2nd upper

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2nd upper

Postby bushmeister » Sat Nov 07, 2009 8:48 pm

I've really been enjoying my 450 :mrgreen: , and I've been considering a 2nd upper for the off season. I thought a 223 would be great b/c it would offer an affordable plinking round, as well as good varmint/long range potential. It would seem a .223 should fit the bill. Then I uncover that if I buy a 5.56(higher pressure), it will shoot .223 as well as 5.56, but not the other way around. through more hours wasted I determine certain manufacturers chamber in 5.56 only, and others in .223 only. Then you look at ammo, and most of it is labeled as .223/5.56? Anybody have any suggested links on where to find facts on this, or suggestions based on real experience?
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Re: 2nd upper

Postby thatguy » Sat Nov 07, 2009 10:04 pm

You are correct 5.56 can shoot .223 but not the other way around..

I believe most major mfg's (bushmaster, rra, colt, dpms) only chamber for 5.56.. There are a few companies that chamber in other calibers though..

You may even want to consider a 7.62x39 (russian 308 - same as AK) - ammo is very cheap compared to 5.56 and it can be used for varminting I believe..

Even cheaper than 5.56/223/7.72x39 to shoot would be a .22 dedicated upper (since a conversion wont shoot very well out of a .45 barrel LOL)..

good luck

brian
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Re: 2nd upper

Postby 2zero6 » Sun Nov 08, 2009 11:53 pm

Also dont forget if you want to shoot the 77-grain Black Hills Mk 262 Mod 1 Open Tip Match ammunition you should have a
1-7 twist to stabalize those bad boys properly. I have been using a 1-9 twist with 55 and 62 grainers.
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Re: 2nd upper

Postby BD1 » Mon Nov 09, 2009 7:34 am

I've had real good success with both the Nosler 77 grainers and the SMK 77's out of my 1-8 twist as well.
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Re: 2nd upper

Postby bushmeister » Mon Nov 09, 2009 8:02 am

So how does the 1-8 do for the lower grainers?
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Re: 2nd upper

Postby BD1 » Mon Nov 09, 2009 12:04 pm

The lightest bullets I use are the Hornady 55 grain Vmax. They do just fine.
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Re: 2nd upper

Postby 2zero6 » Mon Nov 09, 2009 8:15 pm

I love to usse the Varmint grenades so I am keeping the 1-9 but intend to put an 14.5" 1-7 barrel on my extra stripped upper when I build it. I have heard a few people say they were throwing the 77 grainers through their 1-9 with only occasional tumble but that is forum conversations so take it as a grain of salt.
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Re: 2nd upper

Postby the_mad_rshn » Mon Jan 25, 2010 8:57 pm

I just built a .223 with a 20" SS DPMS in 1-8" twist, pre-ban. I also installed the standard A-2 forearm on it so it looks more like a mil-spec rifle. What a shooter!!! The cheapest UMC ammo gave me 2" group with 15 out of 20 shots (5 were flyers) at 100 yards using open sites. WOW. I could not believe my eyes.
I bought a bunch of 55 gr. bullets, but I am planning also to use the heavier stuff to see how it shoots.
Cheers,
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