22 Caliber in the AR-15

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  • Last Post 2 weeks ago
GP Idaho posted this 2 weeks ago

Thanks to Joe B., Ed H. and Bob E. I now have on hand eight different bullet configurations in 22 caliber. Along with my moulds, Joe's moulds and samples sent by all it's quite a variety. I recently picked up a new Ruger 556 AR. I needed the lower but now I have an extra 223 upper I can dedicate to cast. Somehow of all eight bullets only the 80gr. NOE SP can't be used and keep the gas check in the neck. Even with the bullets powder coated all the others will chamber at a COL of 2.200 to 2.250. Now, I guess it's time to see if I can get my cast bullet loads to work in an AR. I'm going to start with the NOE 60gr. RN, the Saeco clone. Opinions on powder selection welcome. Gp

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David Reiss CBA Membership Director posted this 2 weeks ago

gp,

PM me your list of CB molds. I have 10 of my own and have been experimenting with my AR in .223. 

David Reiss - NRA Life Member & PSC Range Member Retired Police Firearms Instructor/Armorer
-Services: Wars Fought, Uprisings Quelled, Bars Emptied, Revolutions Started, Tigers Tamed, Assassinations Plotted, Women Seduced, Governments Run, Gun Appraisals, Lost Treasure Found.
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OU812 posted this 2 weeks ago

I think a 1/9 twist barrel would work good in the AR. Do not exclude the harder to find 1/12 twist...

 

 

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GP Idaho posted this 2 weeks ago

OUB12; Thanks for the chart.  To be truthful, not a lot of thought was given as to what twist this carbine had. It's an eight twist by the way. I was tired of swapping uppers on my Rock River and went shopping for lowers. As it turned out, this Ruger carbine, complete was only about $80 more than the lower I was looking at and my thought was to sell the upper.. After some thought I decided to give the .556 cartridge a try and am once again back to swapping uppers.  I've been reading a lot of the older posts here on the forum and have ten rounds each with five different powders under the Saeco RN 60gr. GC bullet. Just have to make the range trip and see if I'm close with any of the loads. Will let you all know the charges if anything works as planned. Gp

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45 2.1 posted this 2 weeks ago

You would do better with a cast bullet that fits your barrels throat well than pay attention to RPM theory. Under size bullets contribute to that idea. The real problem is barrels with minimal land height made for jacketed bullets. I size to 0.227" with the MP 22 Nato..... That bullet has shot many 1 to 1.25 MOA groups out of various DPMS, Stag and Armalite AR's. My load gives a little over 2,400 fps even out of carbine length barrels.

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Larry Gibson posted this 2 weeks ago

Many get frustrated using cast bullets in faster twist ARs.  If you find yourself in the frustrated category then pay attention to the chart OU812 posted.  A medium powder such as 4895 with a Dacron filler will probably work best if you want functional reliability.  Best accuracy is going to be at functional reliability.

 

LMG

Concealment is not cover.........

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GP Idaho posted this 2 weeks ago

First range tests today in the new Ruger556.  I loaded five different powders under a NOE 60gr. RN powder coated. Limited success but at least some. All loads but one short stroked. The load working the action and holding the bolt open on the last shot was 19.5gr. of H-4895. It was raining today so I didn't chronograph the loads Now that I know the 4895 load works at this speed, I'll drop the load down .5 gr. and check for function. Gp

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