The 22UM

[Robinhood21]

Bumping this because I’m intrigued. I was thinking about building a 6mmPRC but I’m a big fan of .22 cal so a 22PRC sounds amazing.

500-700 round barrel life doesn’t scare me. Quick load development, get dope and then then majority of your rounds go towards animals after that…. Barrel would last for years.

Hmmmm



Any updates on load development, or animals take yet with the 22UM?


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[Xbow hunter]

Bumping this because I’m intrigued. I was thinking about building a 6mmPRC but I’m a big fan of .22 cal so a 22PRC sounds amazing.

500-700 round barrel life doesn’t scare me. Quick load development, get dope and then then majority of your rounds go towards animals after that…. Barrel would last for years.

Hmmmm



Any updates on load development, or animals take yet with the 22UM?


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We are all still patiently waiting.

 

[Formidilosus]

Still waiting on the reamer.

 

[khuber84]

Bumping this because I’m intrigued. I was thinking about building a 6mmPRC but I’m a big fan of .22 cal so a 22PRC sounds amazing.

500-700 round barrel life doesn’t scare me. Quick load development, get dope and then then majority of your rounds go towards animals after that…. Barrel would last for years.

Hmmmm



Any updates on load development, or animals take yet with the 22UM?


Sent from my iPhone using Tapatalk

22prc is likely only going to outpace a 22 creed by 150fps in a shorter barrel. Why go through all the trouble for that? My 18" 22cm runs 85-90gr bullets at 3150-3200 no psi. Old 22" barrel was 3350 top end.

 

[Axlrod]

22prc is likely only going to outpace a 22 creed by 150fps in a shorter barrel. Why go through all the trouble for that? My 18" 22cm runs 85-90gr bullets at 3150-3200 no psi. Old 22" barrel was 3350 top end.

No psi?? Not possible.
Peterson Cartridge has pressure test data through a universal receiver for the 22 Creedmoor using a 24" barrel. Their data shows an 80.5 grain bullet at 3223 FPS is 62,223
PSI. This is with a lighter bullet and 6" more barrel length than yours. 62,000 PSI is max for the parent cartridges- 6mm & 6.5 Creedmoor. So your load is most definitely over safe pressure levels. So the reason to go through "all the trouble" is to stay out of trouble.

https://www.petersoncartridge.com/media/1367/22-creedmoor-press-release.pdf

 

[khuber84]

No psi?? Not possible.
Peterson Cartridge has pressure test data through a universal receiver for the 22 Creedmoor using a 24" barrel. Their data shows an 80.5 grain bullet at 3223 FPS is 62,223
PSI. This is with a lighter bullet and 6" more barrel length than yours. 62,000 PSI is max for the parent cartridges- 6mm & 6.5 Creedmoor. So your load is most definitely over safe pressure levels. So the reason to go through "all the trouble" is to stay out of trouble.

https://www.petersoncartridge.com/media/1367/22-creedmoor-press-release.pdf

I guess I should say no apparent psi signs other than slightly flat primers, using rl26. A bat action and lapua brass(has more vol than Peterson) is hiding it all. The improved case geometry of the UM chamber does the same thing. If you think the 6um case topped off with N570 pushing 115s at 3350fps+ isn't north of 62k psi, well I'm sure it is too. I've had a few Sherman cartridges, 25 sst, 65 max, 7max, I know what those square walls and 40° shoulders do. The psi is there, you just don't see it till its VERY high. I mean my 22" 22gt will run 80s ar 3150 pretty easily with 36gr of power, no "apparent" psi signs. I'm all for seeing what the 22um will do! Barrel life will be short, but you don't have that as a concern.

 

[ZWA]

May need a new tread but tell us more about this 22-250. barrel twist, velocity, etc.

Shilen 26” 7.5 twist remage on a TL3
REM brass with rem 9 1/2 primers and reloader 22. PM me if you need anything else and sorry for late reply.

 

[Split toe]

What am I gaining over my 22 creed with this?

 

[Mike D Texas]

I think the 88 eldm or 90 atip will be tough to best. I know the 90s have a legit 307g7 bc to 1250y at 3100fps from a 7tw. 88s are near 0.280-285 from all I've read. I know the 88s expand reliably, however I've never put an atip on game.

Ohhhhh a 90 grain ATip sounds interesting.

My 7 twist 22-250AI with (now) a 25” barrel runs 90 grain Gold Dots at 3400.

Been shooting this one since 2014. Barrel has been set back twice.


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[Ibex]

Shilen 26” 7.5 twist remage on a TL3
REM brass with rem 9 1/2 primers and reloader 22. PM me if you need anything else and sorry for late reply.

Thank you

 

[ACHILLES]

22prc is likely only going to outpace a 22 creed by 150fps in a shorter barrel. Why go through all the trouble for that? My 18" 22cm runs 85-90gr bullets at 3150-3200 no psi. Old 22" barrel was 3350 top end.

I run 80gr elds at 3020fps right now in my 18” 22creed. 22prc is around 68gr case capacity same as a 22-284 which can run 77tmk at 3750 in a 26”. So it’s still going to out run it by 300fps at least.

 

[ACHILLES]

What am I gaining over my 22 creed with this?

Probably around 400fps with the heavys. May have to run solids though to keep from shedding jackets

 

[Sadler]

Who’s chambering 22PRC?

 

[ACHILLES]

I believe primal rights has a 22&6prc primal reamers (22prc 40*). I think Stratton customs has built some but not positive.

 

[khuber84]

I run 80gr elds at 3020fps right now in my 18” 22creed. 22prc is around 68gr case capacity same as a 22-284 which can run 77tmk at 3750 in a 26”. So it’s still going to out run it by 300fps at least, 400 at the pressures your running.

My 22" 22cm runs 77tmk at 3350-3450 relatively easily, no pressure signs with Rl23 or N555. 70gr absolute hammers at 3800fps with rl26. Once you get to bore diameter this small, going larger in case capacity doesn't net you the same percentage of velocity as it does in bigger caliber. You also have to start thinking about bullet performance, high velocity and external ballistics are all cool, but when bullet performance becomes inconsistent, you've crossed a thin line. This can be from jacket failure, or possibility of over expansion at impact due to velocity/rpm/bullet placement. I hope your 22um dreams pan out and it's all the rifle you want it to be. I'd personally be looking at the badlands bulldozer solids in a case like this, as bullet failure at high velocity/rpm will likely lead to inconsistency. The badlands are an expanding tipped mono. They work. I've killed a few deer with the 125gr 6.5mm and was impressed with their size of wound channel for the amount of penetration.

 

[Sadler]

I know Stratton chambers the primal but I’m not interested in that right now. I just want to neck down my 6.5 PRC brass and use my current dies. I’ll reach out to him and ask if he will do a regular 6 and 22 PRC

 

[Venatic]

Like most wildcats it’s been done quite a while back. Maybe some of this information Fred posted back then will be helpful.

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I had just shot my barrel out of my 22 Creedmoor back when he was playing with this and for a few seconds considered it but didn’t seem to fit my needs as I do run a lot a rounds each season shooting predators and deer hogs etc so went back with Creedmoor and I think it was a good decision after 3 barrels.

 

[ACHILLES]

There’s a guy on LRH running 4 or 5 22-284s with a variety twists with jacketed bullets and solids. Also has a 22 SAUM and 22wsm improved running solids.
Off memory I think Fred was able to run 75gr amax at 3900 fps in the 220 Redline but they shot best around 3700 in a 9 twist. A lot of good data out there.
The 22UM is a fire breather, I’m looking forward to the testing with jacketed bullets. Glad to see guys keeping it interesting and building lasers!

 

[ACHILLES]

22prc is likely only going to outpace a 22 creed by 150fps in a shorter barrel. Why go through all the trouble for that? My 18" 22cm runs 85-90gr bullets at 3150-3200 no psi. Old 22" barrel was 3350 top end.

My 22" 22cm runs 77tmk at 3350-3450 relatively easily, no pressure signs with Rl23 or N555. 70gr absolute hammers at 3800fps with rl26. Once you get to bore diameter this small, going larger in case capacity doesn't net you the same percentage of velocity as it does in bigger caliber. You also have to start thinking about bullet performance, high velocity and external ballistics are all cool, but when bullet performance becomes inconsistent, you've crossed a thin line. This can be from jacket failure, or possibility of over expansion at impact due to velocity/rpm/bullet placement. I hope your 22um dreams pan out and it's all the rifle you want it to be. I'd personally be looking at the badlands bulldozer solids in a case like this, as bullet failure at high velocity/rpm will likely lead to inconsistency. The badlands are an expanding tipped mono. They work. I've killed a few deer with the 125gr 6.5mm and was impressed with their size of wound channel for the amount of penetration.

I loaded for a 18” 22-250AI that shot 70gr bergers very well at 3425fps and showed no obvious pressure signs after putting 3 firings on a few pieces of lapua brass. But ended up loading it at 3250 just cuz.
You load a 22-284/22PRC on the top end like that and it puts 77tmks at 3850fps. Shorten that that to a 22” and your at 3650-3750. Still a 300fps gain over the creedmoor.

 

[Gstew1930]

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