The 6UM

[Braaap]

710 yard shot. Hit the bull about as perfect as you possibly can in the pocket. He took one step backwards then one step forward, then he was down and dead. I watched the whole process in the scope. I tried to shoot the hell out of him like Form but he didnt give me the chance

I still suck at taking after action pics especially when you have a nine mile pack out. It pinholes in and the exit pic doesn’t do it justice but it had massive damage on exit.

The bull was long in the tooth!

Thank goodness for Justin Stark and his packgoats!

My shooting position

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@Ryan Avery did Form talk you into the Tracker ESC’s too?

 

[Ryan Avery]

@Ryan Avery did Form talk you into the Tracker ESC’s too?

Not really, been wearing Altras for years. My Chiropractor was the first person to introduce them to me.


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[PathFinder]

My buddy's whitetail. Shots were at 525 and 550. Impacts around 2700. First shot was too far back, I missed the wind call. Wind was around 20 mph. It broke the femur and ended up almost exiting (in several pieces) at the rear of the rib cage. Second shot was quartered hard away. Entered at the rear of the rib cage, ended up underneath the offside shoulder with no exit. This shot dropped the buck. Pictures show the entry wounds, which are much larger than caliber size. Take into account is that the birds were picking at the wounds before we got over there. Overall entry sizes were the same but the birds were pulling stuff out.
My overall takeaway is that the deep cut 115 DTACs are quite frangible. Haven't personally shot the standard cuts but these seem to initiate expansion more quickly and violently. I'd recommend these over standard cuts if you want faster upset or for smaller game.

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[Dobermann]

From the elk posted above. 115gr DTAC

Approximately 1,940fps impact velocity. No bones hit until exit side rib. First shot was very rear lobe of lung. No upset at this point.

View attachment 630521


Then it caught the very front of the stomach. Look to the left of the knife tip and you can see the hole into the stomach.
View attachment 630522


Came out through the edge of the liver, and the other lungs rear lobe and is showing signs of yawing (tumbling), breaking a rib on exit.
View attachment 630523


Exit side shows a near perfect sideways bullet from yawing.

View attachment 630524



Second hit was through lower neck, no pictures unfortunately. The elk fell at that shot, started tumbling down hill, then at some point stood up generally quartering away, and the third hit angled through the femur and lower spine. The bull dropped at this shot and laid still with his head down for a few seconds, then tried to lift his head again, and a final shot was put into his neck.

Femur/spine impact. This was approximately a 4” diameter wound channel.
View attachment 630525

Thanks Form - instructive as always!

Can't help but ask though - is that your Cold Steel? If so, model? Thoughts?

 

[RMM]

My buddy's whitetail. Shots were at 525 and 550. Impacts around 2700. First shot was too far back, I missed the wind call. Wind was around 20 mph. It broke the femur and ended up almost exiting (in several pieces) at the rear of the rib cage. Second shot was quartered hard away. Entered at the rear of the rib cage, ended up underneath the offside shoulder with no exit. This shot dropped the buck. Pictures show the entry wounds, which are much larger than caliber size. Take into account is that the birds were picking at the wounds before we got over there. Overall entry sizes were the same but the birds were pulling stuff out.
My overall takeaway is that the deep cut 115 DTACs are quite frangible. Haven't personally shot the standard cuts but these seem to initiate expansion more quickly and violently. I'd recommend these over standard cuts if you want faster upset or for smaller game.

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Off topic, but did he die on a shed antler under his front left leg?

 

[Formidilosus]

Thanks Form - instructive as always!

Can't help but ask though - is that your Cold Steel? If so, model? Thoughts?

Yes. It’s a Canadian Belt Knife style. The Cold Steel is fine, I was trying the blade shape- it’s excellent for skinning and quartering.

 

[PathFinder]

Off topic, but did he die on a shed antler under his front left leg?

He did. The match was about 10 yards away.

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[ID_Matt]

@Formidilosus how would a 108 eldm have differed than the 115 NR DTAC at 1940 FPS?

I am all for for these hot rod 6mm's, but sometimes I wonder if a set up like @huntnful 6PRC would be the ticket for 90% of guys. Running the 108 eldm's just a touch slower (100-150 FPS??) to where you don't have to worry about them popping in mid air or blowing a suppressor up. Easy neck down on the brass vs fireforming

 

[HingleMcCringleberry]

@Formidilosus how would a 108 eldm have differed than the 115 NR DTAC at 1940 FPS?

I am all for for these hot rod 6mm's, but sometimes I wonder if a set up like @huntnful 6PRC would be the ticket for 90% of guys. Running the 108 eldm's just a touch slower (100-150 FPS??) to where you don't have to worry about them popping in mid air or blowing a suppressor up. Easy neck down on the brass vs fireforming

I'm not form, and probably don't have 90% of his knowledge, but I think the 6 creedmoor is probably the ticket for a large majority of shooters. You can get 3k fps with the 108eldm. That puts your effective range way out there (7-800 depending).

But that's just what I've gathered from all the info out there. I love the idea of the 6UM, but my capabilities aren't there yet to justify stepping up from the creedmoor.

 

[Brontosaurus]

That puts your effective range way out there (7-800 depending).

at my elevation I hit 1800 fps @ 900yds

6 creed is insanely capable

 

[ID_Matt]

at my elevation I hit 1800 fps @ 900yds

6 creed is insanely capable

With @huntnful 6 PRC it would be close to 1100

 

[Formidilosus]

@Formidilosus how would a 108 eldm have differed than the 115 NR DTAC at 1940 FPS?

The diaphragm and the rear portions of the lungs would have had significantly more damage. It would not have exited most likely, but the damage would most likely have been better for this particular shot.

I am all for for these hot rod 6mm's, but sometimes I wonder if a set up like @huntnful 6PRC would be the ticket for 90% of guys. Running the 108 eldm's just a touch slower (100-150 FPS??) to where you don't have to worry about them popping in mid air or blowing a suppressor up. Easy neck down on the brass vs fireforming

With a 1-7.5” or 1-8” twist, there is no issue with the 6UM blowing a bullet up. Certainly not in the suppressor.

The issue with the 6 PRC is a relativity small increase in MV for a whole lot more powder. Common loads with a 6cm are 3,050fps MV for 108’s and a 20’ish inch barrel. I wouldn’t bother with a PRC for 3,150fps MV.

The next one we will be trying is 6mm-7PRC. That may be the one for ease. About same/same powder capacity as the 6 UM.



Edited to add barrel length.

 

[Brontosaurus]

Form, do you think there's a place for the 115 hunting VLD in the 6 UM or are DTACs still THE bullet?

At mv of 3300 I'm hitting 1800 @ 1200 yds

 

[huntnful]

The diaphragm and the rear portions of the lungs would have had significantly more damage. It would not have exited most likely, but the damage would most likely have been better for this particular shot.




With a 1-7.5” or 1-8” twist, there is no issue with the 6UM blowing a bullet up. Certainly not in the suppressor.

The issue with the 6 PRC is a relativity small increase in MV for a whole lot more powder. Common loads with a 6cm are 3,050fps MV for 108’s and a 20’ish inch barrel. I wouldn’t bother with a PRC for 3,150fps MV.

The next one we will be trying is 6mm-7PRC. That may be the one for ease. About same/same powder capacity as the 6 UM.



Edited to add barrel length.

Yeah it wasn’t as fast as I thought it was going to be honestly.

108 ELDM with 53gr. 4831 SC for 3260fps in a 24” barrel. Sure it would go faster with a VV powder, but I hate that dirty shit lol.

What played mostly into for me was that I already had 6.5 PRC brass and dies and it was an easy 6mm conversion.

 

[Formidilosus]

Form, do you think there's a place for the 115 hunting VLD in the 6 UM or are DTACs still THE bullet?

At mv of 3300 I'm hitting 1800 @ 1200 yds

Ehh. Not really. It has a relatively low BC given weight, and isn’t better terminally than other options.

 

[Ryan Avery]

I hate FFing brass. But we didn’t end up with the 6UM by accident. You would be hard pressed to get more performance out of a SA 6mm case.


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[Brontosaurus]

I hate FFing brass. But we didn’t end up with the 6UM by accident. You would be hard pressed to get more performance out of a SA 6mm case.


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Will the next run of Peterson be just 6.5 saum? Or is it gonna come fully formed and head stamped?

 

[Ryan Avery]

Will the next run of Peterson be just 6.5 saum? Or is it gonna come fully formed and head stamped?

Don’t know yet

 

[Split toe]

I hate FFing brass. But we didn’t end up with the 6UM by accident. You would be hard pressed to get more performance out of a SA 6mm case.


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How does it compare to 6 PRC?

 

[B23]

What y'all using for bottom metal, hinged floor plate or det mag setups?

I ask because I'm building a 25 SAUM on a BAT Igniter short action and the short mags don't always feed the greatest so I'm not sure if a 3.100 Baney box and hinged floor plate will feed fine or if I should go with a UM det mag setup with their short XL mags. Shooting the new 134 ELD-M and they are a longggggg ass bullet so something 3.100 - 3.100+ will be a must but I want it to feed well too.

Since you 6 UM guys are using the same parent case, except slightly blown out, I figured y'all would know what setup feeds best with the short fat magnum cases.