Starline .223 basic brass

HiBC · November 25, 2018, 12:17 PM

I ntice Starline offers a basic.cylindrical ,no taper ,no shoulder,no neck brass now.

I'm sure someone has invented an AR cartridge already and all I have to do is research,but a .357 ish cartridge can be done with this brass.
About .500 of bullet ogive can protrude.

I'm thinking a ballpark comparable cartridge is the .357 Maximum....just for visions.
The .223 based cartridge would be a little longer.And,the .357 Maximum has a Max SAAI pressure of 40,000 psi vs the .223 at 50,000 psi.

Per my Nosler book,in .357 Maximum,with 158 gr bullets,case capacity seems the limiting factor at about 1900+ fps and H-110 from a 10.5 in bbl

More interesting,to me,is a 180 gr partition handgun bullet that gets max pressure at 75 % case capacity with H-110/296. 1500 fps +. That means there would be room for more powder to get from 40,000 to 50,000 psi in the .223 based case. Also,going from a 10.5 in bbl to a 16 in bbl leads me to believe 2000 fps might be possible.with a 180. Certainly 1800 + Not quite a 35 Remington...but then,not so far behind.
Stock 223 magazines,bolt,etc.

IMO,the 180's would be a good hunting round,and for HD,the 158's at over 2000 fps would probably be effective manstoppers.

Cold,windy day.Something to think about. Actually

Since I assume this has been done,I'd be curious if someone is making barrels.I have an upper thats getting dusty.

FrankenMauser · November 25, 2018, 01:42 PM

.357 AR <- Barrel group buy.
AKA: ".358 Macho"
The buy is over, but it'll point you toward the reamer...

HiBC · November 25, 2018, 03:07 PM

Thank you! Seems like it can work out very well.

IMO,its a natural to go commercial.

November 25, 2018, 12:17 PM	#1
HiBC Senior Member Join Date: November 13, 2006 Posts: 8,286	Starline .223 basic brass I ntice Starline offers a basic.cylindrical ,no taper ,no shoulder,no neck brass now. I'm sure someone has invented an AR cartridge already and all I have to do is research,but a .357 ish cartridge can be done with this brass. About .500 of bullet ogive can protrude. I'm thinking a ballpark comparable cartridge is the .357 Maximum....just for visions. The .223 based cartridge would be a little longer.And,the .357 Maximum has a Max SAAI pressure of 40,000 psi vs the .223 at 50,000 psi. Per my Nosler book,in .357 Maximum,with 158 gr bullets,case capacity seems the limiting factor at about 1900+ fps and H-110 from a 10.5 in bbl More interesting,to me,is a 180 gr partition handgun bullet that gets max pressure at 75 % case capacity with H-110/296. 1500 fps +. That means there would be room for more powder to get from 40,000 to 50,000 psi in the .223 based case. Also,going from a 10.5 in bbl to a 16 in bbl leads me to believe 2000 fps might be possible.with a 180. Certainly 1800 + Not quite a 35 Remington...but then,not so far behind. Stock 223 magazines,bolt,etc. IMO,the 180's would be a good hunting round,and for HD,the 158's at over 2000 fps would probably be effective manstoppers. Cold,windy day.Something to think about. Actually Since I assume this has been done,I'd be curious if someone is making barrels.I have an upper thats getting dusty. Last edited by HiBC; November 25, 2018 at 12:47 PM.

November 25, 2018, 01:42 PM	#2
FrankenMauser Senior Member Join Date: August 25, 2008 Location: In the valley above the plain Posts: 13,424	.357 AR <- Barrel group buy. AKA: ".358 Macho" The buy is over, but it'll point you toward the reamer... __________________ Don't even try it. It's even worse than the internet would lead you to believe.

November 25, 2018, 03:07 PM	#3
HiBC Senior Member Join Date: November 13, 2006 Posts: 8,286	Thank you! Seems like it can work out very well. IMO,its a natural to go commercial.