yet on the stability of the 110-SMK in 8-twists barrels.
Our forecast here is for warmer weather next week (sub-zero here now). Crossing my fingers in hope to get out and give the 110-SMK some range time.
Donovan
 
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Think you may be confusing the new 110-SMK with the new 115-RB-DTAC.
Birddog was shooting the new 115-RB-DTAC and 105 Hybrids.
Story isn't out yet on the stability of the 110-SMK in 8-twists barrels.
Our forecast here is for warmer weather next week (sub-zero here now). Crossing my fingers in hope to get out and give the 110-SMK some range time.
Donovan
:oops: Thanks for helping an old guy out. I edited my post.
 
Great to hear the 1:8" twist will stabilize them. I will be on the phone with Bartlein Monday to order a 1:8" barrel for my Dasher.
This is my go-to site for accuracy questions/knowledge.

thank all of you,

Rich
 
I order my new barrels these days in 7.5 twist. I just think the 7.5 does a better job with the 115's, 110's, and 105 Hybrid
I have a had a few 7 twist in the past but have settled on 7.5. The last new barrel I got was for a XC and it is a 7.5
 
I order my new barrels these days in 7.5 twist. I just think the 7.5 does a better job with the 115's, 110's, and 105 Hybrid
I have a had a few 7 twist in the past but have settled on 7.5. The last new barrel I got was for a XC and it is a 7.5
All mine are 7.5s too. I tried to order a Schneider in a 7 as a fudge factor and he told me the 7.5 IS a fudge factor. Funny.
 
Donovan, I checked my records on this barrel and I did get a chrono reading on the Hybrids a few days ago.
2992 fps with 33.5 Norma 203-B.

I will try to load a few of the 115 RB's and get a reading.
 
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