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#6006359 - 11/02/15 10:57 AM AR reloading question
ltsheets Offline
Bird Dog

Registered: 11/12/11
Posts: 497
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.


Edited by ltsheets (11/02/15 10:57 AM)

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#6006423 - 11/02/15 11:25 AM Re: AR reloading question [Re: ltsheets]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 2579
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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#6006450 - 11/02/15 11:42 AM Re: AR reloading question [Re: ltsheets]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 20287
Loc: Texas
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
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#6006459 - 11/02/15 11:47 AM Re: AR reloading question [Re: ltsheets]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 20287
Loc: Texas
Interesting read on loading the 223 from ShootingTimes

223 reloading article
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#6006464 - 11/02/15 11:49 AM Re: AR reloading question [Re: ltsheets]
ChadTRG42 Online   happy
THF Trophy Hunter

Registered: 09/16/09
Posts: 9401
Loc: Lewisville, TX
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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#6006833 - 11/02/15 02:51 PM Re: AR reloading question [Re: Cleric]
ltsheets Offline
Bird Dog

Registered: 11/12/11
Posts: 497
I think its a 20" barrel.

Originally Posted By: Cleric
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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#6006837 - 11/02/15 02:54 PM Re: AR reloading question [Re: ltsheets]
ltsheets Offline
Bird Dog

Registered: 11/12/11
Posts: 497
Thanks guys. What velocities should I expect with the 69-75gr bullets?

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#6006972 - 11/02/15 04:16 PM Re: AR reloading question [Re: ltsheets]
tenyearsgone Offline
Pro Tracker

Registered: 04/21/13
Posts: 1213
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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#6007764 - 11/02/15 10:20 PM Re: AR reloading question [Re: ltsheets]
ltsheets Offline
Bird Dog

Registered: 11/12/11
Posts: 497
What's the powder of choice for the 175 BTHP?

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#6007805 - 11/02/15 10:56 PM Re: AR reloading question [Re: ltsheets]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 20287
Loc: Texas
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.
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#6007867 - 11/02/15 11:57 PM Re: AR reloading question [Re: ltsheets]
tenyearsgone Offline
Pro Tracker

Registered: 04/21/13
Posts: 1213
AR Comp, 8208 XBR, or CFE 223.

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