Would you please post the case capacities of the three cartridges.
Thank you.
22arc
- Thread starter bobcat93
- Start date
Thank you.
I don't remember specific h2o numbers but in order from least to most is ARC, BR and Dasher.
A 22 ARC has the same headspace and shoulder angle as a Grendel, so it is in fact a 22 Grendel. The 6 ARC is pretty much right between a PPC and a Grendel and all share the ppc case head diameter. So, a 6 ARC is a ppc=.030 and a Grendel is a ppc + .070, and again, a 22 ARC is a full length 22ppc plus .070, same as a Grendel.
All BR cases are bigger in diameter and the dasher is a 40°and blown forward vs a straight 6br
I've posted 6 and 30 grendel h2o capacities on here before and probably br as well if you can find the posts by myself or others. The data is on here, though.
post 29 of this thread mentions 22 LBC(Grendel/ARC) capacity...fwiw
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I've seen no difference in thickness nor how they handle pressure between the common Lapua 220 Russian vs 6.5 Grendel Lapua brass. Both handle really high pressures very well as compared to anything else I've found. I've blown 220r brass out to grendel length and cam to the same conclusion that way as well. Both are excellent brass and will be hard to beat at handling pressure.
Your bottom pic is almost certainly a chamber with too much unsupported case, particulary on the case on the right. It can be from a heavy chamfer at the chamber opening..pretty common actually. No brass is intended to hold 52000psi...and way more in bolt guns..unsupported. If it was properly supported, it wouldn't have bulged.
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I was looking for that information a few months ago, and I could have sworn that the information I dug up on line indicated that the 22BR was around 35gr of H20, BRA and ARC were around 38gr. I think I ended up finding information on the 6mm cartridges and using that to estimate what their 22 counterparts would be. I don't think I was looking for the Dasher at the time though. Pretty sure I was confusing it with the BRA when I posted earlier. Based on what I can find on line (including GLShooter's info above) it looks like the 22 ARC and BR are identical for all practical purposes. My thought a few months ago was that the ARC brass would likely be more available (more companies making it), and therefor less expensive. So far, that doesn't really seem to be playing out but time will tell.
Honestly, I really don't understand why there's not a resource out there that lists the case capacities for most of these cartridges. I know that case capacity is not the deciding factor in a cartridges performance, but it does provide a quick and easy reference point. Obviously it would be impossible to list the capacity for EVERY wildcat ever made, but PPC and BR variants are all popular wildcats.
One advantage of the ARC in a gas gun that I hadn't thought of previously. I remember that guys used to open up the bolt face on their AR and/or turn down the case heads slightly on BR brass so they could run the BR cases in their Match rifles. The ARC case should eliminate that need. Then again, Armalite came out with a WSSM bolt face for the AR15 not long after that, so the diameter of the bolt face should not have been an issue for about 2 decades now.
Olympic Arms once sold AR15's that ran a magnum-sized bolt for a couple WSSM cartridges and AR15 Performance once sold 308-sized bolts for its own 270 MSR wildcat uppers (based on 6 Dasher brass). IIRC, both of those required custom barrel extensions to deal with the larger outer diameter of the bolt. Colt had an oversized bolt on its CK-901 made for Yemen's army.
It seems that the general market is determined to stick with the standard 5.56-OD bolts to keep costs down. Dedicated Technologies still sells the uppers for its WSSM AR15's, but they are pricy.
It seems that the general market is determined to stick with the standard 5.56-OD bolts to keep costs down. Dedicated Technologies still sells the uppers for its WSSM AR15's, but they are pricy.
My Hornady fired 22ARC brass holds right at 35.4 grains of water and my Hornady necked and fired 6.5 Grendel to 22ARC brass holds 34.8 grains of water. The neck thickness of the 6.5 cases is thicker than the 22ARC by 0.003 total. The seated necks are 0.252 for the Grendel brass and 0.249 for the 22ARC brass.
RegionRat
Gold $$ Contributor
https://bulletin.accurateshooter.com/tag/22-dasher/#:~:text=As you can see it,the norm at 4200 fps.
Some tidbits in the above article for nightstand reading.
Down low in the page it says the 22 Dasher holds 41 grains of H2O.
Some tidbits in the above article for nightstand reading.
Down low in the page it says the 22 Dasher holds 41 grains of H2O.
padom
Gold $$ Contributor
My Lapua 22BR brass holds 38.50gr H20 for comparison
Oh boy!, i forgot i had asked
From what i can see the weak point is the poor little ar-15 bolt head. What a drag..
Toss it in a boltgun..and well ill take the 22ppc.
Once i started reading how the ar-15 bolt face is opened up for the grendal case the wind went out of my sale..then not long after i started seeing blown bolt photos on google images from folks pushing it a little to hot..i kind of have a very, very bad tendency to do that so i dont think its for me.
It sure is a sexy little case..i do love the looks of it.
From what i can see the weak point is the poor little ar-15 bolt head. What a drag..
Toss it in a boltgun..and well ill take the 22ppc.
Once i started reading how the ar-15 bolt face is opened up for the grendal case the wind went out of my sale..then not long after i started seeing blown bolt photos on google images from folks pushing it a little to hot..i kind of have a very, very bad tendency to do that so i dont think its for me.
It sure is a sexy little case..i do love the looks of it.
I think the bolt face is going to be what keeps it from becoming popular. Shame.
If you neck size 6arc brass you can't use that brass as 22ARC is 1.510 to 1.525 long while 6arc brass is trim to length is 1.480 to 1.490
Also the hornady sizing dies gives very little neck tension with arc22 loaded ammo. It seems this could have worked better if hornady had spent more time engineering these calibers! I have both 6 arc and 22arc
Also the hornady sizing dies gives very little neck tension with arc22 loaded ammo. It seems this could have worked better if hornady had spent more time engineering these calibers! I have both 6 arc and 22arc
I made a mistake here the trim to length for a 6arc case is 1.480"
What length does the 6MM ARC grow too when you size it down to 22 ARC caliber? Have you tried it?
I had no issues necking down Hornady 6ARC brass and running it in my ruger gen2 22arc. The necked down 6ARC case oal came out .002” shorter than fired Hornady 22arc brass. My 80eldm load was jammed so I wasn’t worried about strechting case heads. Granted I just necked down a few pcs to shoot groups to see if it would work.
Since you're necking down anyway, I'd suggest partial neck sizing to create a false shoulder vs jamming. Just my 2 cents though.
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