The 22UM

[Ryan Avery]

Oh I haven’t seen this thread. I need one ASAP

Call @Unknown Munitions the reamer has landed.

 

[Formidilosus]

Call @Unknown Munitions the reamer has landed.

The first one better be mine.

 

[Ryan Avery]

The first one better be mine.

No you get the first 17UM


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[lak2004]

This sounds sweet but I'll have to stick with plans for 6um since I live in CO.

 

[Robinhood21]

Sorry if I missed it but is UM going to be offering formed brass?

 

[sportsmans challenge]

The first one better be mine.

You get your 22um in hand yet

 

[Formidilosus]

You get your 22um in hand yet

Not yet. Busy with other things.

 

[Jimbee]

Is the 22um derived from saum brass?

 

[amassi]

Is the 22um derived from saum brass?

Yes


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[eLightfoot]

Can someone smarter than me explain how the UM cartridges make sense in a short barrel? Seem like the whole idea behind the 6 and 22um is to get max velocity out a short, suppressed barrel. Needing powders like N570 my mind immediately goes to thinking a good amount of the powder is not burning behind the bullet. Rather burning or not burning in the can. Also lots of potential for extreme carbon fouling/pressure spikes/shucking jackets/high maintenance? Is it possible to accumulate enough unburnt powder in a suppressor for it to become a pipe bomb? Help me understand this madness lol. I’ve had 77tmks blowup out of a 7.5t creedmoor that was semi dirty.

 

[Ryan Avery]

Can someone smarter than me explain how the UM cartridges make sense in a short barrel? Seem like the whole idea behind the 6 and 22um is to get max velocity out a short, suppressed barrel. Needing powders like N570 my mind immediately goes to thinking a good amount of the powder is not burning behind the bullet. Rather burning or not burning in the can. Also lots of potential for extreme carbon fouling/pressure spikes/shucking jackets/high maintenance? Is it possible to accumulate enough unburnt powder in a suppressor for it to become a pipe bomb? Help me understand this madness lol. I’ve had 77tmks blowup out of a 7.5t creedmoor that was semi dirty.

6UM
With a 20” barrel, 700 rounds no cleaning didn’t see any excess build up of carbon in the can.

16.5” barrel, I was increasing velocity way past max. That tells me it’s burning the powder.

No intel on the 22UM


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[eLightfoot]

6UM
With a 20” barrel, 700 rounds no cleaning didn’t see any excess build up of carbon in the can.

16.5” barrel, I was increasing velocity way past max. That tells me it’s burning the powder.

No intel on the 22UM


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How about carbon ring in the throat?

 

[Ryan Avery]

How about carbon ring in the throat?

Zero

It’s funny I have shot out 7 300 RUM barrels and never had issue with not cleaning them.

 

[ACHILLES]

Are yal planning to just switching bushings in a 6UM die for now? I have a spare tikka magnum action in the safe. Also bought a $260 witt machine 22cal can on sale with this or a 22/270imp in mind. That way I could run a 16” and not lose to much if the can gets destroyed from a bullet coming apart. This one has no bbl length restrictions.

 

[Ryan Avery]

Thank you Hornady!


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[sportsmans challenge]

Thank you Hornady!


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You have something to launch those out of yet?

 

[Ryan Avery]

You have something to launch those out of yet?

Form will soon


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[Lawnboi]

I’m real curious if they designed the 80 eldx with higher RPM in mind.

 

[Formidilosus]

I’m real curious if they designed the 80 eldx with higher RPM in mind.

No. Same basic parameters- 300k and less and you won’t have any/many issues. Get above that and it starts becoming more likely as you go up. At 3,500fps with an 8” twist, it’ll be 315,000 RPM. I’m comfortable with that.

 

[Lawnboi]

No. Same basic parameters- 300k and less and you won’t have any/many issues. Get above that and it starts becoming more likely as you go up. At 3,500fps with an 8” twist, it’ll be 315,000 RPM. I’m comfortable with that.

Do you have any other info on this bullet how closely it’s related to the 88 and 80 eldm, along with the 77tmk?

Curious why you would go down this road when the 88 eldm is available.