The 6UM

[Dhughes]

What is your load for the 95. I am getting a 18” 6-saum done for the 90 grain game changer and would like a idea of what powders are going to be best
Thanks

I’m running reloader 26.

 

[danielhp89]

Maybe I missed it, but has anyone ran the Hornady 80gr ELD-VT in the 6UM?

 

[rousseb]

Maybe I missed it, but has anyone ran the Hornady 80gr ELD-VT in the 6UM?

That makes 2 of us!

 

[Formidilosus]

Maybe I missed it, but has anyone ran the Hornady 80gr ELD-VT in the 6UM?

Probably not. What is the point? It would be functionally equivalent to the 62gr ELD-VT from a 22CM.

 

[danielhp89]

Probably not. What is the point? It would be functionally equivalent to the 62gr ELD-VT from a 22CM.

More knock down thermal hunting is my thought, I did find Dhughes post of 3750 with them out of a 20" which puts them right there with my 22CM with 53gr vmax's.

 

[Antares]

 

[khuber84]

Knockdown there's the fn dumb word again. You want knockdown? Get a 500 Jeffery, it has knock down on both ends!

 

[nm.otter]

If you do, a capacity-to-bore ratio its a little better than a 28 Nosler. SO if I am really nice to it, I think I can get 800 rounds or better.

View attachment 537365

My version uses cubic inches of case capacity divided by the bore diameter (in inches) squared, which becomes a dimensionless number.

The ratio could also be derived from ml and mm.

 

[rousseb]

Probably not. What is the point? It would be functionally equivalent to the 62gr ELD-VT from a 22CM.

I’m pushing the 62gr. ELD-VT @3500 in my 20” 22 Creed. Of course built by the men over at Procision Arms.

 

[Formidilosus]

I’m pushing the 62gr. ELD-VT @3500 in my 20” 22 Creed. Of course built by the men over at Procision Arms.

That’s a very high performance combo.

 

[The Fish Box]

@Ryan Avery any update on brass shipping? Unknown has 3/3 as a possible date from adg.

 

[Armageddon91]

I've read through the whole thread and this is some excellent and exciting stuff, great work on everything and thanks for all the great info. I do have a question, I've read through the whole thread and I'm curious why there isn't more mention of the 110 Atip or 109 LRHT.

I can see the terminal performance of the DTAC NR is unquestioned, but when I run the ballistic calculations for my 6 PRC 26" 7.5twist 5R for the 110/109 vs the 115 it looks to me like I can get the same wind drift performance but even more speed and therefore less drop out of the 109/110s. This is using the G7 BC from the Applied Ballistics app of .302 and it's even pretty comparable still using the g7 that Superior Shooting Solutions gave me of .315 g7 (which seems a little optimistic to me). What are you all getting for a trued g7 BC from the DTAC NR?

I realize I'm not running the exact same chambering, but considering most seem to be running the 6UM in a 20" or 22" and I'm running a 26" PRC they seem pretty close. Is it because the tough jacket of the DTAC is less prone to failure in flight and still upsets down to a super low impact velocity?

The reason I ask is since we are in the offseason, I'd like to get a solid load developed for big game hunting in CO this year and if I'm to pick a bullet to load dev for then now is the time. Up until now I've been using the 110 atip at about 3375 fps, but reports on it's terminal effects on game seem to be hit or miss, and I'm worried that as my barrel gets more firecracking (at about 600 rounds now on it) that it's more susceptible to a jacket failure than a 109 or the 115. I am running a 7.5twist 5R so it seems less likely it'll blow a jacket, but better safe than sorry I say. Thanks all!

 

[Brontosaurus]

I've read through the whole thread and this is some excellent and exciting stuff, great work on everything and thanks for all the great info. I do have a question, I've read through the whole thread and I'm curious why there isn't more mention of the 110 Atip or 109 LRHT.

I can see the terminal performance of the DTAC NR is unquestioned, but when I run the ballistic calculations for my 6 PRC 26" 7.5twist 5R for the 110/109 vs the 115 it looks to me like I can get the same wind drift performance but even more speed and therefore less drop out of the 109/110s. This is using the G7 BC from the Applied Ballistics app of .302 and it's even pretty comparable still using the g7 that Superior Shooting Solutions gave me of .315 g7 (which seems a little optimistic to me). What are you all getting for a trued g7 BC from the DTAC NR?

I realize I'm not running the exact same chambering, but considering most seem to be running the 6UM in a 20" or 22" and I'm running a 26" PRC they seem pretty close. Is it because the tough jacket of the DTAC is less prone to failure in flight and still upsets down to a super low impact velocity?

The reason I ask is since we are in the offseason, I'd like to get a solid load developed for big game hunting in CO this year and if I'm to pick a bullet to load dev for then now is the time. Up until now I've been using the 110 atip at about 3375 fps, but reports on it's terminal effects on game seem to be hit or miss, and I'm worried that as my barrel gets more firecracking (at about 600 rounds now on it) that it's more susceptible to a jacket failure than a 109 or the 115. I am running a 7.5twist 5R so it seems less likely it'll blow a jacket, but better safe than sorry I say. Thanks all!

I believe that the terminal performance consistency of the NR Dtac outweighs the slight benefit of the 109/110. The 6 UM is a system designed around that particular bullet to deliver an incredibly high hit rate while also providing terminal consistency.

 

[Elkster23]

I've read through the whole thread and this is some excellent and exciting stuff, great work on everything and thanks for all the great info. I do have a question, I've read through the whole thread and I'm curious why there isn't more mention of the 110 Atip or 109 LRHT.

I can see the terminal performance of the DTAC NR is unquestioned, but when I run the ballistic calculations for my 6 PRC 26" 7.5twist 5R for the 110/109 vs the 115 it looks to me like I can get the same wind drift performance but even more speed and therefore less drop out of the 109/110s. This is using the G7 BC from the Applied Ballistics app of .302 and it's even pretty comparable still using the g7 that Superior Shooting Solutions gave me of .315 g7 (which seems a little optimistic to me). What are you all getting for a trued g7 BC from the DTAC NR?

I realize I'm not running the exact same chambering, but considering most seem to be running the 6UM in a 20" or 22" and I'm running a 26" PRC they seem pretty close. Is it because the tough jacket of the DTAC is less prone to failure in flight and still upsets down to a super low impact velocity?

The reason I ask is since we are in the offseason, I'd like to get a solid load developed for big game hunting in CO this year and if I'm to pick a bullet to load dev for then now is the time. Up until now I've been using the 110 atip at about 3375 fps, but reports on it's terminal effects on game seem to be hit or miss, and I'm worried that as my barrel gets more firecracking (at about 600 rounds now on it) that it's more susceptible to a jacket failure than a 109 or the 115. I am running a 7.5twist 5R so it seems less likely it'll blow a jacket, but better safe than sorry I say. Thanks all!

Just the rifle I have. 18in 1-7.5 ace suppressed with formed 6.5 saum brass.

115 Dtac HBN coated
N570
68 gr
F215m
3150 Fps

109 berger LRHT HBN COATED
N570
69gr
F215M
3100 FPS

Not sure why. But I have to run the 109s with more powder to get the same speed as the 115s . It's even slower non coated.
The 109 non coated ran pressure at the same load the 115s do coated. So I ordered an HBN kit and coated them but the speed with the same charge isn't there.

 

[Armageddon91]

Just the rifle I have. 18in 1-7.5 ace suppressed with formed 6.5 saum brass.

115 Dtac HBN coated
N570
68 gr
F215m
3150 Fps

109 berger LRHT HBN COATED
N570
69gr
F215M
3100 FPS

Not sure why. But I have to run the 109s with more powder to get the same speed as the 115s . It's even slower non coated.
The 109 non coated ran pressure at the same load the 115s do coated. So I ordered an HBN kit and coated them but the speed with the same charge isn't there.

Interesting, that's a good data point. What did the BC of those DTACs true out to for you? And I'm assuming those are with the nose rings?

 

[Stocky]

Just the rifle I have. 18in 1-7.5 ace suppressed with formed 6.5 saum brass.

115 Dtac HBN coated
N570
68 gr
F215m
3150 Fps

109 berger LRHT HBN COATED
N570
69gr
F215M
3100 FPS

Not sure why. But I have to run the 109s with more powder to get the same speed as the 115s . It's even slower non coated.
The 109 non coated ran pressure at the same load the 115s do coated. So I ordered an HBN kit and coated them but the speed with the same charge isn't there.

Lighter bullet, less bearing surface(im assuming), means less pressure. Pressure and time exerted are the work that creates speed.

That would explain some of it but does seem a pretty decent difference if 50fps slower and a grain more powder.

It's why slow powders are usually faster as they exert pressure for longer so increase the total energy imparted. Same as why heavy bullets loose less velocity with a shorter barrel than light ones do.

If you look at a pressure time chart it's the area under the chart that determines velocity.

 

[Elkster23]

Interesting, that's a good data point. What did the BC of those DTACs true out to for you? And I'm assuming those are with the nose rings?

I run the dope that 4dof has the 115 dtac at. I haven't had the 6um done very long. The way it is right now I range dial and if I do my part it's an impact. I have ran their dope to 1310 with great results. I'm still testing but as of right now I'll stick with the dtac's. They are the deep cut though.

 

[Eiden]

I've read through the whole thread and this is some excellent and exciting stuff, great work on everything and thanks for all the great info. I do have a question, I've read through the whole thread and I'm curious why there isn't more mention of the 110 Atip or 109 LRHT.

I can see the terminal performance of the DTAC NR is unquestioned, but when I run the ballistic calculations for my 6 PRC 26" 7.5twist 5R for the 110/109 vs the 115 it looks to me like I can get the same wind drift performance but even more speed and therefore less drop out of the 109/110s. This is using the G7 BC from the Applied Ballistics app of .302 and it's even pretty comparable still using the g7 that Superior Shooting Solutions gave me of .315 g7 (which seems a little optimistic to me). What are you all getting for a trued g7 BC from the DTAC NR?

I realize I'm not running the exact same chambering, but considering most seem to be running the 6UM in a 20" or 22" and I'm running a 26" PRC they seem pretty close. Is it because the tough jacket of the DTAC is less prone to failure in flight and still upsets down to a super low impact velocity?

The reason I ask is since we are in the offseason, I'd like to get a solid load developed for big game hunting in CO this year and if I'm to pick a bullet to load dev for then now is the time. Up until now I've been using the 110 atip at about 3375 fps, but reports on it's terminal effects on game seem to be hit or miss, and I'm worried that as my barrel gets more firecracking (at about 600 rounds now on it) that it's more susceptible to a jacket failure than a 109 or the 115. I am running a 7.5twist 5R so it seems less likely it'll blow a jacket, but better safe than sorry I say. Thanks all!

I ran the 109LRHT last year in Wyoming. The setup killed 3 elk and 1 mule deer. The bullet performed very well with the limited amount I have used it. I’m debating on continuing to use it or switch like yourself.


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[eoperator]

1 mile deer.

That's a long shot congrats!

 

[Armageddon91]

I ran the 109LRHT last year in Wyoming. The setup killed 3 elk and 1 mile deer. The bullet performed very well with the limited amount I have used it. I’m debating on continuing to use it or switch like yourself.


Sent from my iPhone using Tapatalk

Good to know! What speeds are you able to get that going in what barrel length?