Range Report 115 DTAC BC
- Thread starter rtr
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Re: 115 DTAC BC
Seems like .585 has worked for me if I remember right.
Seems like .585 has worked for me if I remember right.
Re: 115 DTAC BC
.585 has also been what I used. At 2950fps elevation was off .2mil at 1000yards and that was more likely me than anything else.
.585 has also been what I used. At 2950fps elevation was off .2mil at 1000yards and that was more likely me than anything else.
Re: 115 DTAC BC
JBM has the data already for the pointed DTAC in the drop down chart at the top. Once you put that in there it over rides the BC/Bullet weight/caliber below it and no need to put it in. I always used G1 .585 before JBM had them in their drop down and it always worked but that was the older non pointed BNs.
JBM has the data already for the pointed DTAC in the drop down chart at the top. Once you put that in there it over rides the BC/Bullet weight/caliber below it and no need to put it in. I always used G1 .585 before JBM had them in their drop down and it always worked but that was the older non pointed BNs.
Re: 115 DTAC BC
Use .600 for G1 with the newer BN coated and pointed bullets. It's probably closer to .615 in real world conditions, but the lots I have are not as pointed as they might be if using a Whidden die on the older lots. I've probably shot 9-10k of the DTACS in all their iterations and also used .585 G1 for the old ones with very good results.
Best,
James
Use .600 for G1 with the newer BN coated and pointed bullets. It's probably closer to .615 in real world conditions, but the lots I have are not as pointed as they might be if using a Whidden die on the older lots. I've probably shot 9-10k of the DTACS in all their iterations and also used .585 G1 for the old ones with very good results.
Best,
James
Re: 115 DTAC BC
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rtr</div><div class="ubbcode-body">The 115 DTAC is not in the list of projectiles in Ballistic FTE for iPhone.</div></div>
It doesn't have any of the Litz or rimfire bullet values either... bit disappointing.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rtr</div><div class="ubbcode-body">The 115 DTAC is not in the list of projectiles in Ballistic FTE for iPhone.</div></div>
It doesn't have any of the Litz or rimfire bullet values either... bit disappointing.
Re: 115 DTAC BC
I have found a G7 of .295 was a better fit for my drop charts. I've been extremely happy with the increase in performance with the pointed DTACs and would love to see other manufacturers follow suit with this feature addition.
I have found a G7 of .295 was a better fit for my drop charts. I've been extremely happy with the increase in performance with the pointed DTACs and would love to see other manufacturers follow suit with this feature addition.
Re: 115 DTAC BC
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mattmcg</div><div class="ubbcode-body">I have found a G7 of .295 was a better fit for my drop charts. I've been extremely happy with the increase in performance with the pointed DTACs and would love to see other manufacturers follow suit with this feature addition.</div></div>
is that with pointed bullets with boron nitride coating?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mattmcg</div><div class="ubbcode-body">I have found a G7 of .295 was a better fit for my drop charts. I've been extremely happy with the increase in performance with the pointed DTACs and would love to see other manufacturers follow suit with this feature addition.</div></div>
is that with pointed bullets with boron nitride coating?
Re: 115 DTAC BC
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kombayotch</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rtr</div><div class="ubbcode-body">The 115 DTAC is not in the list of projectiles in Ballistic FTE for iPhone.</div></div>
It doesn't have any of the Litz or rimfire bullet values either... bit disappointing. </div></div>
I too was disappointed. DTAC data was there in some of the earlier versions.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kombayotch</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rtr</div><div class="ubbcode-body">The 115 DTAC is not in the list of projectiles in Ballistic FTE for iPhone.</div></div>
It doesn't have any of the Litz or rimfire bullet values either... bit disappointing. </div></div>
I too was disappointed. DTAC data was there in some of the earlier versions.
Re: 115 DTAC BC
0.54 G1 according to Ed. 1 of Mr. Litz' book
Those values are from c.2008/2009 testing though when I talked to him in January. If there has been a change the BC is likely not the same.
A good friend has been shooting them for years and with the last few boxes he has been using 0.575 and getting FRH's on sub MOA targets at 800-1000yd.
0.54 G1 according to Ed. 1 of Mr. Litz' book
Those values are from c.2008/2009 testing though when I talked to him in January. If there has been a change the BC is likely not the same.
A good friend has been shooting them for years and with the last few boxes he has been using 0.575 and getting FRH's on sub MOA targets at 800-1000yd.
Re: 115 DTAC BC
I use .585 g1 in exbal and it is dead on out to 1000
I use .585 g1 in exbal and it is dead on out to 1000
Re: 115 DTAC BC
I've trued the BC using JBM at 1k yards based on velocity near and far and it calculates at .571 for the latest BN coated/more pointed DTAC so that is what I have been using in my solver and it has proven accurate to 1300 yards.
I trued my BC via this method and then trued the velocity based off of actual correction required and arrived at what I utilize in Shooter.
I also used the utility BC calculator based off of drop over distance that is available on the $30 KAC Bullet Flight app and the BC calculated at .570
When I used the Litz BC, I was always truing the velocity to be more than what I thought it really was. Once I trued the BC from velocity, I re-trued my velocity based on drop in comparison to provided data and it was much closer.
I've trued the BC using JBM at 1k yards based on velocity near and far and it calculates at .571 for the latest BN coated/more pointed DTAC so that is what I have been using in my solver and it has proven accurate to 1300 yards.
I trued my BC via this method and then trued the velocity based off of actual correction required and arrived at what I utilize in Shooter.
I also used the utility BC calculator based off of drop over distance that is available on the $30 KAC Bullet Flight app and the BC calculated at .570
When I used the Litz BC, I was always truing the velocity to be more than what I thought it really was. Once I trued the BC from velocity, I re-trued my velocity based on drop in comparison to provided data and it was much closer.
Re: 115 DTAC BC
Litz's second Ed. book says a average BC of .276 G7
Litz's second Ed. book says a average BC of .276 G7
Re: 115 DTAC BC
Shot them at 1500 yds this past weekend using the JBM drop down for the "pointed DTAC". JBM called for 13.6 mils at 1500 yds for my DOPE. My actual turned out to be 13.7 mils with 5 impacts confirmed on a full size IPSC. I don't know what JBM is using as far as G7 and G1 drag models, but it is dead on.
-SBS
Shot them at 1500 yds this past weekend using the JBM drop down for the "pointed DTAC". JBM called for 13.6 mils at 1500 yds for my DOPE. My actual turned out to be 13.7 mils with 5 impacts confirmed on a full size IPSC. I don't know what JBM is using as far as G7 and G1 drag models, but it is dead on.
-SBS
Re: 115 DTAC BC
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SagebrushShooter</div><div class="ubbcode-body">Shot them at 1500 yds this past weekend using the JBM drop down for the "pointed DTAC". JBM called for 13.6 mils at 1500 yds for my DOPE. My actual turned out to be 13.7 mils with 5 impacts confirmed on a full size IPSC. I don't know what JBM is using as far as G7 and G1 drag models, but it is dead on.
-SBS </div></div>
Are you talking about the bullet library in JBM?
Mine doesn't have DTACS as an option to select from.
Hmmmmm
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SagebrushShooter</div><div class="ubbcode-body">Shot them at 1500 yds this past weekend using the JBM drop down for the "pointed DTAC". JBM called for 13.6 mils at 1500 yds for my DOPE. My actual turned out to be 13.7 mils with 5 impacts confirmed on a full size IPSC. I don't know what JBM is using as far as G7 and G1 drag models, but it is dead on.
-SBS </div></div>
Are you talking about the bullet library in JBM?
Mine doesn't have DTACS as an option to select from.
Hmmmmm
Re: 115 DTAC BC
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lofty</div><div class="ubbcode-body">
Are you talking about the bullet library in JBM?
Mine doesn't have DTACS as an option to select from.
Hmmmmm </div></div>
Yes I was talking about the bullet library in JBM. Guess that was not clear in my original post.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lofty</div><div class="ubbcode-body">
Are you talking about the bullet library in JBM?
Mine doesn't have DTACS as an option to select from.
Hmmmmm </div></div>
Yes I was talking about the bullet library in JBM. Guess that was not clear in my original post.
Re: 115 DTAC BC
Throw something like .6 G1 at it, and go record data at as many distances as possible.... Short to long. Get as long as possible... BC doesn't really begin to reveal itself, until you've cut some air.
Make sure you have a good zero, and record the atmospherics. Use this enviornmental data when tweaking out your program of choice.
Tweak velocity & BC to match your curve... I've found I usually need to dumb down velocity to make the short stuff match, and crank up the BC to get the long stuff dialed.
Plugging in a "stock" number has never worked out of the box for me.
No offense meant if this is old hat to you....
Just my experience, FWIW. ....Running FFS.
Throw something like .6 G1 at it, and go record data at as many distances as possible.... Short to long. Get as long as possible... BC doesn't really begin to reveal itself, until you've cut some air.
Make sure you have a good zero, and record the atmospherics. Use this enviornmental data when tweaking out your program of choice.
Tweak velocity & BC to match your curve... I've found I usually need to dumb down velocity to make the short stuff match, and crank up the BC to get the long stuff dialed.
Plugging in a "stock" number has never worked out of the box for me.
No offense meant if this is old hat to you....
Just my experience, FWIW. ....Running FFS.
Re: 115 DTAC BC
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SagebrushShooter</div><div class="ubbcode-body">Shot them at 1500 yds this past weekend using the JBM drop down for the "pointed DTAC". JBM called for 13.6 mils at 1500 yds for my DOPE. My actual turned out to be 13.7 mils with 5 impacts confirmed on a full size IPSC. I don't know what JBM is using as far as G7 and G1 drag models, but it is dead on.
-SBS </div></div>
Sage,
Are you using the BN coated or the bare?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: SagebrushShooter</div><div class="ubbcode-body">Shot them at 1500 yds this past weekend using the JBM drop down for the "pointed DTAC". JBM called for 13.6 mils at 1500 yds for my DOPE. My actual turned out to be 13.7 mils with 5 impacts confirmed on a full size IPSC. I don't know what JBM is using as far as G7 and G1 drag models, but it is dead on.
-SBS </div></div>
Sage,
Are you using the BN coated or the bare?
Re: 115 DTAC BC
Coated bullets. Shot them again at 1475 yds measured on the laser. 3 impacts confirmed on steel.
12.5 mils DOPE, 2.5 mils of left wind.
3,100fps (39.6 grns RE-17) out of a 28" 1-8 twist 4 grove Lilja.
Coated bullets. Shot them again at 1475 yds measured on the laser. 3 impacts confirmed on steel.
12.5 mils DOPE, 2.5 mils of left wind.
3,100fps (39.6 grns RE-17) out of a 28" 1-8 twist 4 grove Lilja.
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