The 6UM

[Ryan Avery]

What BC do you find true for the deeper cut version?

I haven't shot any yet, but I will run them at .6 to start. I am going to shoot them over the AB Doppler at the NF ELR Challenge.

 

[eLightfoot]

@Ryan Avery
Now you gotta get UM to make the 25UM (257x7prc).

 

[OneSkinnyHunter]

@Ryan Avery
Now you gotta get UM to make the 25UM (257x7prc).

Agreed!

 

[Ryan Avery]

@Ryan Avery
Now you gotta get UM to make the 25UM (257x7prc).

I am all in on the 6UM.. Not enough meat on the bone with the 25s for me plus it would have more recoil than a 6.5 PRC

But @Nbowlin loves the 25 calibers and works with UM everyday. So maybe theres a chance

 

[Nbowlin]

He might of used one in a moment of weakness.

 

[Ryan Avery]

14. Introducing the 6UM Cartridge - Shoot2Hunt

Introducing the 6UM bullet cartridge – the latest innovation in ammunition technology. Engineered by our expert team, the 6UM boasts unparalleled accuracy, impressive velocity, and consistent performance. With a reloadable brass case and cutting-edge design, this cartridge is the perfect choice...

shoot2hunt.com

 

[IrkedCitizen]

@Ryan Avery shouldn't have feeding issues from a 3.850" 300prc magazine? My HNT26 is a 700 long action 3.850".

 

[Ryan Avery]

@Ryan Avery shouldn't have feeding issues from a 3.850" 300prc magazine? My HNT26 is a 700 long action 3.850".

Shouldn’t be and issue. They feed in a 3.95 inch just fine.

 

[Yomomma]

---

Ryan, I’m curious if you guys considered using the 7mm prc case when you started on this project and if there were reasons for not using it other than initial brass availability? I don’t have the exact numbers but I would guess the 7prc case capacity is similar to the 6mm um without having to AI it. Thanks, love the info coming out on this.

 

[Nbowlin]

Ackley does a better job of hiding pressure. Who wants their face rubbed in “it” early when you know you’re going to go “too far” from the start? The improved case is an easy-ish way to kick the “too far” can down the road another hundred or two fps. Or at least that’s why I would do it.

 

[IrkedCitizen]

Shouldn’t be and issue. They feed in a 3.95 inch just fine.

Now the decision of which action to use (TL3/787R) or buy a new one. Lol

 

[slowelk]

Ryan, I’m curious if you guys considered using the 7mm prc case when you started on this project and if there were reasons for not using it other than initial brass availability? I don’t have the exact numbers but I would guess the 7prc case capacity is similar to the 6mm um without having to AI it. Thanks, love the info coming out on this.

7mm PRC case is long action. If anything the question is why not use the 6.5 prc case. I think Ryan associates the PRC too closely to the creedmoor, thus the saum choice due to it's cooler, more niche area of the cartridge world.

 

[Ryan Avery]

---

Ryan, I’m curious if you guys considered using the 7mm prc case when you started on this project and if there were reasons for not using it other than initial brass availability? I don’t have the exact numbers but I would guess the 7prc case capacity is similar to the 6mm um without having to AI it. Thanks, love the info coming out on this.

We did not but I think TS Customs is making a 6mm on the 7 PRC case. Which is awesome cause FF does suck @Nbowlin

If you run the H2O numbers the 7 PRC holds 7 more grains than 6UM. Which is putting it above a 6.5 PRC in recoil in a 6mm configuration. Thats going to change hit efficiency… enough to matter who know have to run the numbers when we see some solid data from the 6mm-7PRC.

Where the 6UM is going to shine is with barrel lengths from 16-20” with suppressors. I would love to see the speed difference between a 6UM and a 6mm-7 PRC in a 18” barrel.

There’s a few 6UMs being built at UMs for customers right now so there should be lots more data coming soon.

Sent from my iPhone using Tapatalk Pro

 

[Ryan Avery]

Now the decision of which action to use (TL3/787R) or buy a new one. Lol

You deserve a new one!

 

[Yomomma]

We did not but I think TS Customs is making a 6mm on the 7 PRC case. Which is awesome cause FF does suck @Nbowlin

If you run the H2O numbers the 7 PRC holds 7 more grains than 6UM. Which is putting it above a 6.5 PRC in recoil in a 6mm configuration. Thats going to change hit efficiency… enough to matter who know have to run the numbers when we see some solid data from the 6mm-7PRC.

Where the 6UM is going to shine is with barrel lengths from 16-20” with suppressors. I would love to see the speed difference between a 6UM and a 6mm-7 PRC in a 18” barrel.

There’s a few 6UMs being built at UMs for customers right now so there should be lots more data coming soon.

Sent from my iPhone using Tapatalk Pro

That makes good sense to me. 7 grains is substantial. Definitely going to degrade the barrel faster and pump up the recoil.

I’ve heard that having a 40 degree shoulder versus the 30 degree on the prc helps protect the throat as well. Supposedly keeps less unburnt powder from slamming into the throat area. I don’t know if this is true or not however.

Will be interesting to see what TS customs comes up with. I’d love to see that 18” barrel comparison.

When you validated trajectory with your 20” barrel how many minutes of drop did you come up with at 1200 yards? I ran a quick chart with an g1 bc of .620 and velocity of 3350 in a 1-7 twist sighted in exactly 1” high at 100 yards and came up with an estimated 22 moa of drop at 1200 yards with a remaining velocity of 1900fps. Curious what you found in real life?

 

[IrkedCitizen]

Can you post a digital reamer print? I know there is a picture of a printout in the thread

 

[IrkedCitizen]

I'm building one. Smith ordered a reamer. Going to rebarrel my 20" 300prc. My 6UM is going to be 18" 1.200" straight contour which will get deep fluted.

 

[Ryan Avery]

I'm building one. Smith ordered a reamer. Going to rebarrel my 20" 300prc. My 6UM is going to be 18" 1.200" straight contour which will get deep fluted.

Sweet!


Sent from my iPhone using Tapatalk Pro

 

[woods89]

14. Introducing the 6UM Cartridge - Shoot2Hunt

Introducing the 6UM bullet cartridge – the latest innovation in ammunition technology. Engineered by our expert team, the 6UM boasts unparalleled accuracy, impressive velocity, and consistent performance. With a reloadable brass case and cutting-edge design, this cartridge is the perfect choice...

shoot2hunt.com

When do we get the terminal ballistics podcast?

 

[Ryan Avery]

When do we get the terminal ballistics podcast?

It’s very terminal