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AR reloading question
#6006359
11/02/15 04:57 PM
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Joined: Nov 2011
Posts: 672
ltsheets
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Well I finally finished building my first AR. It has a varmint contour SS 1-8 twist 5.56 barrel on it. I built this rifle for shooting steel and predators/varmints. Should I just load up 55gr bullets or try and shoot some heavier bullets for better long range performance? I'd love to try the 75gr amax but worry Either the 1-8 isn't enough or that they'd be too long for the magazine? I'm open to any recommendations. Thanks.
Last edited by ltsheets; 11/02/15 04:57 PM.
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Re: AR reloading question
[Re: ltsheets]
#6006423
11/02/15 05:25 PM
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Joined: Mar 2012
Posts: 3,809
Cleric
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How long is the barrel? I think 1-8 can do 75 amax but you have to test. I would only shoot 55s if you want to save money. Otherwise 69smk 77smk or 75amax
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Re: AR reloading question
[Re: ltsheets]
#6006450
11/02/15 05:42 PM
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Joined: Sep 2006
Posts: 32,442
kmon11
junior
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junior
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In the past have loaded and shot 75gr V-Max in an AR with a 1:8 twist, they did fine except needed to load them a little long or the ogive would be in the case mouth. Loaded a little longer just to where they would work in the steel mags worked though. They were too long for a Pmag since the steel is thinner than the plastic could get away with a little longer COL. But they stabilized.
Also have a 22-243 with a 1:8 27 inch Hart barrel that have loaded down to velocities obtainable with the 223 and it stabilized the 75 V-Max and Nosler 80gr Custom Competition bullets at the reduced velocities.
Remember with a 1:7 twist a 223 can stabilize the 1.25 inch long 90gr Berger VLD bullets. For the Berger 75gr VLD they list optimal twist as 1:7.9 and min twist as 1:9
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
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Re: AR reloading question
[Re: ltsheets]
#6006459
11/02/15 05:47 PM
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Joined: Sep 2006
Posts: 32,442
kmon11
junior
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junior
Joined: Sep 2006
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Interesting read on loading the 223 from ShootingTimes 223 reloading article
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
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Re: AR reloading question
[Re: ltsheets]
#6006464
11/02/15 05:49 PM
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Joined: Sep 2009
Posts: 18,907
ChadTRG42
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The 75 A-max will stabilize fine out of an 8" twist. Like stated, the 75 A-max will seat deep into the case. I'd recommend the 75 BTHP. This bullet is near identical to the A-max, but has the shorter ogive to tip length, which will allow the bullet to seat further out in the case and still have a 2.250" COAL.
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Re: AR reloading question
[Re: Cleric]
#6006833
11/02/15 08:51 PM
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Joined: Nov 2011
Posts: 672
ltsheets
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I think its a 20" barrel. How long is the barrel? I think 1-8 can do 75 amax but you have to test. I would only shoot 55s if you want to save money. Otherwise 69smk 77smk or 75amax
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Re: AR reloading question
[Re: ltsheets]
#6006837
11/02/15 08:54 PM
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Joined: Nov 2011
Posts: 672
ltsheets
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Thanks guys. What velocities should I expect with the 69-75gr bullets?
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Re: AR reloading question
[Re: ltsheets]
#6006972
11/02/15 10:16 PM
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Joined: Apr 2013
Posts: 2,416
tenyearsgone
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My AR that has the 1:8 twist barrel shoots 75 grain BTHP's like a dream. I load them short enough to just barely clear the magazine. I've found AR Comp to work best for this bullet with my setup.
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Re: AR reloading question
[Re: ltsheets]
#6007764
11/03/15 04:20 AM
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Joined: Nov 2011
Posts: 672
ltsheets
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What's the powder of choice for the 175 BTHP?
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Re: AR reloading question
[Re: ltsheets]
#6007805
11/03/15 04:56 AM
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Joined: Sep 2006
Posts: 32,442
kmon11
junior
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junior
Joined: Sep 2006
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for the 75gr pills I like Varget or CFE223. Really like the CFE for the Swift Siroccos since it helps get rid if the fouling of the pure copper jacket.
lf the saying "Liar, Liar your pants on fire" were true Mainstream news might be fun to watch
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Re: AR reloading question
[Re: ltsheets]
#6007867
11/03/15 05:57 AM
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Joined: Apr 2013
Posts: 2,416
tenyearsgone
Veteran Tracker
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Veteran Tracker
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AR Comp, 8208 XBR, or CFE 223.
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