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75 A-Max in a 9 Twist .223

 
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  #1  
Old 08-21-2011, 10:45 PM
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Join Date: Apr 2006
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75 A-Max in a 9 Twist .223

I'd really like to get the Hornady 75 A-Max to shoot well in my 9 twist 223 (unaltered Rem 700 XCR, 26" bbl) but accuracy is always just lagging behind the 68 gr Hornady BTHP. I know I'm pushing my luck with a 9 twist and should be using a faster twist, but before I give up on that bullet I thought I'd ask here and see if anyone knows of any tricks to get it shooting well in a 9 twist barrel. Drive it fast? Drive it slow? Jam it? etc.
Thanks
triggerpress
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  #2  
Old 08-22-2011, 05:16 AM
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Location: Illinios
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Re: 75 A-Max in a 9 Twist .223

I talked to Hornady and they said the 75 A MAX requires an 8 twist. I have a new FN TSR and wanted to try them in it. I tried the 68 BTHP but get better groups with the Sierra 69 BTHP.
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  #3  
Old 08-22-2011, 08:12 PM
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Re: 75 A-Max in a 9 Twist .223

i shoot the 75 gr.a-max with 24.0gr. of h4895 in my 9 twist and the hornady hpbt match same load .625" groups. savage 24"barrel. around 3000fps.MARK25-06
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  #4  
Old 08-22-2011, 11:25 PM
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Re: 75 A-Max in a 9 Twist .223

Haven't tried the A-max, but the 75gr BTHP shoots great out of my 1:9 Savage 12FV (26" barrel) and Bushmaster M4 (16").
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  #5  
Old 08-23-2011, 01:00 AM
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Join Date: Jun 2006
Location: Memphis, TN. Soon to be Casper, WY.
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Re: 75 A-Max in a 9 Twist .223

This what the 75VMax did in my rifle during load testing. I used the new AR Comp powder from Alliant and Winchester SRP's in Federal and LC cases. There is also a 75g BTHP group on this target. Both were shot using 7 rounds that were varied by 0.2 grains so all the powder charges are different. These were shot for pressure testing and grouped just to see what happened at 100y. All groups were shot in my RRA Varmint AR15. This barrel has a 1 in 8 twist.

Both of these bullets have a great deal of potential... Next up is to try at long range and see what happens.

__________________

Last edited by Stormrider; 08-29-2011 at 12:00 PM. Reason: Better picture.
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  #6  
Old 08-23-2011, 09:03 AM
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Re: 75 A-Max in a 9 Twist .223

My TSR has a 20" barrel. With the 60 V-Max they run out of gas after 400 yds and the 69 hpbt at 600. I'm using Varget with the 60 V and H335 with 69 hp
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  #7  
Old 08-24-2011, 05:07 AM
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Join Date: Aug 2008
Location: wanganui nz
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Re: 75 A-Max in a 9 Twist .223

my sps tactical shoots them well.
26.4 gr varget with a 15-30 thou jamb.
i cant seem to get them to work if they are off the lands or at a milder charge
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