load data

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  • Last Post 06 April 2015
heet posted this 05 April 2015

Does anyone have any load data for rcbs 22/55 fn bullet. 55 grns. Using imr 4320 any help would be appreciated. And also oal data.Thanks

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tturner53 posted this 05 April 2015

In what?

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heet posted this 05 April 2015

Ar 15

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Larry Gibson posted this 05 April 2015

Do you want it to function the action?

LMG

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

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onondaga posted this 05 April 2015

http://castbulletassoc.org/view_user.php?id=8653>heet

22.1 gr IMR 4320 is the START load from Hodgdon for a 55 gr jacketed bullet in .223 Rem.

That may be a little too hot for a cast bullet with accuracy, but it would certainly be safe to try. Don't go any lower than 5% below Start IMR4320 charge (20.9 gr) or you may have serious ignition problems.

The Lyman Cast bullet Manual #4 does not recommend IMR 4320 for any bullet weight in .223 Rem. but that does not mean it is unusable.

If your alloy is strong enough for the load level and your bullets fit well and are gas checked the IMR 4320 may work well at 20.9 - 22.1 grains in your AR15.

I shoot cast bullets in my AR15 with H4895 and AA2230 and it does well with a gas checked bullet cast in Lyman #2 alloy , tumble lubed/sized .225” and just below Start loads of H4895 or AA2230. The lightest charge that will function the action reliably is usually a good one for the AR15 and cast bullets.

Warning: alloy selection is very important for shooting cast in an AR15, Alloys that are too soft or too hard for the load level will shave or chip lead into the gas system and stop your rifle function. This is a serious concern and a big mess to clean out or replace parts.

Check your gas tube with a pipe cleaner after the first 10 shots, check for lead flakes. If you get lead flakes, your bullet alloy is either too hard or too soft for your load level, or your bullets are too small in diameter. Lyman #2 alloy or Hardball pistol alloy is usually best for the AR15 with gas checked cast bullets, both of those alloys are BHN15 hardness.

 The wrong alloy will trash your rifle. If you get flakes, STOP! and figure out why. If you keep shooting, your rifle will stop functioning shortly.

A good source for Certified Lyman #2 or Hardball:

http://www.zipmetals.com/Bullet-Casting-Metals_c_44.html>http://www.zipmetals.com/Bullet-Casting-Metalsc44.html

or

http://www.rotometals.com/Bullet-Casting-Alloys-s/5.htm>http://www.rotometals.com/Bullet-Casting-Alloys-s/5.htm

Gary

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358156hp posted this 05 April 2015

Ed Harris has a great article on cast in the AR-15 on his website. I'd go into details, but I couldn't put it any better than this.

http://www.hensleygibbs.com/edharris/articles/Cast%20In%20an%20AR.htm

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onondaga posted this 05 April 2015

Ed's tips are excellent and the alloy he recommends of half Linotype and half soft lead is nearly identical to Hardball pistol alloy at BHN 15.

Gary

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M. W. Curtess posted this 06 April 2015

Apples & watermelons, probably, but I have never forgottem the dire warnings about shooting CB's in SKS ( back in the late 1980's or early 1990's.) Since then, I have run hundreds- likely thousands-of CB's thru mine, all alloys harder than dead soft - and never the least problem. (in a way, I have been disappointed by this, because I expected to have to pay my dues by frequent cleaning of the gas system - and taking it apart has been pointless.) Ditto the AK47 - but then, they are 30 cal, which may just be more compatible with cast bullets?

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heet posted this 06 April 2015

Thanks everyone, i could not find anything on this bullet using imr4320. I did see where they were using 23 grns for 55 gr jbt, but i figured that might be a little hot. 

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John Alexander posted this 06 April 2015

M. W. Curtess wrote: Apples & watermelons, probably, but I have never forgottem the dire warnings about shooting CB's in SKS ( back in the late 1980's or early 1990's.) Since then, I have run hundreds- likely thousands-of CB's thru mine, all alloys harder than dead soft - and never the least problem. (in a way, I have been disappointed by this, because I expected to have to pay my dues by frequent cleaning of the gas system - and taking it apart has been pointless.) Ditto the AK47 - but then, they are 30 cal, which may just be more compatible with cast bullets? Well, it could indeed be a case of apples & watermelons.  There are a lot of somewhat different gas operated guns. However, my money would bet that this is just another bit of sage advice based more on theory that it might happen than on facts showing that it is likely.

Other fields have similar convention wisdom rules offered in good faith by the serious people as if passed down on gold tables from on high.  But the cast bullet clan seems to be particularly susceptible to anybody with a straight face claiming you have to to this or that or bad things will happen.

We have more than enough opinions but a shortage of opinions that have been actually tested at the range.

This one may indeed be the exceptional apple and watermelon case that proves the rule. But the expression “exception that proves the rule” is itself an illogical expression. 

The above opinion isn't aimed at any one rule or warning and it is not meant to offend anyone (although I realize that is a possibility.)  But it is my opinion, based on the failure of several other sacred rules to be provable by actual testing, and I believe it should be said once in a while. I bit more skepticism and a bit more testing would help us learn to shoot better. John

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