I use 18 grains of AA2200 with an RCBS 22-55. Cycles fine and groups into 3.5" at 100 yards. Nothing to write home about but cheap plinking. I wouldn't hesitate to use it on Varmints.
I use 18 grains of AA2200 with an RCBS 22-55. Cycles fine and groups into 3.5" at 100 yards. Nothing to write home about but cheap plinking. I wouldn't hesitate to use it on Varmints.
Is this a real post or some kind of tongue in cheek joke?
Exactly how does a gun powder "impart RPMs"????
RPM's are a result of velocity and twist rate. It doesn't matter what powder you use.
Plus I'd be willing to bet that a "AR" with a pistol length gas system and the correct chambering (that's caliber if you're a little slow) can be persuaded to run on Unique.
Motor
Motor
Jmorts post was a cheap reference to the over stabilized accuracy failure that can result from a twist to fast for length of bullet and velocity .
My research has given me a number 13-18,000 psi at the gas port for proper action function of the AR15 action . That can be altered some with buffers and springing and maybe even the bolt carriers . I doubt that an accurate Unique load would cycle reliably in short of a purpose complete SBR or pistol .
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"Plus I'd be willing to bet that a "AR" with a pistol length gas system and the correct chambering (that's caliber if you're a little slow) can be persuaded to run on Unique."
It it would be nice to run an AR on Unique. I remain a doubter, but would love to be wrong. Hopefully, in the fullness of time it will be possible.
Guys. What diameter boolit size die do you recommend for this project? I have a .224" but don't think it's large enough. I have the means to lap it larger but to what size?
Motor
I use 224 with 10% Linotype and carnuba red. Aluminum or copper checks. With my bolt oiled well, they feed flawlessly and as fast as I can pull the trigger
I opened it up to about .2255" Gonna load some test rounds this evening.
Motor
Make sure the neck of the finished round is not too wide otherwise you will have chambering issues
And oil your bolt well also. When I started making cast rounds for my AR, i had ejection issues and thought it was the load itself. A jacketed factory load often has enough pressure to cycle a dry bolt. Not so with cast loads. It helps tremendously to have the bolt generously oiled when working with cast AR loads. The wives tale about clogging your gas ports with lead is just that. The pressure needed to blow the bolt back will certainly blow the barrel gas ports clear. Have fun
Ok. I'll run her wet with CLP. It's a new upper too so running wet was never a question.
I'll be using powder coated bullets with aluminum gas checks. I was going to go without the checks and I will still test some without but my brother bought a thousand of them so I figure why not......
Motor
I tried 15 and 16gr RL-7. Both ran the rifle with it well lubed with CLP. Groups at 50 yards were about 4.5"
Then I tried 18 and 19gr of H-4895. The 18gr load shot well enough for me to keep working. 8 of 10 are in a group less than 2" which is smaller than the red dot optic being used.
This was with gas check. Without the gas checks the groups are about 2 feet. There is no evidence of bullet or PC failure they just simply don't shoot accurately.
Motor
Kinda on the same topic, I finally got the Arsenal .223 "Elvis" running in a AR. It's a slick side and about 62ish grains. Loaded to mag length and 21.0 grains of 2230 and runs like a dream. I had problems with the lee 55, to short of a bullet to want to load reliably from the magazine. Some have done it, I wasn't gonna spend the time messing with it. Also the "Elvis" has a lot of bearing surface.
I didn't have any trouble with feeding. I hate to modify the 6 cavity mould for an experiment but have to think if the gas check bore was moved making it a .225" flat base bullet that it would work just fine.
I may buy a 2 cavity and try it.
Motor
I had problem 20" 1:8 twist ar15 all test group was 20" to 1 feet. Whit cast 62gr pc bullet.
Thos gc is reguired on 223?
You are on the right track. The GC does a few things. One of the biggest things is:
A imperfect base on a cast boolit will effect accuracy as the boolit leaves the muzzle, much like a imperfect crown on the barrel.
while not nearly as important for pistol type shooting...Rifle shooting generally demands much more accuracy, So little things add up.
Also the "Gas Check", does as the name implies, it will better seal the bore as the boolit is launched than a boolit without a gas check...Again, with Rifles, which typically have higher pressures, a GC is more required than pistol loads.
A GC does some other magic too, so much so, that we don't even know?
Last edited by JonB_in_Glencoe; 04-07-2017 at 09:06 PM.
~~~~~~~~~~~~~~
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BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |