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80gr. Sierra MK for .224

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Unread 01-21-2004, 05:43 AM
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Join Date: Dec 2003
Location: Utah
Posts: 70
80gr. Sierra MK for .224

I was wondering does anyone have load information, specifically powder charges and muzzle velocity, for a .223 using the 80gr. SMK? I have a Howa chambered for .223 but it's at my 'smiths getting a new tube and a rechamber to .223 AI. [img]images/icons/grin.gif[/img]
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Unread 01-21-2004, 10:44 AM
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Re: 80gr. Sierra MK for .224

would look in your sierra manual would be in there.... couldnt tell you any off hand, will take a look if i can find it.
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Unread 01-21-2004, 04:20 PM
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Join Date: Jan 2002
Location: Wenatchee, WA
Posts: 806
Re: 80gr. Sierra MK for .224

There is a butt-load of data out there for the .223 w/ 80gr bullets, mostly for AR's though. The trick is piecing together the data in a useful fashion, i.e. what case were they using, what primer, what powder, how much, what velocity, moly or naked, OAL, etc. And then half of the data (or more) doesn't include chrono data.

Search the forums at:
Florida HighPower
AR-15.com Competitive Shooting & the Accurate AR
AR-15.com Reloading

Also, there is some good info at:

from a prominent AR gunsmith.

The new Sierra loading manual splits up the loading data btwn gas guns and bolt guns, since the bolt guns are a little less sensitive to pressures.

Lots of data out there, but it'll take a fair amount of work to sift thru it all. And if you are using an AI (from the sounds of it), well, you'll be largely on your own [img]images/icons/wink.gif[/img] Enjoy!


[ 01-21-2004: Message edited by: milanuk ]

[ 01-21-2004: Message edited by: milanuk ]
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Unread 03-14-2010, 10:12 AM
Bronze Member
Join Date: Jan 2008
Location: half way between Buffalo,NY and Rochester,NY
Posts: 60
Re: 80gr. Sierra MK for .224

you didn't say what twist you have,so I will tell you that you need a 1/8 or a 1/9 twist to shoot the 70 to 80 gr bullets. I shoot out of my AR 15 80 gr. SMK with Varget 24 grs. You can use varget,vihtavouri N140,AA-2520,reloader 15,win 748,and BLC2 to name some.
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